Local HVAC Services In Boonville, IN | 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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Heating, Cooling & Indoor Air Quality in Boonville, IN

A good HVAC system in your home can make hot and cold days much more bearable. If your heater or air conditioner isn’t keeping up with the outdoor temperatures, look to A+ Derr Heating & Cooling for help. Our expert technicians can uncover the root cause of your system’s issues and provide the most necessary solutions.Contact the A+ Derr team online or call 833-232-4328 to schedule HVAC services at your Boonville home.

Heating Services

Staying warm during the cold winter months requires a top-notch heating unit. When it’s time for repair, replacement, or maintenance, turn to the pros at A+ Derr. We can provide services for every type of heating unit, including:

  • Furnaces: We guarantee that your furnace has a good heating element, blower motor, and air filter. We provide furnace installation, maintenance, and repairs.
  • Heat Pumps: We’ll make sure your heat pump is still moving heat energy into your home from outside.
  • Ductless mini-splits: We’ll ensure that your wall-mounted mini-split can still control the climate in your room.

Air Conditioning in Boonville, IN

Even in Indiana, the summer temperatures can reach well into the 80s and 90s. Is your AC ready to keep you cool all summer long? If not, turn to the A+ Derr team for assistance. We offer:

  • Installation and replacement: Our team can replace your old, dying AC with a brand-new, energy-efficient model.
  • Repair: Our staff can diagnose and resolve any problem going on with your AC unit.
  • Maintenance: Our crew can perform a comprehensive, multipoint inspection of the internal workings of your AC system.

Whether you have an air conditioner, heat pump, or series of ductless mini-splits, look to A+ Derr for the services you need most. Call 833-232-4328 now or contact us online to get started.

Benefits of Upgrading Your HVAC System

Replacing any part of your HVAC system can make a world of difference in your home’s climate. Just a few perks of replacing your system include:

  • Consistent heating and cooling for every room: Enjoy comfortable temperatures wherever you go in your house.
  • Lower energy bills and a reduced carbon footprint: Save money and help save the planet simultaneously.
  • Less chance of needing regular repairs and maintenance: New HVAC systems are much less likely to need repairs for a while after installation.

Reach out to A+ Derr online or call 833-232-4328 now to schedule HVAC system replacement services in Boonville.

Indoor Air Quality Services

Breathing the cleanest air possible is vital to your health. With the right indoor air quality services, you can rest easy knowing your air is pure. You may have low-quality air throughout your home if:

  • You have experienced more allergies in recent months
  • You notice layers of dust on your tables and surfaces
  • Your HVAC filters seem dustier than ever before

Enjoy clean air every day with help from A+ Derr. Contact us online or call our team at 833-232-4328 to schedule IAQ services.

Why Choose A+ Derr?

Since 1975, A+ Derr has been resolving HVAC problems for clients throughout the Boonville region. Our fourth-generation family business treats every client like one of our own. You can count on us for free estimates, 24/7 emergency service, Lennox-brand HVAC units, and a 100% satisfaction guarantee.Schedule HVAC services in Boonville, IN, now by calling 833-232-4328 or contacting us online.

