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 comprehensive assessment of 16-year-old HVAC system for residential property exceeding 2200 square feet with heating and cooling equipment located in interior closet. Evaluated existing Lennox natural gas furnace and outdoor condensing unit, both showing age-related wear consistent with end-of-service-life equipment. Documented current system configuration including ductwork, air handler, and electrical disconnect. Prepared two replacement options per customer request: first option for air conditioning system replacement only, second option for complete furnace and air conditioning system replacement. Conducted thorough equipment inspection, captured photographic documentation of indoor and outdoor components, and provided detailed specifications for replacement equipment suitable for large-footprint residential application with natural gas energy source.
Completed planned HVAC maintenance on dual system setup including mini-split unit located in workshop area. Noted need to return with pump-up pads for installation beneath outdoor mini-split condenser unit on next scheduled heating maintenance visit. Washable filter maintenance required on mini-split system during follow-up service call.
Completed follow-up visit for previously installed thermostat where initial maintenance work remained outstanding. Verified smart thermostat installation and configuration, confirmed Wi-Fi connectivity to SpectrumSetup-3D network, validated system settings interface functionality, and ensured automatic updates feature enabled and operational for proper system performance.
Returned to site to complete financing process for indoor air quality equipment that was not finalized during original planned maintenance visit. Successfully processed and submitted credit application, which received approved status for equipment financing with established payment terms and credit limit.
Completed Platinum Level annual maintenance on single-system HVAC unit with customer authorization to service outdoor equipment prior to arrival. Performed comprehensive inspection of outdoor condenser unit including electrical control board, capacitor, wiring connections, and fan assembly. Verified system level, inspected all electrical components and wire terminations, documented equipment condition with photos, and replaced 20x20x5 air filter. All components found operating within normal parameters and system left in proper working condition.
Completed Platinum Level annual maintenance on residential HVAC system and mini-split unit in shop area. Performed comprehensive inspection of newly installed system, including verification of thermostat connectivity status showing Venstar v5d thermostat properly connected to Wi-Fi network with confirmed communication to all system components. Installed new 20x25 air filter in main air handler unit and documented installation with tracking label. Inspected internal cabinet components, ductwork connections, and galvanized metal elbow joints for proper installation and operation. Cleaned and serviced mini-split unit located in shop as requested. All equipment operating within normal parameters with confirmed wireless connectivity and system communication functioning properly.
Responded to service call for non-functioning air conditioning system requiring replacement estimate and second opinion. Upon arrival, conducted thorough assessment of existing HVAC equipment and infrastructure. Inspected current thermostat installation, identifying Nest smart thermostat with multi-stage system wiring including Y1, Y2, G, OB, RC, W1, W2, C, and RH terminals properly connected. Evaluated existing ductwork connections and condensate drain line configuration in mechanical space. Documented equipment clearances and measured available installation space for replacement system sizing considerations. Photographed thermostat wiring configuration to ensure proper compatibility with replacement equipment specifications. Assessed mechanical room layout and existing pipe connections to determine optimal replacement unit positioning. Reviewed system requirements and discussed replacement options with homeowner based on current equipment failure and home comfort needs. Provided prof
Completed comprehensive HVAC system replacement estimate for residential property with non-functioning existing equipment. Assessed current furnace/air handler unit located in interior utility closet, evaluated existing ductwork configuration, and documented copper refrigerant line routing and ventilation infrastructure. Performed detailed site inspection including measurement of installation space, examination of electrical service requirements, and assessment of existing supply and return air distribution system to provide homeowner with complete replacement system specifications and options.
Installed a 50-gallon State Water Heaters ProLine commercial-grade water heater in utility room with complete plumbing connections, gas line hookup, and proper venting. Unit includes 6-year parts warranty and 1-year labor warranty, with all connections secured to code and system tested for proper operation.
Completed planned maintenance on 2-year-old residential air conditioning system. Performed system diagnostics using digital manifold gauges, measuring refrigerant pressures and temperatures to verify proper operation. All readings within manufacturer specifications, and unit operating as designed per seasonal conditions.
