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
Successfully installed a complete 2.5 ton, 15.5 SEER Amana HVAC system in the utility closet of the residence, including proper connection of ductwork with reflective insulation and PVC ventilation piping. System includes new air return vent installed on interior wall with all components verified operational.
Successfully completed installation of Generac residential backup generator system on concrete GenPad with proper electrical connections. Installed conduit from generator to house and connected to transfer switch panel mounted on exterior wall. All connections tested and system verified operational per manufacturer specifications.
Successfully installed an 18 KW Generac standby generator on a concrete pad adjacent to the client's residence. Unit was properly positioned and secured on the exterior patio area, with all connections made according to manufacturer specifications. Generator was sold by Brookman in Owensboro.
Conducted comprehensive HVAC replacement estimate for non-functioning A/C system at customer's residence. Inspection revealed aging outdoor unit with deteriorating concrete pad and electrical connections, along with dust-laden indoor evaporator coil showing signs of wear. Customer specifically requested replacement options only, declining repair alternatives.
Conducted site assessment for natural gas generator installation. Inspected existing gas meter connections and electrical panel. Evaluated optimal placement location in backyard, considering proximity to utilities, AC unit positioning, and clearance requirements for proper ventilation and maintenance access.
Completed installation of a new Lennox 2.5-ton, 15.5 SEER complete HVAC system, which included positioning the outdoor condensing unit on a concrete pad and connecting the necessary refrigerant lines and condensate drain. System startup verification confirmed proper operation with discharge air temperature at 76.4°F as measured at the supply register.
Performed annual maintenance on a 12-15 year old residential HVAC system. Inspected and cleaned the return air grille, confirming proper airflow and ventilation. System is functioning within normal parameters despite its age; recommended continued regular maintenance per Gold Level service agreement.
Performed preventative maintenance on generator system with Evolution 2.0 controller. Calibrated control panel offset parameter to 133 and verified proper voltage readings of 120.7V DC using clamp meter. Unit functioning correctly but will require renewal in June 2025; customer has been advised to schedule accordingly.
Conducted comprehensive HVAC replacement estimate for aging but functional system. Inspected utility closet containing existing furnace with connected ductwork and adjacent water heater with expansion tank. Customer is a returning client seeking replacement options only, no repair alternatives requested.
Performed a complete maintenance flush on an A.O. Smith tankless water heater to remove mineral buildup and ensure optimal performance. The system was thoroughly cleaned using manufacturer-recommended procedures, and all connections were inspected for proper function. Documentation was applied to the unit indicating the service date, and the water heater was confirmed to be operating efficiently after maintenance was completed.
Conducted a comprehensive site assessment for a generator installation at a residence with a 200 amp breaker panel and natural gas availability. Documented existing electrical infrastructure, including meter location and surrounding clearances. Evaluated optimal placement options considering proximity to gas supply, electrical panel, and code-required setbacks from openings and combustibles.
Performed Platinum Level maintenance on 1-year-old system. Replaced capacitor (part #G761004453C) during first annual visit. Installed new 16x25x5 filter and documented system condition with photos. Next maintenance scheduled for 9/2025.
Completed Platinum Level maintenance service on one HVAC system. Inspected and documented condition of floor registers showing significant rust/dirt accumulation and aging. Noted electrical connections and vent positioning for proper airflow distribution throughout the space.
Successfully installed a new 50-gallon short yellow gas water heater with proper venting and copper connections. Mounted a blue expansion tank to the wall and ensured all piping was correctly fitted. System was tested and verified to be functioning correctly with no leaks detected.
Successfully installed a new Lennox HVAC complete system, consisting of an outdoor condensing unit mounted on a proper pad against the exterior brick wall and an indoor furnace unit positioned in the utility closet. All components were properly connected with appropriate ductwork, electrical connections, and refrigerant lines, ensuring optimal system performance and efficiency.
Conducted a comprehensive replacement estimate for converting an aging Arcoaire HVAC system to natural gas. Inspection revealed weathered outdoor AC unit installed on gravel base with visible weathering and discoloration. Interior mechanical room houses current water heater and HVAC equipment on partially finished flooring (transition between hardwood and OSB subflooring), indicating potential space considerations for new system installation.
Conducted comprehensive assessment for multiple HVAC replacement options at residential property with existing Ruud Silhouette II furnace, Carrier indoor unit, and Bryant outdoor condensing unit. Evaluated potential solutions for extending HVAC service to unconditioned sunroom and garage spaces, while also examining water heater replacement requirements (A.O. Smith GVR 50 300) and backup power generation needs.
Conducted comprehensive HVAC replacement estimate for aging but functional system, taking precise measurements of the existing outdoor unit and examining its placement relative to the home's exterior features. Documented the current installation configuration with photographs to ensure accurate sizing recommendations for the replacement system.
Performed annual platinum level maintenance on single HVAC system. Inspected control board connections and verified proper communication between indoor and outdoor equipment components. Checked system for proper leveling to ensure optimal operation, noting furnace installation date of 11/21/25 during first maintenance visit.
Completed warranty service call for HVAC system requiring replacement drain pan (part #0270A01031S). Identified unit by equipment ID 4A00052, documented condition with photos, and submitted follow-up request for part ordering with green priority status as system remains operational. No additional helper was required for this service.