Recent Jobs and Reviews in Boonville, IN

Job Locations and Reviews

Boonville, IN - Conducted on-site evaluation for complete HVAC system replacement at residential property. Documented existing outdoor equipment configuration, including current piping layout, plumbing connections, and available workspace for new system installation. Captured detailed photographs of installation area to provide accurate assessment for equipment specifications, required modifications to existing infrastructure, and comprehensive replacement quote preparation.
Danny M.
Danny M. Checked in
Conducted on-site evaluation for complete HVAC system replacement at residential property. Documented existing outdoor equipment configuration, including current piping layout, plumbing connections, and available workspace for new system installation. Captured detailed photographs of installation area to provide accurate assessment for equipment specifications, required modifications to existing infrastructure, and comprehensive replacement quote preparation.
Boonville, IN 47601
Responded to no cooling call on approximately 20-year-old space pak system that was unable to maintain temperature setpoint, with thermostat set to 78°F but indoor temperature reading 85°F. Upon inspection, found aging high-velocity HVAC system installed in attic space showing signs of significant wear and decreased capacity. System evaluation revealed unit was operating but struggling to achieve adequate cooling output due to age-related degradation. Documented existing equipment condition including heavily insulated refrigerant lines and attic-mounted air handler configuration typical of space pak installations. Discussed system performance limitations with homeowner and provided options for improving comfort, including repair versus replacement considerations given the advanced age of the equipment and diminishing efficiency.
Responded to no cooling call on approximately 20-year-old space pak system that was unable to maintain temperature setpoint, with thermostat set to 78°F but indoor temperature reading 85°F. Upon inspection, found aging high-velocity HVAC system installed in attic space showing signs of significant wear and decreased capacity. System evaluation revealed unit was operating but struggling to achieve adequate cooling output due to age-related degradation. Documented existing equipment condition including heavily insulated refrigerant lines and attic-mounted air handler configuration typical of space pak installations. Discussed system performance limitations with homeowner and provided options for improving comfort, including repair versus replacement considerations given the advanced age of the equipment and diminishing efficiency.
Danny M.
Danny M. Checked in
Responded to no cooling call on approximately 20-year-old space pak system that was unable to maintain temperature setpoint, with thermostat set to 78°F but indoor temperature reading 85°F. Upon inspection, found aging high-velocity HVAC system installed in attic space showing signs of significant wear and decreased capacity. System evaluation revealed unit was operating but struggling to achieve adequate cooling output due to age-related degradation. Documented existing equipment condition including heavily insulated refrigerant lines and attic-mounted air handler configuration typical of space pak installations. Discussed system performance limitations with homeowner and provided options for improving comfort, including repair versus replacement considerations given the advanced age of the equipment and diminishing efficiency.
Boonville, IN 47601
Responded to no cooling complaint on 3-4 year old outdoor combination unit that had never been operated in cooling mode. Upon arrival, confirmed reduced airflow and blower motor operating at diminished capacity. Diagnosed system requiring thorough cleaning due to extended period of non-use and accumulated debris affecting airflow and cooling performance. Documented interior ventilation components and system conditions with photos for service records.
Responded to no cooling complaint on 3-4 year old outdoor combination unit that had never been operated in cooling mode. Upon arrival, confirmed reduced airflow and blower motor operating at diminished capacity. Diagnosed system requiring thorough cleaning due to extended period of non-use and accumulated debris affecting airflow and cooling performance. Documented interior ventilation components and system conditions with photos for service records.
Christian C.
Christian C. Checked in
Responded to no cooling complaint on 3-4 year old outdoor combination unit that had never been operated in cooling mode. Upon arrival, confirmed reduced airflow and blower motor operating at diminished capacity. Diagnosed system requiring thorough cleaning due to extended period of non-use and accumulated debris affecting airflow and cooling performance. Documented interior ventilation components and system conditions with photos for service records.
Boonville, IN 47601
