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
Conducted on-site evaluation for potential ductless mini-split system installation to serve nine office spaces within a church facility. Assessed existing electrical infrastructure including main breaker panel to determine capacity and compatibility for proposed multi-zone ductless HVAC system, documented current electrical distribution for future installation planning.
Completed comprehensive replacement estimate for non-operational residential HVAC system requiring both heating and cooling equipment replacement. Assessed existing outdoor condensing unit with protective fencing and evaluated current thermostat wiring configuration including multi-wire connections at terminal points. Documented equipment specifications, reviewed installation requirements, and provided homeowner with complete system replacement options for both air conditioning and heating components.
Responded to a no-cool complaint on a Trane air conditioning system with inadequate cooling performance. Upon inspection, found the outdoor condenser unit with restricted airflow due to excessive vegetation growth and debris accumulation around the unit and within the coil fins. Cleared overgrown plants, vines, and organic matter from around the condenser base and perimeter, then cleaned the condenser coil to restore proper airflow and heat transfer efficiency.
Completed comprehensive HVAC system replacement estimate for residential property with non-functioning existing equipment. Evaluated current outdoor condensing unit and associated ductwork installation, including vertical metal chase and existing concrete pad placement. Assessed natural gas meter location and utility connections for compatibility with replacement system requirements, documented site conditions including siding clearances and electrical service access, and provided homeowner with detailed replacement options during scheduled consultation.
Conducted follow-up site visit to assess gas line relocation requirements for pending power humidifier installation. Documented existing HVAC system configuration including air handler unit, copper gas piping with shutoff valves, and PVC condensate drainage system in attic space to determine necessary modifications for completing humidifier integration.
Completed full HVAC system installation including a 3-ton Lennox unit with 23.5 SEER rating and 99% efficiency furnace, mounted in utility closet with proper ventilation and clearances. Installed powered humidifier integrated with new system, ran white PVC condensate drainage lines with appropriate pitch and connections, and added supply ventilation ductwork. Water heater was relocated and reconnected with copper supply lines and PVC venting to accommodate new HVAC equipment placement. All components secured with proper mounting brackets, piping labeled and routed efficiently through mechanical space, and system tested for proper operation and airflow.
# HVAC Installation Completed Successfully installed a 9,000 BTU ductless mini-split air conditioning system in a covered outdoor patio area. The installation included mounting the indoor evaporator unit on the brick wall, running refrigerant lines concealed in white PVC line cover, establishing proper drainage, and completing all electrical connections to code. System was tested and verified operational upon completion.
Responded to no cooling complaint on 5-year-old residential HVAC system with adequate airflow but insufficient cooling and suspected outdoor compressor failure. Diagnosed defective evaporator coil requiring replacement under warranty coverage. Ordered replacement evaporator coil and scheduled follow-up appointment for installation with estimated 4-hour repair time.
Conducted comprehensive HVAC system replacement estimate for homeowner concerned about mold and seeking complete ductwork relocation to attic from current location. Evaluated existing electrical panel, thermostat wiring configuration, and current system operation to determine requirements for new equipment installation and ductwork modification. Documented electrical infrastructure and HVAC control wiring to assess compatibility with proposed high-efficiency replacement system and relocated ductwork layout.
Responded to service call for second opinion on 6-year-old system blowing warm air with previous diagnosis of failed compressor. Upon inspection, discovered extensive mold and biological contamination on air handler cabinet and internal components, including evaporator coil assembly. Contamination indicated prolonged moisture exposure and inadequate drainage. Assessed compressor operation and refrigerant system functionality. Documented severe equipment deterioration with photographic evidence showing heavy mold growth on cabinet surfaces, wiring, and refrigeration lines. Provided homeowner with accurate diagnosis and recommended remediation options for contaminated equipment beyond initial compressor concern.
Completed installation of two toilets in residential bathroom. Performed associated electrical work to accommodate bidet functionality, including installation of electrical outlet near toilet fixture. Verified proper water supply connections, secure mounting, and tested flush mechanisms for optimal performance. Electrical components installed to code specifications to support bidet operation.
Completed follow-up site visit for generator electrical transfer switch installation under permit #20260499. Documented existing electrical service configuration including meter housing, junction box, and main electrical panel mounted on exterior brick wall. Photographed current setup to verify specifications for required 100 amp transfer switch installation, with equipment ready for next phase of work.
Installed 50-amp generator inlet with appropriate circuit protection at main electrical panel. Verified proper breaker sizing and panel capacity to safely accommodate emergency power transfer system for residential backup power application.
Performed diagnostic inspection on HVAC system in response to ceiling water leak occurring during system operation. Identified damaged and clogged air filter with multiple tears causing condensate drainage issues. Replaced filter, cleaned drain line, and verified proper system operation with no further leakage.
Successfully installed two new supply runs with properly insulated ductwork in attic space. Positioned and secured HVAC ducting between ceiling joists using appropriate metal brackets, ensuring optimal airflow throughout the structure. Visual inspection confirmed correct installation with all components properly sealed and insulated.
Completed annual Gold Level maintenance on 10-year-old HVAC system. Inspected furnace operation, checked connections, and examined ventilation system including PVC pipes and P-trap configuration. System is functioning properly with no immediate concerns; customer declined renewal at this time.
Performed diagnostic assessment on 2-year-old HVAC system after customer reported reduced airflow throughout the home following installation of new registers. Visual inspection of vents confirmed restricted airflow despite system otherwise maintaining temperature requirements. Determined airflow issue was directly related to recently installed register design being incompatible with the system's specifications.
Responded to warranty service call for no heat issue on a 2-year-old system. Diagnosed ignition circuit failure indicated by control board error message. Identified faulty inducer motor, main control board, and pressure switches requiring replacement. System currently non-operational with 66°F indoor temperature despite 70°F thermostat setting.
Completed first visit of Gold Level annual maintenance on single system. Inspection revealed significant dust accumulation on evaporator coil fins and extensive buildup in air ducts that could restrict airflow and reduce system efficiency. Thoroughly cleaned components, documented condition with photos, and noted system is approaching recommended cleaning interval with next scheduled maintenance due 11/2025.