Local HVAC Services In Ownesboro, KY | AC & Heating Repair
24/7 Emergency Service

HVAC emergencies happen when you least expect them. Contact the professionals at A+ Derr to take care of your issue. We have the necessary skills and tools to fix your system so you can safely use it once again. Call our team at 833-232-4328 to get emergency HVAC services in Louisville, KY, Evansville, IN, or the surrounding areas.

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Expert HVAC Service in Owensboro, KY

With the rapidly changing weather, you rely on your HVAC system to keep your home comfortable. If your HVAC system malfunctions, your home will quickly become uncomfortable. That’s where the team at A+ Derr Heating & Cooling steps in. Our team has serviced Kentuckiana-area homes for over 45 years.

To get reliable HVAC service in Kentuckiana, call 833-232-4328.

Dependable Air Conditioning

The sweltering heat is enough to drive anyone inside your home for comfort. However, if your AC goes out during a heat wave, you lose your comfort and put yourself at risk for health issues. This is why A+ Derr offers a comprehensive set of AC services.

Our AC services include the following:

  • Air conditioning repair: If you’ve noticed a decline in performance or strange noises in your system, it’s time to schedule a repair appointment.
  • Air conditioning replacement and installation: Our team can assist in the replacement and installation process if your old system has given out or you’re looking to upgrade.
  • Air conditioning maintenance: To get the most out of your AC unit, you need to conduct annual maintenance. One maintenance appointment can go a long way in extending the life span of your AC unit.

On top of central AC units, our team also services ductless mini-split systems. The ductless mini-split is an excellent alternative to a central AC unit as it can work as a heating and cooling system.

Top-Rated Heating

Just like the cold snaps in Owensboro can be brutal. When the cold weather hits, you want to be able to relax in your cozy home. Our heating services include the following:

  • Heating repair: Leaking systems or higher energy usage indicate that your heating system needs a repair appointment.
  • Heating maintenance: To ensure that your heating system runs efficiently year-round, scheduling an annual maintenance appointment is the best solution.
  • Heating installation and replacement: As a Lennox Premier Dealer, you can trust our team to handle installation and replacement appointments with high quality.

Our heating services apply to a variety of systems. Specifically, our team has heat pump and furnace services to help as many Owensboro residents as possible. Don’t let the cold take over your Owensboro home. Find the time for A+ Derr to repair or replace your heating system by calling 833-232-4328. 

Indoor Air Quality Solutions

One of the most important parts of HVAC service is the indoor air quality section. Our indoor air quality services are designed to keep the air in your home clean and your health in good standing with various services, including duct cleaning, air purifiers, and humidity control.Interested in how indoor air quality solutions can improve your Owensboro home? Call 833-232-4328 to schedule an appointment with A+ Derr.

Why Choose A+ Derr?

Dating back to 1975, our team has worked hard to provide every customer with a great experience when using A+ Derr Heating & Cooling. Along with our glowing reviews, we have financing options to take the stress out of the HVAC service process.To schedule HVAC services for your Owensboro, KY, home, call 833-232-4328.

HVAC FAQs

Why is my AC running but not cooling?

It is a clear sign that a part in the AC unit has broken. One common issue is a broken or clogged condenser coil.

How long do furnaces last?

Furnaces are built to last, as you can expect to get 15 to 20 years out of your furnace before signs of aging show. Annual maintenance can extend the life span of your system.

Recent Jobs and Reviews in Owensboro, KY

Job Locations and Reviews

Completed scheduled air conditioning maintenance inspection per customer request to examine HVAC equipment located in closet space. Performed comprehensive AC tune-up service including visual inspection of system components, verified proper operation of all mechanical and electrical elements, and documented equipment condition through photographic records. No issues or deficiencies identified during maintenance visit; system operating within normal parameters.
Completed scheduled air conditioning maintenance inspection per customer request to examine HVAC equipment located in closet space. Performed comprehensive AC tune-up service including visual inspection of system components, verified proper operation of all mechanical and electrical elements, and documented equipment condition through photographic records. No issues or deficiencies identified during maintenance visit; system operating within normal parameters.
Francis I.
Francis I. Checked in
Completed scheduled air conditioning maintenance inspection per customer request to examine HVAC equipment located in closet space. Performed comprehensive AC tune-up service including visual inspection of system components, verified proper operation of all mechanical and electrical elements, and documented equipment condition through photographic records. No issues or deficiencies identified during maintenance visit; system operating within normal parameters.
Owensboro, KY 42303
# HVAC Install - Complete System