Boonville, IN - Responded to no cooling complaint on 10-year-old system with inadequate airflow to upstairs bedroom vents and elevated temperatures reaching 85°F. Investigated ductwork serving affected zones and discovered supply duct disconnection at plenum connection point in attic space. Reconnected and sealed ductwork using mastic, restoring proper airflow to all upstairs registers and resolving temperature imbalance between floors.
Francis I.
Francis I. Checked in
Responded to no cooling complaint on 10-year-old system with inadequate airflow to upstairs bedroom vents and elevated temperatures reaching 85°F. Investigated ductwork serving affected zones and discovered supply duct disconnection at plenum connection point in attic space. Reconnected and sealed ductwork using mastic, restoring proper airflow to all upstairs registers and resolving temperature imbalance between floors.
Boonville, IN 47601
Boonville, IN - Completed second annual Gold Level planned maintenance on 7-year-old residential HVAC system. Performed comprehensive inspection of air handler unit with front panel removed to access internal components including evaporator coil, heat exchanger, and electrical connections. Verified proper operation of all wiring harnesses and checked condition of coils for debris or damage. Inspected PVC condensate drain lines for proper flow and connections. Examined insulated ductwork and verified secure attachment points. Replaced 20x25x5 media filter per maintenance protocol. Checked condensate pump operation and verified proper drainage. All components found operating within normal parameters and system performing as expected.
Christian C.
Christian C. Checked in
Completed second annual Gold Level planned maintenance on 7-year-old residential HVAC system. Performed comprehensive inspection of air handler unit with front panel removed to access internal components including evaporator coil, heat exchanger, and electrical connections. Verified proper operation of all wiring harnesses and checked condition of coils for debris or damage. Inspected PVC condensate drain lines for proper flow and connections. Examined insulated ductwork and verified secure attachment points. Replaced 20x25x5 media filter per maintenance protocol. Checked condensate pump operation and verified proper drainage. All components found operating within normal parameters and system performing as expected.
Boonville, IN 47601
Completed installation of 3-ton, 14.7 SEER Lennox air conditioning system with matching evaporator coil in side yard location. Unit was properly positioned on concrete pad with adequate clearance, refrigerant lines were connected and charged to manufacturer specifications as verified by manifold gauge readings, and system was tested for proper operation with pressures stabilized at 439 PSIG high side and 310.8 PSIG low side with corresponding temperatures confirming correct refrigerant charge.
Completed installation of 3-ton, 14.7 SEER Lennox air conditioning system with matching evaporator coil in side yard location. Unit was properly positioned on concrete pad with adequate clearance, refrigerant lines were connected and charged to manufacturer specifications as verified by manifold gauge readings, and system was tested for proper operation with pressures stabilized at 439 PSIG high side and 310.8 PSIG low side with corresponding temperatures confirming correct refrigerant charge.
Adam M.
Adam M. Checked in
Completed installation of 3-ton, 14.7 SEER Lennox air conditioning system with matching evaporator coil in side yard location. Unit was properly positioned on concrete pad with adequate clearance, refrigerant lines were connected and charged to manufacturer specifications as verified by manifold gauge readings, and system was tested for proper operation with pressures stabilized at 439 PSIG high side and 310.8 PSIG low side with corresponding temperatures confirming correct refrigerant charge.
Boonville, IN 47601
Completed annual planned maintenance on 1-year-old residential HVAC system during second visit. Performed comprehensive inspection of furnace and associated components, verified proper operation of blower motor assembly, and inspected all electrical connections and controls. Replaced 16x25x5 air filter per maintenance schedule. Inspected condensate drain lines, PVC venting system, and flexible ductwork for proper installation and function. All equipment operating within normal parameters with no deficiencies noted.
Completed annual planned maintenance on 1-year-old residential HVAC system during second visit. Performed comprehensive inspection of furnace and associated components, verified proper operation of blower motor assembly, and inspected all electrical connections and controls. Replaced 16x25x5 air filter per maintenance schedule. Inspected condensate drain lines, PVC venting system, and flexible ductwork for proper installation and function. All equipment operating within normal parameters with no deficiencies noted.
Christian C.
Christian C. Checked in
