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
Completed HVAC replacement estimate for a 25-year-old system experiencing refrigerant leaks. Assessed deteriorated equipment housing with significant metal panel damage and structural failure in attic space, documented extensive wear and material separation. Performed comprehensive load calculation for 2,183 square feet of conditioned space, analyzing glass distribution across all exposures with primary orientation east-facing, accounting for 30% shading factor to determine proper equipment sizing for replacement system with financing options.
Completed annual Platinum Level maintenance on single HVAC system with 16x25x5 filter. Performed comprehensive inspection of air handler unit including drain pan, condensate lines, and control board components. Verified proper operation of all electrical connections and terminal blocks. Inspected ductwork, condensate management system, and humidifier connections. All components found to be operating within normal parameters with no issues identified during this first annual maintenance visit.
Completed first scheduled quarterly maintenance visit on HVAC system. Replaced 16x25x5 air filter as part of routine preventive maintenance program. Performed system diagnostics including temperature measurements using calibrated digital thermometer, recording supply air temperature of 52.5°F. Inspected and tested control board assembly, verifying proper electrical connections, terminal blocks, and wiring integrity across all circuits. All components functioning within normal operating parameters.
Completed full HVAC system installation including 3-ton air conditioning unit with 18 SEER rating, 99% AFUE furnace, and associated ductwork modifications. Indoor air handler and outdoor condensing unit were installed, properly connected, and tested for optimal performance. All equipment was labeled with warranty information and maintenance guidelines, system commissioned successfully with proper airflow and refrigerant charge verified.
Completed installation of 12,000 BTU mini-split heat pump system at residential property. Mounted outdoor Lennox condenser unit on platform with proper refrigerant line set and electrical connections, installed indoor air handler, and established condensate drainage via white PVC piping routed along exterior brick wall.
Conducted comprehensive HVAC system evaluation for complete replacement estimate, including assessment of existing ductwork conditions in crawl space and return air system. Inspected underfloor infrastructure revealing aged ductwork, electrical components, and structural considerations for new system installation. Evaluated interior return air grille and ventilation pathways to determine requirements for complete system replacement and duct cleaning services, providing customer with options for full HVAC system upgrade and ductwork remediation.
Responded to inquiry regarding water heater replacement options for residential property. Conducted on-site evaluation of existing gas-fired tank-style water heater located in mechanical room alongside HVAC equipment. Assessed current installation including gas supply lines, venting configuration, electrical connections, and available clearances for potential equipment upgrades. Documented existing conditions showing standard residential water heater with gas control valve, flexible gas connector, and proper safety labeling. Evaluated HVAC ductwork routing and utility connections to determine feasibility of both traditional tank-style and tankless water heater installations. Discussed advantages and specifications of both system types with homeowner, including energy efficiency considerations, space requirements, and installation parameters. Provided comprehensive estimate for replacement options based on site conditions and customer preferences.
Responded to follow-up service call for incomplete HVAC work requiring system charging and furnace door switch replacement. Upon arrival, performed diagnostic temperature measurements on evaporator coil assembly using digital thermometer, recording supply air temperature of 53.6°F at the coil outlet. Documented current system operating conditions with thermal imaging to establish baseline performance metrics. Confirmed refrigerant charge is needed to achieve proper cooling capacity. Inspected furnace cabinet and verified door safety switch remains bypassed from previous service due to broken switch assembly. Photographed equipment conditions and measurement readings for service documentation. System requires return visit to complete refrigerant charging to manufacturer specifications and install replacement door interlock switch to restore proper safety controls on furnace unit.
Completed first scheduled quarterly maintenance visit on mini split system. Performed temperature diagnostics using calibrated digital thermometer, recording supply air temperature of 63.8°F at the air handler unit. Inspected electrical control panel components including contactors, relays, and terminal connections, verifying proper wire routing and secure connections across all circuits. All system components operating within normal parameters.
Responded to no cooling complaint on 7-year-old air conditioning system. Upon arrival, discovered thermostat wire had been previously cut and spliced. Performed diagnostic evaluation of outdoor condensing unit and electrical connections. Inspected disconnect box, conduit routing, and verified unit placement on concrete pad. Documented equipment condition with photos for service records.
Completed annual platinum level maintenance on a 6-year-old HVAC system, including replacement of 16x25x5 filter. Performed comprehensive inspection of system components, verified proper operation, and documented equipment condition with photos. All maintenance tasks completed per manufacturer specifications and platinum service protocol.
Successfully installed a 150-gallon capacity tankless water heater in residential utility closet. Completed full installation including gas line connections, water supply piping with copper and metal configurations, electrical hookup, and proper venting with white PVC exhaust system. Unit mounted securely to wall with all manufacturer specifications met and energy guide labeling in place. Installation coordinated with existing HVAC furnace system in shared mechanical room space, ensuring proper clearances and code compliance throughout.
Completed installation of a 2.5-ton, 15.5 SEER Lennox air conditioning system including outdoor condenser unit and indoor air handler. The outdoor unit was positioned on a concrete pad against the building exterior with proper clearances, and the indoor air handler was installed in the basement utility area with copper refrigerant lines connecting both components.
Conducted comprehensive site assessment for HVAC system replacement and documented existing gas meter installation and utility connections. Photographed current equipment setup including gas meter, piping configuration, shut-off valves, and exterior mounting conditions to support estimate preparation for new high-efficiency system installation.
Responded to no cooling complaint where indoor blower fan operated but system failed to produce cold air. Upon inspection of air handler unit located in attic space, performed diagnostic evaluation of HVAC system. Verified airflow through supply vents and confirmed absence of evaporator coil freeze-up. Assessed electrical connections, refrigerant lines, and condensate drainage system for proper operation. Documented existing installation showing air handler with associated ductwork and plumbing infrastructure in serviceable condition.
Completed comprehensive HVAC replacement estimate for 1950s-era residential property with no existing central air conditioning system and minimal ductwork infrastructure. Assessed utility closet containing current conventional tank water heater and evaluated crawl space conditions with exposed soil floor, aged wooden joists, and metal support columns to determine feasibility for new HVAC equipment installation and complete duct system design. Provided replacement estimate options for full central heating and cooling system, extensive ductwork installation throughout structure, and tankless water heater conversion to replace existing conventional unit.
Completed installation of a 48,000 BTU Lennox mini split system with five indoor air handling units throughout the facility. Mounted wall-hung evaporator units in multiple rooms including office spaces, routed refrigerant lines and condensate drainage through ceiling plenum, and installed exterior condensing unit. All units tested and verified operational with proper airflow and temperature differential.
Completed follow-up installation of whole-home humidifier system on existing HVAC air handler unit. Connected humidifier water supply line using copper piping with brass compression fittings and shut-off valve for maintenance access. Verified proper integration with forced air system and tested unit operation to ensure adequate humidity distribution throughout the home.
Completed installation of 3-ton, 19 SEER heat pump system with matching air handler. Installed outdoor condensing unit on concrete pad against exterior wall with refrigerant lines properly routed and secured to building structure, connected indoor air handler, performed system startup and commissioning procedures including refrigerant charge verification using digital manifold gauges to ensure proper operating pressures and temperatures for optimal system performance.
Completed complimentary HVAC system maintenance tune-up as requested. Performed standard preventive maintenance procedures on the heating and cooling system, inspected the 16x20x4 UMC filter box assembly, and documented equipment conditions including the A.O. Smith water heater and associated mechanical components in the utility space.