Successfully installed a complete 2-ton Lennox 16 SEER heat pump system with matching air handler. The installation included mounting and connecting the outdoor heat pump unit and indoor air handler, establishing proper refrigerant lines, and completing all electrical connections at the breaker panel. 

Performed comprehensive system commissioning using a Fieldpiece SMAN manifold gauge to verify refrigerant charge, pressures, and system temperatures, ensuring optimal performance parameters were achieved. All electrical connections were properly terminated with appropriate wire nuts and circuit protection installed per manufacturer specifications and local electrical codes. System was tested for proper operation in both heating and cooling modes, with all readings confirming the unit is functioning within factory specifications.
# HVAC Install - Complete System

Successfully installed a complete 2-ton Lennox 16 SEER heat pump system with matching air handler. The installation included mounting and connecting the outdoor heat pump unit and indoor air handler, establishing proper refrigerant lines, and completing all electrical connections at the breaker panel. 

Performed comprehensive system commissioning using a Fieldpiece SMAN manifold gauge to verify refrigerant charge, pressures, and system temperatures, ensuring optimal performance parameters were achieved. All electrical connections were properly terminated with appropriate wire nuts and circuit protection installed per manufacturer specifications and local electrical codes. System was tested for proper operation in both heating and cooling modes, with all readings confirming the unit is functioning within factory specifications.
Adam M.
Adam M. Checked in
# HVAC Install - Complete System Successfully installed a complete 2-ton Lennox 16 SEER heat pump system with matching air handler. The installation included mounting and connecting the outdoor heat pump unit and indoor air handler, establishing proper refrigerant lines, and completing all electrical connections at the breaker panel. Performed comprehensive system commissioning using a Fieldpiece SMAN manifold gauge to verify refrigerant charge, pressures, and system temperatures, ensuring optimal performance parameters were achieved. All electrical connections were properly terminated with appropriate wire nuts and circuit protection installed per manufacturer specifications and local electrical codes. System was tested for proper operation in both heating and cooling modes, with all readings confirming the unit is functioning within factory specifications.
Owensboro, KY 42303
Completed annual platinum level maintenance on a single HVAC system with an Aprilaire Model 2200 media air cleaner. Performed comprehensive system inspection, verified proper operation of all components, and documented equipment condition with photographs. System found to be operating within normal parameters with no immediate service concerns identified.
Completed annual platinum level maintenance on a single HVAC system with an Aprilaire Model 2200 media air cleaner. Performed comprehensive system inspection, verified proper operation of all components, and documented equipment condition with photographs. System found to be operating within normal parameters with no immediate service concerns identified.
Tyler C.
Tyler C. Checked in
Completed annual platinum level maintenance on a single HVAC system with an Aprilaire Model 2200 media air cleaner. Performed comprehensive system inspection, verified proper operation of all components, and documented equipment condition with photographs. System found to be operating within normal parameters with no immediate service concerns identified.
Owensboro, KY 42303
Completed annual Platinum Level maintenance on a single HVAC system installed in April 2026. Performed comprehensive inspection of evaporator coil, noting accumulated dust and residue on aluminum fins, and examined control board assembly including motor control circuitry and all wire connections. Verified proper operation of all electrical components, checked refrigerant levels, and replaced home air filter. All system components found to be functioning within normal parameters. Unit operating efficiently with no immediate repairs required.
Completed annual Platinum Level maintenance on a single HVAC system installed in April 2026. Performed comprehensive inspection of evaporator coil, noting accumulated dust and residue on aluminum fins, and examined control board assembly including motor control circuitry and all wire connections. Verified proper operation of all electrical components, checked refrigerant levels, and replaced home air filter. All system components found to be functioning within normal parameters. Unit operating efficiently with no immediate repairs required.
Brent D.
Brent D. Checked in
Completed annual Platinum Level maintenance on a single HVAC system installed in April 2026. Performed comprehensive inspection of evaporator coil, noting accumulated dust and residue on aluminum fins, and examined control board assembly including motor control circuitry and all wire connections. Verified proper operation of all electrical components, checked refrigerant levels, and replaced home air filter. All system components found to be functioning within normal parameters. Unit operating efficiently with no immediate repairs required.