Completed annual planned maintenance on 1-year-old residential HVAC system during second visit. Performed comprehensive inspection of furnace and associated components, verified proper operation of blower motor assembly, and inspected all electrical connections and controls. Replaced 16x25x5 air filter per maintenance schedule. Inspected condensate drain lines, PVC venting system, and flexible ductwork for proper installation and function. All equipment operating within normal parameters with no deficiencies noted.
Boonville, IN 47601
Boonville, IN - Responded to no cooling call on 20-year-old system with complete loss of airflow. Upon arrival, verified Lennox Signature Stat thermostat had power and display was functioning properly. Performed diagnostic evaluation of HVAC system to determine cause of no air handler operation and identified failure requiring system replacement due to age and condition of equipment.
Craig U.
Craig U. Checked in
Responded to no cooling call on 20-year-old system with complete loss of airflow. Upon arrival, verified Lennox Signature Stat thermostat had power and display was functioning properly. Performed diagnostic evaluation of HVAC system to determine cause of no air handler operation and identified failure requiring system replacement due to age and condition of equipment.
Boonville, IN 47601
Completed Platinum Level maintenance on a 6-year-old single HVAC system. Replaced 20x25x5 furnace filter, inspected outdoor condensing unit positioned on concrete pad against building exterior, and verified proper system operation. All components found in good working condition with no issues identified during inspection.
Completed Platinum Level maintenance on a 6-year-old single HVAC system. Replaced 20x25x5 furnace filter, inspected outdoor condensing unit positioned on concrete pad against building exterior, and verified proper system operation. All components found in good working condition with no issues identified during inspection.
Jeremiah H.
Jeremiah H. Checked in
Completed Platinum Level maintenance on a 6-year-old single HVAC system. Replaced 20x25x5 furnace filter, inspected outdoor condensing unit positioned on concrete pad against building exterior, and verified proper system operation. All components found in good working condition with no issues identified during inspection.
Boonville, IN 47601
Conducted comprehensive replacement estimate for 23-year-old residential HVAC system. Evaluated existing outdoor condensing unit located in side yard between house and wooden fence, noting unit positioned on concrete pad with adequate clearance. Assessed current system configuration including downflow air handler setup with existing furnace, evaporator coil, and base components. Documented equipment dimensions and spatial constraints for replacement planning, including 40-foot refrigerant line set routing from outdoor unit to indoor air handling equipment. Photographed existing installation conditions and created technical schematic showing proposed vertical equipment configuration with color-coded component layout. Provided homeowner with detailed replacement options and specifications for new system installation to address aging equipment concerns.
Conducted comprehensive replacement estimate for 23-year-old residential HVAC system. Evaluated existing outdoor condensing unit located in side yard between house and wooden fence, noting unit positioned on concrete pad with adequate clearance. Assessed current system configuration including downflow air handler setup with existing furnace, evaporator coil, and base components. Documented equipment dimensions and spatial constraints for replacement planning, including 40-foot refrigerant line set routing from outdoor unit to indoor air handling equipment. Photographed existing installation conditions and created technical schematic showing proposed vertical equipment configuration with color-coded component layout. Provided homeowner with detailed replacement options and specifications for new system installation to address aging equipment concerns.
James W.
James W. Checked in
Conducted comprehensive replacement estimate for 23-year-old residential HVAC system. Evaluated existing outdoor condensing unit located in side yard between house and wooden fence, noting unit positioned on concrete pad with adequate clearance. Assessed current system configuration including downflow air handler setup with existing furnace, evaporator coil, and base components. Documented equipment dimensions and spatial constraints for replacement planning, including 40-foot refrigerant line set routing from outdoor unit to indoor air handling equipment. Photographed existing installation conditions and created technical schematic showing proposed vertical equipment configuration with color-coded component layout. Provided homeowner with detailed replacement options and specifications for new system installation to address aging equipment concerns.
Boonville, IN 47601
