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 full HVAC system installation including a 2-ton, 16 SEER air conditioning unit paired with a 96% efficiency upflow furnace, 40-gallon State brand water heater, and sump pump system. All equipment was installed in the basement utility area with proper venting using white PVC piping, copper water connections to the water heater, and appropriate ductwork connections. The furnace was mounted against the back wall with condensate drain lines properly routed, electrical connections completed, and all safety labels visible and intact. The water heater was positioned adjacent to the HVAC unit with supply and discharge piping installed to code. All components were tested for proper operation and the installation area was left clean and organized.
Completed comprehensive HVAC system replacement estimate for aging residential cooling system. Evaluated existing York brand outdoor condensing unit positioned on concrete pad against brick exterior, noting electrical disconnect and refrigerant line routing. Assessed interior components including basement installation with PVC condensate drainage system and associated plumbing connections. Provided detailed replacement recommendations for complete system upgrade to improve efficiency and reliability.
Completed annual planned maintenance on residential HVAC system with outdoor condenser unit positioned on concrete pad adjacent to brick structure. Performed standard maintenance protocol including inspection of condenser coils which showed accumulated dust and environmental debris on metal mesh panels, verified refrigerant line connections along exterior wall, and assessed overall unit operation. System utilizes 16x25x5 PURE AIR filters as specified for this installation.
Completed installation of two 96% efficiency upflow furnaces at the property. During the installation process, inspected and connected the delay-on-make timer (ICM102) to the control board, ensuring proper wiring configuration for staged heating operation. Verified all electrical connections to the main control board, including multiple low-voltage wiring terminations for thermostat control, safety circuits, and blower motor operation. Secured all wire bundles and confirmed proper routing to prevent interference with moving components. System tested and operational upon completion.
Completed installation of a 2-ton, 19 SEER heat pump system at residential property. Installed Lennox air handler unit in interior utility room with proper ductwork connections and filter compartment, and positioned outdoor heat pump condenser unit on concrete pad adjacent to home exterior with electrical disconnect box and all required connections completed per manufacturer specifications.
Conducted on-site evaluation and provided replacement estimate for 23-year-old residential air conditioning system. Assessed existing horizontal HVAC configuration including furnace placement, ductwork layout, and crawl space installation with insulated supply ducts. Documented system dimensions and existing infrastructure to develop comprehensive replacement specifications for new equipment installation.
Responded to service call for 10-month-old HVAC system to address three reported issues: improper air filter fit, noisy pump operation, and loud screeching noise. Verified air filter dimensions (16x25x4) and assessed fitment concerns in filter housing. Investigated condensate pump for abnormal noise and inspected blower motor and belt assembly for source of screeching sound.
Conducted on-site consultation and assessment for complete air conditioning system replacement. Evaluated existing 19-year-old AC unit and documented current system configuration, including interior return air vent location and existing thermostat control system with exposed wiring and circuit board components. Provided homeowner with equipment options and financing information for new system installation.
Completed full HVAC system installation including a 2-ton, 15.5 SEER Lennox air conditioning condenser unit positioned on exterior pad with proper clearances, and a 97% AFUE furnace with air handler installed in interior utility closet. All ductwork connections secured, condensate drain line and electrical conduit properly routed, system tested and verified operational to manufacturer specifications.
Completed installation of 2.5-ton, 15.2 SEER heat pump system with matching coil at residential property. Outdoor condensing unit was positioned on ground-level platform adjacent to building exterior, with proper electrical connections established through new disconnect boxes and conduit routed to existing meter base. System was installed per manufacturer specifications, tested for proper operation, and left in fully functional condition.
Responded to no cooling complaint on 7-year-old upstairs ductless mini-split system blowing room temperature air with frost accumulation on interior unit. Upon inspection, removed cover and accessed evaporator coil assembly to diagnose cooling loss. Found evidence of refrigerant flow restriction causing inadequate heat exchange and frost buildup on coil surfaces. Performed system diagnostics including temperature differential measurements and visual inspection of heat exchanger components. Identified airflow present but insufficient cooling capacity due to frost-restricted evaporator coil. Advised system defrost protocol and verified proper fan motor operation on black housing assembly.