Owensboro, KY 42301
Completed installation of a 50-gallon State brand residential water heater in utility closet alongside existing Bryant HVAC furnace unit. Connected copper supply lines, gas piping, pressure relief valve, and flexible metal venting, ensuring all connections meet code requirements and manufacturer specifications for safe operation.
Completed installation of a 50-gallon State brand residential water heater in utility closet alongside existing Bryant HVAC furnace unit. Connected copper supply lines, gas piping, pressure relief valve, and flexible metal venting, ensuring all connections meet code requirements and manufacturer specifications for safe operation.
Isaac G.
Isaac G. Checked in
Completed installation of a 50-gallon State brand residential water heater in utility closet alongside existing Bryant HVAC furnace unit. Connected copper supply lines, gas piping, pressure relief valve, and flexible metal venting, ensuring all connections meet code requirements and manufacturer specifications for safe operation.
Owensboro, KY 42301
Completed installation of electrical transfer switch system under permit 20261788. Installed new meter socket panel and transfer switch panel on exterior wall with proper conduit runs and weatherhead connections. Wired internal transfer switch components including circuit breakers, control relays, and associated branch circuits with appropriate color-coded conductors and proper terminations. All electrical connections were secured, panels were properly grounded, and installation was completed in accordance with NEC requirements and local code specifications.
Completed installation of electrical transfer switch system under permit 20261788. Installed new meter socket panel and transfer switch panel on exterior wall with proper conduit runs and weatherhead connections. Wired internal transfer switch components including circuit breakers, control relays, and associated branch circuits with appropriate color-coded conductors and proper terminations. All electrical connections were secured, panels were properly grounded, and installation was completed in accordance with NEC requirements and local code specifications.
Steven W.
Steven W. Checked in
Completed installation of electrical transfer switch system under permit 20261788. Installed new meter socket panel and transfer switch panel on exterior wall with proper conduit runs and weatherhead connections. Wired internal transfer switch components including circuit breakers, control relays, and associated branch circuits with appropriate color-coded conductors and proper terminations. All electrical connections were secured, panels were properly grounded, and installation was completed in accordance with NEC requirements and local code specifications.
Owensboro, KY 42303
Conducted comprehensive HVAC system replacement estimate for residential property. Evaluated existing upflow furnace configuration and assessed current electrical panel capacity, documenting 60-amp circuit availability and breaker conditions. Measured existing equipment dimensions (147" height x 22" width x 24" depth) and plenum specifications, calculated total height requirements at 96" with coil positioning at 63.5" from base, and verified ductwork connections including 12x20 return grill specifications to provide accurate replacement system recommendations.
Conducted comprehensive HVAC system replacement estimate for residential property. Evaluated existing upflow furnace configuration and assessed current electrical panel capacity, documenting 60-amp circuit availability and breaker conditions. Measured existing equipment dimensions (147" height x 22" width x 24" depth) and plenum specifications, calculated total height requirements at 96" with coil positioning at 63.5" from base, and verified ductwork connections including 12x20 return grill specifications to provide accurate replacement system recommendations.
James W.
James W. Checked in
Conducted comprehensive HVAC system replacement estimate for residential property. Evaluated existing upflow furnace configuration and assessed current electrical panel capacity, documenting 60-amp circuit availability and breaker conditions. Measured existing equipment dimensions (147" height x 22" width x 24" depth) and plenum specifications, calculated total height requirements at 96" with coil positioning at 63.5" from base, and verified ductwork connections including 12x20 return grill specifications to provide accurate replacement system recommendations.
Owensboro, KY 42303
Conducted comprehensive electrical estimate for whole-house generator installation at residential property equipped with 200-amp breaker panel and natural gas service. Evaluated existing electrical infrastructure, documented main breaker panel specifications, and assessed outdoor installation location on rear patio adjacent to French doors for optimal generator placement and utility connections. Provided detailed recommendations for generator sizing, transfer switch installation, and required electrical modifications to integrate standby power system with existing 240V AC service.