Conducted comprehensive replacement estimate for aging 12-year-old HVAC system at 8,464 square foot residential property. Performed detailed load calculation analysis using energy design software, evaluating home's thermal characteristics including directional glass exposure (614 sq ft east, 430 sq ft west), 30% shading factor, and design conditions of 75°F indoor/92°F outdoor with 76°F wet bulb temperature. Documented existing Blizzard Air Metro furnace and ductwork system, noting equipment condition and current configuration. Assessed requirements for approximately 3-ton replacement system based on property specifications and customer's comfort needs.
Conducted comprehensive replacement estimate for aging 12-year-old HVAC system at 8,464 square foot residential property. Performed detailed load calculation analysis using energy design software, evaluating home's thermal characteristics including directional glass exposure (614 sq ft east, 430 sq ft west), 30% shading factor, and design conditions of 75°F indoor/92°F outdoor with 76°F wet bulb temperature. Documented existing Blizzard Air Metro furnace and ductwork system, noting equipment condition and current configuration. Assessed requirements for approximately 3-ton replacement system based on property specifications and customer's comfort needs.
James W.
James W. Checked in
Conducted comprehensive replacement estimate for aging 12-year-old HVAC system at 8,464 square foot residential property. Performed detailed load calculation analysis using energy design software, evaluating home's thermal characteristics including directional glass exposure (614 sq ft east, 430 sq ft west), 30% shading factor, and design conditions of 75°F indoor/92°F outdoor with 76°F wet bulb temperature. Documented existing Blizzard Air Metro furnace and ductwork system, noting equipment condition and current configuration. Assessed requirements for approximately 3-ton replacement system based on property specifications and customer's comfort needs.
Boonville, IN 47601
Responded to a warranty cooling issue where the system was not producing cold air and the residence was maintaining approximately 80 degrees. Upon inspection, diagnosed a failed outdoor control board and damaged condenser fan wiring harness. Replaced the outdoor condensing unit to resolve the electrical failures affecting system operation. Verified proper electrical connections, tested system functionality, and confirmed adequate cooling performance upon completion.
Responded to a warranty cooling issue where the system was not producing cold air and the residence was maintaining approximately 80 degrees. Upon inspection, diagnosed a failed outdoor control board and damaged condenser fan wiring harness. Replaced the outdoor condensing unit to resolve the electrical failures affecting system operation. Verified proper electrical connections, tested system functionality, and confirmed adequate cooling performance upon completion.
Justin M.
Justin M. Checked in
Responded to a warranty cooling issue where the system was not producing cold air and the residence was maintaining approximately 80 degrees. Upon inspection, diagnosed a failed outdoor control board and damaged condenser fan wiring harness. Replaced the outdoor condensing unit to resolve the electrical failures affecting system operation. Verified proper electrical connections, tested system functionality, and confirmed adequate cooling performance upon completion.
Boonville, IN 47601
Completed routine planned maintenance on residential air conditioning system. Performed comprehensive system inspection and diagnostic testing using digital multimeter to verify electrical readings and proper voltage levels throughout the unit. All measurements were within manufacturer specifications at 44.55 volts as documented. Conducted standard AC tune-up procedures including visual inspection of all accessible components, ductwork examination, and equipment performance verification to ensure optimal system operation for the cooling season.
Completed routine planned maintenance on residential air conditioning system. Performed comprehensive system inspection and diagnostic testing using digital multimeter to verify electrical readings and proper voltage levels throughout the unit. All measurements were within manufacturer specifications at 44.55 volts as documented. Conducted standard AC tune-up procedures including visual inspection of all accessible components, ductwork examination, and equipment performance verification to ensure optimal system operation for the cooling season.
Michael H.
Michael H. Checked in
Completed routine planned maintenance on residential air conditioning system. Performed comprehensive system inspection and diagnostic testing using digital multimeter to verify electrical readings and proper voltage levels throughout the unit. All measurements were within manufacturer specifications at 44.55 volts as documented. Conducted standard AC tune-up procedures including visual inspection of all accessible components, ductwork examination, and equipment performance verification to ensure optimal system operation for the cooling season.
Boonville, IN 47601
# HVAC Maintenance Summary