Conducted comprehensive replacement estimate for aging HVAC system including 25-year-old furnace and older air conditioning unit. System currently operational but nearing end of service life. Documented existing equipment configuration including ceiling-mounted return air vent showing significant dust accumulation and digital thermostat displaying heat mode operation at 74 degrees.
Conducted comprehensive HVAC system replacement estimate for non-operational residential heating and cooling equipment. Evaluated existing furnace/air handler unit located in interior mechanical closet and outdoor condensing unit positioned on exterior concrete pad against brick foundation. Assessed current system configuration including ductwork connections, refrigerant line routing, electrical service requirements, and overall installation conditions to provide homeowner with replacement options and specifications for new equipment installation.
Provided estimate for temporary removal and reinstallation of main HVAC trunk line from crawlspace to allow foundation contractor access for repairs. Documented measurements and current configuration of flexible ductwork routing beneath structure, including approximately 15-19 inches of clearance requirements and connection points to existing system for proper reassembly upon completion of foundation work.
Completed annual planned maintenance on residential HVAC system utilizing 20x25x5 filter. Performed comprehensive system inspection and temperature diagnostics, recording supply air temperature of 57.5°F and return air temperature of 192°F. System operating within normal parameters for first annual maintenance visit since installation.
Completed first annual Platinum Level maintenance on a 1-year-old HVAC system. Replaced 16x25x5 filter, performed comprehensive system inspection, and recorded temperature differentials with supply air at 53.5°F and return air at 70.5°F, confirming proper system operation and cooling performance within manufacturer specifications.
Responded to no cooling call on residential system aged 5-10 years. Upon arrival, verified system would not respond to thermostat calls for cooling, though unit could be manually forced on at equipment. Confirmed thermostat had been recently replaced by homeowner with issue persisting. Performed diagnostic evaluation of thermostat wiring and control circuit between indoor air handler and outdoor condensing unit. Identified faulty low-voltage wiring connection and control board communication failure preventing proper thermostat signal transmission. Repaired wiring connections, tested control board functionality, and restored proper communication between thermostat and HVAC equipment. Cycled system through multiple cooling calls to verify proper operation. System now responding correctly to thermostat commands with outdoor unit engaging on demand and delivering conditioned air through ductwork.
Completed Gold Level annual planned maintenance on a 1-year-old single HVAC system during the first scheduled visit. Performed comprehensive inspection of the outdoor condenser unit, verifying proper operation of the fan assembly and examining exterior panels for airflow restrictions. Conducted diagnostic testing using digital measurement equipment on the HZ322 control unit and zone controller, confirming all terminal connections were secure and system indicators showed proper operation. Verified thermostat display functionality showing accurate temperature readings at 53°F. Inspected extensive wiring bundles at terminal blocks for proper connections and secure terminations. All system components operating within normal parameters with no deficiencies noted requiring immediate attention.
Completed first visit of planned HVAC maintenance requiring 3-month service interval with 16x25x5 filter replacement. Performed diagnostic testing of system controls using dual port manometer, recording pressure readings of 16.9 on both ports to verify proper system operation. Inspected ECM drive control board and verified all wire connections at terminal blocks, confirming electrical components and circuitry functioning within normal parameters. Customer will reschedule for completion of remaining maintenance tasks.
Completed first annual planned maintenance visit on 2-year-old HVAC system under Gold Level service agreement. Performed comprehensive system inspection including electrical diagnostics of control board circuitry using digital multimeter to verify proper voltage and component operation. Tested all terminal connections, capacitors, and integrated circuits to ensure optimal system performance. Replaced 20x25x5 air filter and documented system condition through photographic records of control board and electrical components for maintenance history.
Completed installation of 12,000 BTU ductless mini-split system in commercial sewing shop workspace. Mounted indoor air handler unit on interior wall between windows for optimal air distribution, installed outdoor condensing unit, ran refrigerant lines and electrical connections, and tested system operation to verify proper cooling performance.