Conducted comprehensive electrical estimate for whole-house generator installation at residential property equipped with 200-amp breaker panel and natural gas service. Evaluated existing electrical infrastructure, documented main breaker panel specifications, and assessed outdoor installation location on rear patio adjacent to French doors for optimal generator placement and utility connections. Provided detailed recommendations for generator sizing, transfer switch installation, and required electrical modifications to integrate standby power system with existing 240V AC service.
James W.
James W. Checked in
Conducted comprehensive electrical estimate for whole-house generator installation at residential property equipped with 200-amp breaker panel and natural gas service. Evaluated existing electrical infrastructure, documented main breaker panel specifications, and assessed outdoor installation location on rear patio adjacent to French doors for optimal generator placement and utility connections. Provided detailed recommendations for generator sizing, transfer switch installation, and required electrical modifications to integrate standby power system with existing 240V AC service.
Owensboro, KY 42303
Owensboro, KY - Responded to no cooling call on 6-year-old residential air conditioning system. Upon arrival, confirmed outdoor condensing unit was not energizing while thermostat was calling for cooling with proper airflow from indoor unit. Performed diagnostic testing and identified failed run capacitor preventing compressor and condenser fan motor operation. Removed defective capacitor and installed replacement unit with proper microfarad rating and voltage specifications. Cycled system through complete cooling cycle, verified proper compressor amperage draw, confirmed condenser fan motor operation, and validated system cooling performance with normal temperature differential across evaporator coil. System restored to full operational status.
Kevin H.
Kevin H. Checked in
Responded to no cooling call on 6-year-old residential air conditioning system. Upon arrival, confirmed outdoor condensing unit was not energizing while thermostat was calling for cooling with proper airflow from indoor unit. Performed diagnostic testing and identified failed run capacitor preventing compressor and condenser fan motor operation. Removed defective capacitor and installed replacement unit with proper microfarad rating and voltage specifications. Cycled system through complete cooling cycle, verified proper compressor amperage draw, confirmed condenser fan motor operation, and validated system cooling performance with normal temperature differential across evaporator coil. System restored to full operational status.
Owensboro, KY 42301
Completed planned duo maintenance on two 12-year-old HVAC systems. Performed comprehensive inspection of both furnace units located in basement utility area, checked all operational components, replaced air filters, and verified proper ductwork connections. Noted moisture condensation present on metal ductwork, which is normal for the environmental conditions. Both systems operating within manufacturer specifications with all safety controls functioning properly.
Completed planned duo maintenance on two 12-year-old HVAC systems. Performed comprehensive inspection of both furnace units located in basement utility area, checked all operational components, replaced air filters, and verified proper ductwork connections. Noted moisture condensation present on metal ductwork, which is normal for the environmental conditions. Both systems operating within manufacturer specifications with all safety controls functioning properly.
Justin M.
Justin M. Checked in
Completed planned duo maintenance on two 12-year-old HVAC systems. Performed comprehensive inspection of both furnace units located in basement utility area, checked all operational components, replaced air filters, and verified proper ductwork connections. Noted moisture condensation present on metal ductwork, which is normal for the environmental conditions. Both systems operating within manufacturer specifications with all safety controls functioning properly.
Owensboro, KY 42301
Completed full HVAC system installation consisting of a 3-ton, 17 SEER Lennox outdoor condensing unit (Model ML17KC2-036-230A02) paired with a 97% efficiency Lennox gas furnace and matching evaporator coil. The outdoor unit was factory-charged with R-454B refrigerant and installed per manufacturer specifications. Indoor equipment was mounted on a wooden platform in the utility closet, with the furnace positioned below the evaporator coil assembly. Installed complete condensate drain system using white PVC piping with proper trap configuration and routing. Connected metallic flexible supply duct from the furnace plenum and installed rigid metal return ductwork. Completed all electrical connections including dedicated disconnect and proper grounding. Verified system startup, confirmed proper airflow, checked refrigerant charge, and tested all safety controls for proper operation.
Completed full HVAC system installation consisting of a 3-ton, 17 SEER Lennox outdoor condensing unit (Model ML17KC2-036-230A02) paired with a 97% efficiency Lennox gas furnace and matching evaporator coil. The outdoor unit was factory-charged with R-454B refrigerant and installed per manufacturer specifications. Indoor equipment was mounted on a wooden platform in the utility closet, with the furnace positioned below the evaporator coil assembly. Installed complete condensate drain system using white PVC piping with proper trap configuration and routing. Connected metallic flexible supply duct from the furnace plenum and installed rigid metal return ductwork. Completed all electrical connections including dedicated disconnect and proper grounding. Verified system startup, confirmed proper airflow, checked refrigerant charge, and tested all safety controls for proper operation.
