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.Â
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
# 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
# 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.
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.
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.
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 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.
Completed monthly planned maintenance on Gold Level single system with 20+ year old equipment. Performed comprehensive inspection of outdoor condenser unit, checked refrigerant levels, cleaned coils, verified proper airflow through louvers, and replaced CFI filter. Unit operating within normal parameters with no immediate concerns noted.
Completed first annual Platinum Level maintenance on single-system HVAC unit installed in April 2020. Performed comprehensive inspection of control board and electrical components, verified proper operation of all circuits and connections, and replaced 20x20x5 filter. Documented system condition with detailed photos of internal components and control panel for service records.
Provided estimate for installation of new gas line to kitchen area. Assessed existing outdoor gas meter and infrastructure to determine routing requirements and connection points. Additionally, evaluated continuously running toilet to diagnose malfunction and determine repair needs.
Conducted comprehensive replacement estimate for aging HVAC system experiencing intermittent operational issues. Evaluated existing outdoor condensing unit with refrigerant line set running along exterior brick wall to interior disconnect box, and assessed indoor climate control system including digital thermostat currently set at 76 degrees. Documented equipment configuration, electrical connections, refrigerant line routing, and overall system layout to provide homeowner with complete replacement options and recommendations for new high-efficiency heating and cooling equipment.
Conducted on-site evaluation for natural gas water heater replacement in residential property. Assessed existing 40-gallon tanked unit showing visible corrosion and rust staining on exterior surfaces. Unit located in narrow closet utility space with louvered bifold door access. Documented current installation configuration including gas supply line connections, copper water supply piping, and venting system with black insulated flue pipe. Measured available clearances within closet space to determine feasibility of installing larger capacity unit if desired. Evaluated utility room plumbing infrastructure and access points. Photographed existing equipment condition, pipe connections, and surrounding work area for estimate preparation. Provided professional assessment and recommendations for replacement options suitable for space constraints and customer scheduling requirements between 2-4 PM timeframe.
Conducted on-site electrical estimate for whole-house standby generator installation at residential property equipped with breaker panel and natural gas service. Assessed exterior utility access points, existing gas meter location, and evaluated optimal placement for generator unit along side yard near utility connections. Documented current electrical infrastructure and gas line configuration to develop comprehensive installation proposal for backup power system.
# HVAC Install - Complete System Successfully completed installation of a 3-ton, 17 SEER complete HVAC system including indoor air handler and outdoor condensing unit. The indoor air handler was mounted in the utility room with proper clearances for maintenance and operation. Installation included connection of supply and return ductwork using insulated flexible duct, integration of PVC condensate drainage piping, and electrical wiring to code specifications. Digital thermostat control was installed and programmed for optimal system operation. The outdoor condensing unit was positioned on a composite equipment pad adjacent to the home's exterior wall, ensuring adequate clearance from foundation, landscaping, and windows per manufacturer specifications. Refrigerant lines were properly sized, insulated, and routed from the outdoor unit to the indoor air handler. The system was evacuated, pressure tested for leaks, and charged with refrigerant to manufacturer specifications. All elec
Completed AC tune-up maintenance visit with focus on outdoor condensing unit cleaning. Performed initial brushing of heavily soiled condenser coils which showed significant accumulation of dirt, dust, and debris between fins. Unit requires follow-up visit for thorough coil washing and pressure verification once plumbing repairs are completed to address existing system issues.
Completed first visit of planned duo maintenance on HVAC system. Installed new 16x25x5 MERV 11 filter in air handler unit as part of three-month preventive maintenance schedule. Verified system thermostat functionality and confirmed automatic update settings were enabled for optimal performance monitoring.
Completed follow-up site visit for electrical transfer switch installation. Verified proper installation of Generac automatic transfer switch with associated electrical panels, conduit runs, and circuit protection devices. Interior panels mounted and secured with appropriate clearances, exterior transfer switch equipment properly weatherproofed and configured on brick exterior with PVC conduit system routed from grade level. All connections inspected, system tested and confirmed operational.
Responded to no-cool complaint on residential split system air conditioning unit with dual-fan condensing unit installed in narrow side yard location. Upon arrival, indoor temperature measured 79°F with outdoor ambient at 100°F, indicating insufficient cooling capacity. Performed complete system evaluation including visual inspection of outdoor condensing unit, verification of thermostat operation showing 72°F setpoint, and assessment of airflow from both condenser fans. Condensing unit appeared operational with both fans running, but system unable to maintain desired temperature during extreme heat conditions. Documented equipment configuration and current operating conditions with photographic evidence. Advised customer on potential causes for inadequate cooling performance during peak load conditions, including possible refrigerant charge issues, airflow restrictions, or undersized equipment for cooling load demands. Recommended follow-up diagnostic testing to determine root cause o
Completed full HVAC system installation featuring a 2.5-ton, 15.5 SEER modular air conditioning unit with matching air handler. Installed new outdoor condensing unit, indoor air handler with return air grille and filtration system, established proper refrigerant lines, electrical connections, and condensate drainage. All components tested and verified operational with proper airflow and temperature differential confirmed.
Conducted replacement estimate for aging package unit experiencing refrigerant leaks. System displayed significant exterior corrosion, rust staining around fan assembly, and deteriorated metal casing with paint failure. Homeowner currently utilizing portable air conditioning units due to system failure. Documented unit condition with photographs showing extensive weathering on outdoor equipment positioned on concrete pad against brick structure. Provided comprehensive replacement options as repair was not requested due to extent of system degradation.
Completed preventative maintenance on two air conditioning systems. Performed thorough cleaning of both units, including coil cleaning, filter inspection, and debris removal from mechanical components. Documented equipment condition with photos showing Intertherm air handler installation with proper electrical connections and PVC condensate drainage in place. Both systems operational and ready for continued service.