Completed annual planned maintenance on one-year-old HVAC system during second scheduled visit. Performed comprehensive inspection of indoor furnace unit and outdoor condensing unit, checking all electrical connections, refrigerant levels, and mechanical components. Replaced 20x25x5 air filter, verified proper operation of all safety controls, and confirmed system performance meets manufacturer specifications. All equipment operating efficiently with no issues identified.
# HVAC Maintenance Summary

Completed annual planned maintenance on one-year-old HVAC system during second scheduled visit. Performed comprehensive inspection of indoor furnace unit and outdoor condensing unit, checking all electrical connections, refrigerant levels, and mechanical components. Replaced 20x25x5 air filter, verified proper operation of all safety controls, and confirmed system performance meets manufacturer specifications. All equipment operating efficiently with no issues identified.
Christian C.
Christian C. Checked in
# HVAC Maintenance Summary Completed annual planned maintenance on one-year-old HVAC system during second scheduled visit. Performed comprehensive inspection of indoor furnace unit and outdoor condensing unit, checking all electrical connections, refrigerant levels, and mechanical components. Replaced 20x25x5 air filter, verified proper operation of all safety controls, and confirmed system performance meets manufacturer specifications. All equipment operating efficiently with no issues identified.
Boonville, IN 47601
Completed annual planned maintenance on 11-month-old HVAC system. Replaced 16x25x5 air filter and performed comprehensive system inspection. Measured supply air temperature at 55.2°F and verified electrical parameters within normal operating range. Conducted visual inspection of blower assembly and internal components, noting normal dust accumulation for system age. All equipment operating properly with no deficiencies identified. System ready for continued service with annual maintenance renewal recommended.
Completed annual planned maintenance on 11-month-old HVAC system. Replaced 16x25x5 air filter and performed comprehensive system inspection. Measured supply air temperature at 55.2°F and verified electrical parameters within normal operating range. Conducted visual inspection of blower assembly and internal components, noting normal dust accumulation for system age. All equipment operating properly with no deficiencies identified. System ready for continued service with annual maintenance renewal recommended.
Michael H.
Michael H. Checked in
Completed annual planned maintenance on 11-month-old HVAC system. Replaced 16x25x5 air filter and performed comprehensive system inspection. Measured supply air temperature at 55.2°F and verified electrical parameters within normal operating range. Conducted visual inspection of blower assembly and internal components, noting normal dust accumulation for system age. All equipment operating properly with no deficiencies identified. System ready for continued service with annual maintenance renewal recommended.
Boonville, IN 47601
Completed full HVAC system installation featuring a 3-ton, 18 SEER Lennox unit with 99% AFUE furnace in interior closet space. Installation included proper venting with PVC condensate drainage, gas line connections, electrical wiring, and flexible ductwork integration, with system tested and operational upon completion.
Completed full HVAC system installation featuring a 3-ton, 18 SEER Lennox unit with 99% AFUE furnace in interior closet space. Installation included proper venting with PVC condensate drainage, gas line connections, electrical wiring, and flexible ductwork integration, with system tested and operational upon completion.
Ian H.
Ian H. Checked in
Completed full HVAC system installation featuring a 3-ton, 18 SEER Lennox unit with 99% AFUE furnace in interior closet space. Installation included proper venting with PVC condensate drainage, gas line connections, electrical wiring, and flexible ductwork integration, with system tested and operational upon completion.
Boonville, IN 47601
Boonville, IN - Completed second annual planned maintenance visit on Lennox heat pump system. Performed comprehensive inspection of outdoor unit, verified proper operation of compressor and fan motors, checked refrigerant line insulation and electrical connections at disconnect box, and confirmed all line-set covers and exterior components remain secure and properly sealed. System operating within normal parameters with no deficiencies noted.
Christian C.
Christian C. Checked in
Completed second annual planned maintenance visit on Lennox heat pump system. Performed comprehensive inspection of outdoor unit, verified proper operation of compressor and fan motors, checked refrigerant line insulation and electrical connections at disconnect box, and confirmed all line-set covers and exterior components remain secure and properly sealed. System operating within normal parameters with no deficiencies noted.
Boonville, IN 47601
Conducted comprehensive HVAC replacement estimate for existing customer with non-operational system. Performed thorough assessment of current equipment including furnace and related components, documented existing electrical infrastructure and circuit panel configuration to determine compatibility requirements for new system installation. Evaluated installation conditions including wall penetrations, equipment mounting locations, and basement utility space layout to provide accurate replacement recommendations and specifications.
Conducted comprehensive HVAC replacement estimate for existing customer with non-operational system. Performed thorough assessment of current equipment including furnace and related components, documented existing electrical infrastructure and circuit panel configuration to determine compatibility requirements for new system installation. Evaluated installation conditions including wall penetrations, equipment mounting locations, and basement utility space layout to provide accurate replacement recommendations and specifications.