Ian H.
Ian H. Checked in
Completed full HVAC system installation consisting of a 3-ton, 17 SEER Lennox outdoor condensing unit (Model ML17KC2-036-230A02) paired with a 97% efficiency Lennox gas furnace and matching evaporator coil. The outdoor unit was factory-charged with R-454B refrigerant and installed per manufacturer specifications. Indoor equipment was mounted on a wooden platform in the utility closet, with the furnace positioned below the evaporator coil assembly. Installed complete condensate drain system using white PVC piping with proper trap configuration and routing. Connected metallic flexible supply duct from the furnace plenum and installed rigid metal return ductwork. Completed all electrical connections including dedicated disconnect and proper grounding. Verified system startup, confirmed proper airflow, checked refrigerant charge, and tested all safety controls for proper operation.
Owensboro, KY 42303
Completed annual Platinum Level maintenance on a 6-year-old residential HVAC system. Performed comprehensive inspection of furnace unit and associated ductwork in basement mechanical room, verified thermostat operation and programming settings, and replaced 24x25x5 air filter. All system components found operating within normal parameters with no deficiencies noted.
Completed annual Platinum Level maintenance on a 6-year-old residential HVAC system. Performed comprehensive inspection of furnace unit and associated ductwork in basement mechanical room, verified thermostat operation and programming settings, and replaced 24x25x5 air filter. All system components found operating within normal parameters with no deficiencies noted.
Justin M.
Justin M. Checked in
Completed annual Platinum Level maintenance on a 6-year-old residential HVAC system. Performed comprehensive inspection of furnace unit and associated ductwork in basement mechanical room, verified thermostat operation and programming settings, and replaced 24x25x5 air filter. All system components found operating within normal parameters with no deficiencies noted.
Owensboro, KY 42301
Conducted replacement estimate for residential HVAC system with failed motor and furnace components. Existing unit dating from 2002 was non-operational and powered off at time of assessment. Documented exterior utility connections including gas meter installation and reviewed replacement options with homeowner present.
Conducted replacement estimate for residential HVAC system with failed motor and furnace components. Existing unit dating from 2002 was non-operational and powered off at time of assessment. Documented exterior utility connections including gas meter installation and reviewed replacement options with homeowner present.
Nick B.
Nick B. Checked in
Conducted replacement estimate for residential HVAC system with failed motor and furnace components. Existing unit dating from 2002 was non-operational and powered off at time of assessment. Documented exterior utility connections including gas meter installation and reviewed replacement options with homeowner present.
Owensboro, KY 42301
Conducted comprehensive assessment of existing HVAC system for replacement estimate. Documented current installation consisting of air handler unit and furnace system utilizing R-410A refrigerant in utility closet configuration. Evaluated equipment positioning, ductwork connections including flexible aluminum ducting at ceiling penetration, refrigerant line routing with black insulation, copper tubing connections, and yellow flexible gas line installation. Photographed electrical control board (HOM-300) and all mechanical components to provide accurate replacement specifications and system upgrade recommendations for Green A+ efficiency rating equipment.
Conducted comprehensive assessment of existing HVAC system for replacement estimate. Documented current installation consisting of air handler unit and furnace system utilizing R-410A refrigerant in utility closet configuration. Evaluated equipment positioning, ductwork connections including flexible aluminum ducting at ceiling penetration, refrigerant line routing with black insulation, copper tubing connections, and yellow flexible gas line installation. Photographed electrical control board (HOM-300) and all mechanical components to provide accurate replacement specifications and system upgrade recommendations for Green A+ efficiency rating equipment.
Cole C.
Cole C. Checked in
Conducted comprehensive assessment of existing HVAC system for replacement estimate. Documented current installation consisting of air handler unit and furnace system utilizing R-410A refrigerant in utility closet configuration. Evaluated equipment positioning, ductwork connections including flexible aluminum ducting at ceiling penetration, refrigerant line routing with black insulation, copper tubing connections, and yellow flexible gas line installation. Photographed electrical control board (HOM-300) and all mechanical components to provide accurate replacement specifications and system upgrade recommendations for Green A+ efficiency rating equipment.
Owensboro, KY 42303
# Summary