Completed comprehensive replacement estimate for attic-mounted HVAC system with non-functional air conditioning unit. Assessed existing horizontal furnace and air handler configuration, documented ductwork layout including flexible duct runs and metal supply trunk, measured equipment dimensions and clearances for Rheem system replacement specification. Provided detailed equipment replacement proposal addressing failed cooling system while preserving operational heating components.
Completed comprehensive HVAC system evaluation for replacement estimate on fifteen-year-old air conditioning system. Documented existing equipment configuration including air handler unit with galvanized metal ductwork, copper refrigerant lines, and thermostat wiring setup. Photographed current installation showing metal supply plenum with curved elbow transition, existing control wiring with multiple zone connections at thermostat terminals, and overall system layout in basement utility area to provide accurate replacement specifications and equipment recommendations.
Responded to report of crackling and sparking noises from bathroom light switch. Upon arrival, inspected the double toggle switch installation and found compromised wiring connections within the electrical box. Removed wall plate to access the switches and identified arcing damage at wire terminations. Replaced faulty double switch assembly, secured all wire connections with proper torque specifications, and verified ground continuity. Tested both switch circuits under load to ensure proper operation without arcing or abnormal sounds. Reinstalled wall plate and restored power to bathroom lighting circuits. All electrical components now functioning safely within code specifications.
Conducted comprehensive HVAC system replacement estimate for residential property with existing outdoor condenser unit and downflow furnace configuration. Evaluated current system performance, documented equipment specifications including 52.5" furnace with evaporator coil assembly, assessed installation conditions including base structure integrity, and photographed existing outdoor unit placement adjacent to home exterior. Provided homeowner with complete replacement options for non-functioning system requiring full equipment upgrade.
Upon arrival, discovered the unit in question was a Navien tankless water heater system, not a traditional tanked water heater as originally requested. Explained to customer the difference between tankless and tanked water heater systems and that the scheduled flush service does not apply to this type of unit. Tankless water heaters require different maintenance procedures, including descaling and cleaning of the heat exchanger rather than a standard tank flush. Inspected the installation and confirmed all connections, gas line, water supply lines, and electrical connections were properly secured and functioning. System appeared to be in good working condition with no immediate maintenance concerns noted.
Conducted follow-up visit to address ongoing condensation issue in upstairs bedroom closet where exposed refrigeration line set has been causing daily moisture accumulation requiring towel changes. Assessed line set routing through closet and confirmed need for proper chase cover installation to prevent continued condensation problems. Coordinated with customer regarding scheduling for chase fabrication and installation work, with customer awaiting callback to confirm appointment date and time for completion of line set covering.
Responded to no cooling complaint on 5-year-old residential air conditioning system blowing room temperature air with 8-degree temperature differential between setpoint and actual room temperature. Upon arrival, confirmed adequate airflow at supply registers with no ice formation on evaporator coil or refrigerant lines. Performed comprehensive system diagnostics on outdoor condenser unit and associated components. Inspected condenser coil for debris and airflow obstruction, verified proper electrical connections at disconnect panel, and evaluated refrigerant line set connections at condensing unit. System evaluated for proper refrigerant charge, compressor operation, and capacitor function to identify root cause of loss of cooling capacity and restore proper system operation.
Performed comprehensive HVAC replacement estimate for residential property. Evaluated existing furnace and air handler system located in interior closet space, documenting current equipment configuration including ductwork connections, condensate drain lines, and spatial constraints. Assessed installation accessibility, measured available clearances for replacement equipment, and photographed existing system components to determine optimal replacement unit specifications and installation requirements.
Completed follow-up site visit to investigate and document reported water leak condition. Inspected HVAC system installation including refrigerant line insulation, condensate drainage routing, and air handler unit operation. Documented existing pipe insulation configuration with gray foam covering refrigerant lines secured with mounting straps in ceiling cavity. Verified air handler unit displaying 70° on digital readout and confirmed proper flexible duct connection to ceiling plenum. Photographed electrical wiring routing, safety switch mounting, and overall system component placement for service records. No active water leak observed at time of inspection; all insulated lines and connections appeared dry with no visible moisture damage to surrounding ceiling materials or equipment surfaces.