Nick B.
Nick B. Checked in
Conducted comprehensive HVAC replacement estimate for existing customer with non-operational system. Performed thorough assessment of current equipment including furnace and related components, documented existing electrical infrastructure and circuit panel configuration to determine compatibility requirements for new system installation. Evaluated installation conditions including wall penetrations, equipment mounting locations, and basement utility space layout to provide accurate replacement recommendations and specifications.
Boonville, IN 47601
Responded to no-cooling complaint on 4-year-old residential HVAC system where outdoor unit was running continuously without cycling off. Upon arrival, performed diagnostic evaluation of condensing unit and control board operations. Connected manifold gauges to measure refrigerant pressures and inspected electrical components including circuit boards, capacitors, and contactor assembly. Identified issue with outdoor unit failing to respond to thermostat call properly, causing continuous operation regardless of indoor temperature demand. Inspected Emerson control board for proper relay function and verified all wire connections at terminal blocks. Checked capacitor values and contactor operation to rule out mechanical failure. System was cycling properly at time of inspection after being turned off overnight by homeowner. Advised on proper thermostat operation and system monitoring going forward.
Responded to no-cooling complaint on 4-year-old residential HVAC system where outdoor unit was running continuously without cycling off. Upon arrival, performed diagnostic evaluation of condensing unit and control board operations. Connected manifold gauges to measure refrigerant pressures and inspected electrical components including circuit boards, capacitors, and contactor assembly. Identified issue with outdoor unit failing to respond to thermostat call properly, causing continuous operation regardless of indoor temperature demand. Inspected Emerson control board for proper relay function and verified all wire connections at terminal blocks. Checked capacitor values and contactor operation to rule out mechanical failure. System was cycling properly at time of inspection after being turned off overnight by homeowner. Advised on proper thermostat operation and system monitoring going forward.
Christian C.
Christian C. Checked in
Responded to no-cooling complaint on 4-year-old residential HVAC system where outdoor unit was running continuously without cycling off. Upon arrival, performed diagnostic evaluation of condensing unit and control board operations. Connected manifold gauges to measure refrigerant pressures and inspected electrical components including circuit boards, capacitors, and contactor assembly. Identified issue with outdoor unit failing to respond to thermostat call properly, causing continuous operation regardless of indoor temperature demand. Inspected Emerson control board for proper relay function and verified all wire connections at terminal blocks. Checked capacitor values and contactor operation to rule out mechanical failure. System was cycling properly at time of inspection after being turned off overnight by homeowner. Advised on proper thermostat operation and system monitoring going forward.
Boonville, IN 47601
Completed first-year planned maintenance visit on HVAC system. Upon arrival, filter size was not documented in system records, so measurements were collected for future service reference. Removed and inspected air filter, which showed heavy accumulation of dust, dirt, and debris throughout all pleated sections despite the unit being only one year old. Performed diagnostic testing using refrigeration gauges, observing significant condensation on refrigerant lines indicating system was operating and cooling properly. Documented filter condition and equipment measurements with photos for service records. Filter replacement recommended due to excessive contamination that could restrict airflow and reduce system efficiency.
Completed first-year planned maintenance visit on HVAC system. Upon arrival, filter size was not documented in system records, so measurements were collected for future service reference. Removed and inspected air filter, which showed heavy accumulation of dust, dirt, and debris throughout all pleated sections despite the unit being only one year old. Performed diagnostic testing using refrigeration gauges, observing significant condensation on refrigerant lines indicating system was operating and cooling properly. Documented filter condition and equipment measurements with photos for service records. Filter replacement recommended due to excessive contamination that could restrict airflow and reduce system efficiency.
Michael H.
Michael H. Checked in
Completed first-year planned maintenance visit on HVAC system. Upon arrival, filter size was not documented in system records, so measurements were collected for future service reference. Removed and inspected air filter, which showed heavy accumulation of dust, dirt, and debris throughout all pleated sections despite the unit being only one year old. Performed diagnostic testing using refrigeration gauges, observing significant condensation on refrigerant lines indicating system was operating and cooling properly. Documented filter condition and equipment measurements with photos for service records. Filter replacement recommended due to excessive contamination that could restrict airflow and reduce system efficiency.
Boonville, IN 47601
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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.