Provided second opinion on 17-year-old Ruud system with no cooling and excessive condensation in drip pan. Previous company diagnosed thermal expansion valve failure, which was confirmed during inspection along with significant condensation buildup on refrigerant lines indicating restricted refrigerant flow.

# Work Performed

Arrived on site and performed comprehensive diagnostic evaluation of non-cooling HVAC system. Verified thermostat operation showing room temperature at 77°F with set point at 74°F in cooling mode. System was energized but failing to achieve desired temperature.

Inspected evaporator coil assembly and refrigerant lines in utility closet installation. Observed heavy condensation accumulation on metallic ductwork and refrigerant piping, indicating potential restriction in refrigerant circuit. Examined R-410A system components including furnace unit, electrical panel, and associated refrigerant lines with red valve handles.

Confirmed previous diagnosis of
# Summary

Provided second opinion on 17-year-old Ruud system with no cooling and excessive condensation in drip pan. Previous company diagnosed thermal expansion valve failure, which was confirmed during inspection along with significant condensation buildup on refrigerant lines indicating restricted refrigerant flow.

# Work Performed

Arrived on site and performed comprehensive diagnostic evaluation of non-cooling HVAC system. Verified thermostat operation showing room temperature at 77°F with set point at 74°F in cooling mode. System was energized but failing to achieve desired temperature.

Inspected evaporator coil assembly and refrigerant lines in utility closet installation. Observed heavy condensation accumulation on metallic ductwork and refrigerant piping, indicating potential restriction in refrigerant circuit. Examined R-410A system components including furnace unit, electrical panel, and associated refrigerant lines with red valve handles.

Confirmed previous diagnosis of
Cole C.
Cole C. Checked in
# Summary Provided second opinion on 17-year-old Ruud system with no cooling and excessive condensation in drip pan. Previous company diagnosed thermal expansion valve failure, which was confirmed during inspection along with significant condensation buildup on refrigerant lines indicating restricted refrigerant flow. # Work Performed Arrived on site and performed comprehensive diagnostic evaluation of non-cooling HVAC system. Verified thermostat operation showing room temperature at 77°F with set point at 74°F in cooling mode. System was energized but failing to achieve desired temperature. Inspected evaporator coil assembly and refrigerant lines in utility closet installation. Observed heavy condensation accumulation on metallic ductwork and refrigerant piping, indicating potential restriction in refrigerant circuit. Examined R-410A system components including furnace unit, electrical panel, and associated refrigerant lines with red valve handles. Confirmed previous diagnosis of
Owensboro, KY 42303
# HVAC Service Completed

Responded to no-cooling call with indoor temperature at 83°F and compressor not operating. Performed diagnostic inspection of outdoor unit and electrical system. Inspected control board and electrical connections, identifying issue with compressor circuit. Examined main electrical panel and verified proper breaker operation and power supply to HVAC system. Tested voltage at control board terminals and connection points. Documented electrical components and wiring configuration with diagnostic photos. Identified failed control board preventing compressor operation. Advised customer of findings and recommended control board replacement to restore cooling function.
# HVAC Service Completed

Responded to no-cooling call with indoor temperature at 83°F and compressor not operating. Performed diagnostic inspection of outdoor unit and electrical system. Inspected control board and electrical connections, identifying issue with compressor circuit. Examined main electrical panel and verified proper breaker operation and power supply to HVAC system. Tested voltage at control board terminals and connection points. Documented electrical components and wiring configuration with diagnostic photos. Identified failed control board preventing compressor operation. Advised customer of findings and recommended control board replacement to restore cooling function.
Cole C.
Cole C. Checked in
# HVAC Service Completed Responded to no-cooling call with indoor temperature at 83°F and compressor not operating. Performed diagnostic inspection of outdoor unit and electrical system. Inspected control board and electrical connections, identifying issue with compressor circuit. Examined main electrical panel and verified proper breaker operation and power supply to HVAC system. Tested voltage at control board terminals and connection points. Documented electrical components and wiring configuration with diagnostic photos. Identified failed control board preventing compressor operation. Advised customer of findings and recommended control board replacement to restore cooling function.
Owensboro, KY 42301
Conducted comprehensive on-site estimate for tankless gas water heater installation. Evaluated existing A.O. Smith ProMax tank-style water heater and associated plumbing infrastructure, including copper supply lines, gas connections, and venting system. Assessed current ductwork condition, noting deterioration and mineral deposits on galvanized venting components. Documented electrical controls, mechanical systems integration, and utility room configuration to determine optimal placement and requirements for tankless conversion. Photographed existing installation, pipe routing, and structural considerations necessary for proper sizing and specification of new tankless gas unit.
Conducted comprehensive on-site estimate for tankless gas water heater installation. Evaluated existing A.O. Smith ProMax tank-style water heater and associated plumbing infrastructure, including copper supply lines, gas connections, and venting system. Assessed current ductwork condition, noting deterioration and mineral deposits on galvanized venting components. Documented electrical controls, mechanical systems integration, and utility room configuration to determine optimal placement and requirements for tankless conversion. Photographed existing installation, pipe routing, and structural considerations necessary for proper sizing and specification of new tankless gas unit.
Isaac G.
Isaac G. Checked in
Conducted comprehensive on-site estimate for tankless gas water heater installation. Evaluated existing A.O. Smith ProMax tank-style water heater and associated plumbing infrastructure, including copper supply lines, gas connections, and venting system. Assessed current ductwork condition, noting deterioration and mineral deposits on galvanized venting components. Documented electrical controls, mechanical systems integration, and utility room configuration to determine optimal placement and requirements for tankless conversion. Photographed existing installation, pipe routing, and structural considerations necessary for proper sizing and specification of new tankless gas unit.
Owensboro, KY 42303
Responded to no cooling call on 8-year-old residential HVAC system. Upon arrival, confirmed indoor unit blowing warm air with outdoor condenser not responding. Verified no frozen coils or tripped breakers present. Inspected basement-mounted furnace cabinet and filter housing. Found 20x20x4 air filter in place with moderate dust accumulation. Diagnosed outdoor unit failure to energize as primary issue preventing cooling operation. Documented equipment condition and filter status with photos for service records.
Responded to no cooling call on 8-year-old residential HVAC system. Upon arrival, confirmed indoor unit blowing warm air with outdoor condenser not responding. Verified no frozen coils or tripped breakers present. Inspected basement-mounted furnace cabinet and filter housing. Found 20x20x4 air filter in place with moderate dust accumulation. Diagnosed outdoor unit failure to energize as primary issue preventing cooling operation. Documented equipment condition and filter status with photos for service records.
Francis I.
Francis I. Checked in
Responded to no cooling call on 8-year-old residential HVAC system. Upon arrival, confirmed indoor unit blowing warm air with outdoor condenser not responding. Verified no frozen coils or tripped breakers present. Inspected basement-mounted furnace cabinet and filter housing. Found 20x20x4 air filter in place with moderate dust accumulation. Diagnosed outdoor unit failure to energize as primary issue preventing cooling operation. Documented equipment condition and filter status with photos for service records.
Owensboro, KY 42303
Completed first visit of planned quarterly maintenance on mini split system. Inspected washable filters, verified proper airflow through ventilation components, and documented temperature differential readings showing system operating within normal parameters at 57°F supply and 135°F discharge temperatures.
Completed first visit of planned quarterly maintenance on mini split system. Inspected washable filters, verified proper airflow through ventilation components, and documented temperature differential readings showing system operating within normal parameters at 57°F supply and 135°F discharge temperatures.
Brent D.
Brent D. Checked in
Completed first visit of planned quarterly maintenance on mini split system. Inspected washable filters, verified proper airflow through ventilation components, and documented temperature differential readings showing system operating within normal parameters at 57°F supply and 135°F discharge temperatures.
Owensboro, KY 42303
Owensboro, KY - Completed delivery and placement of 24kW standby generator unit in residential garage. Generator remains in factory packaging awaiting final installation and electrical connection to home's power system.
Cole B.
Cole B. Checked in
Completed delivery and placement of 24kW standby generator unit in residential garage. Generator remains in factory packaging awaiting final installation and electrical connection to home's power system.
Owensboro, KY 42303
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What To Expect

Discover The A+ Derr Difference

24/7 Heating & Cooling Repairs​

Heating and cooling emergencies can happen on nights, weekends, and holidays, so you can trust us to be there no matter when you need us.

Licensed & Experienced Technicians​

Our experts have the expertise and training to deliver the highest quality services every time.

100% Satisfaction Guarantee​

Our team is dedicated to ensuring your 100% satisfaction with every HVAC service we perform.

Servicing All Major Makes & Models Of Equipment

We are a Lennox Premier Dealer and also service on all makes and models of equipment, including Goodman, Amana, Carrier, Trane, Rheem & more!

Locally Owned & Operated​

Since we’re based in Kentuckiana, we know the needs of Evansville, Louisville, and surrounding communities.

50+ Years in Business​

For over 50 years, A+ Derr has provided high-quality service, products, and results for Kentuckiana's residents.

24/7 Heating & Cooling Repairs​

Heating and cooling emergencies can happen on nights, weekends, and holidays, so you can trust us to be there no matter when you need us.

Licensed & Experienced Technicians​

Our experts have the expertise and training to deliver the highest quality services every time.

100% Satisfaction Guarantee​

Our team is dedicated to ensuring your 100% satisfaction with every HVAC service we perform.

Servicing All Major Makes & Models Of Equipment

We are a Lennox Premier Dealer and also service on all makes and models of equipment, including Goodman, Amana, Carrier, Trane, Rheem & more!

Locally Owned & Operated​

Since we’re based in Kentuckiana, we know the needs of Evansville, Louisville, and surrounding communities.

50+ Years in Business​

For over 50 years, A+ Derr has provided high-quality service, products, and results for Kentuckiana's residents.

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Our Reviews

See What Your Neighbors Are Saying

I would recommend A+ Derr and their staff any day! Best service I have ever had! Go to them for your Heating and Cooling needs. You will not be disappointed.

Barbara C.

Barbara C.

Very good service. Knowledgeable HVAC experts always keeping us cool in the summer and warm all winter. This is a great team of professionals from start to finish.

Craig B.

Craig B.

Amazing level of courtesy and professionalism. Communication was great and the price was more than reasonable. Highly recommend.

Chip M.

Chip M.

Guys came and installed two full systems at the house. Respectful, cleaned up after themselves and answered any and all questions. Thank you again!! Definitely recommend!

Jason H.

Jason H.

Very knowledgeable and courteous. Toured me through all the functions of the new unit. Completed work very neatly and respectfully. Would recommend to anyone.

Derek S.

Derek S.