Midwesterners want common-sense solutions to HVAC issues. Elizabethtown, KY, property owners are no different. The A+ Derr Heating & Cooling family has provided Elizabethtown and Hardin County with superior HVAC service for over 50 years.
Indoor air quality, safety, and reliability are our priority. We’re always here for you if you need HVAC repair, replacement, or a tune-up. Our trained technicians use industry-best practices, and we guarantee our work. We guarantee our customer care, too.
Find out why Elizabethtown, KY, trusts A+ Derr heating, cooling, and IAQ for fast, dependable HVAC service. Call us at 833-232-4328 or contact A+ Derr online.

Comprehensive Air Conditioning
Cool, comfortable indoor air is vital to your quality of life. Air conditioning is necessary for health and safety in many homes. We offer the following services to ensure your home is cool and comfortable all year:
Be sure to ask about the health and environmental benefits of ductless air conditioning in Elizabethtown. We provide:
- Ductless mini-split installation/replacement
- Ductless mini-split maintenance
- Ductless mini-split repair
Energy-saving, high-quality heat pumps are a great way to save money while delivering comfortable air conditioning to Northern Kentucky and Southern Indiana homes. Our team offers heat pump maintenance and 24/7 heat pump repair.Don’t delay HVAC repair or replacement. To schedule an appointment, call us at 833-232-4328.
Top-Rated Heating
Most Elizabethtown homes were built in the 1990s. If your HVAC system is nearing the end of its life span (10-15 years) or showing signs of furnace problems, A+ Derr Heating & Cooling can offer energy- and money-saving options. Our heating services include:
There’s no heating system make or model we can’t service, especially furnaces and boilers. Ductless mini-splits are also great options for heating and AC systems.A+ Derr is the Elizabethtown geothermal heating expert:
IAQ Solutions
Clean, healthy indoor air quality has never been more important! Ozone- and particle-polluted air can cause health issues, and because we spend so much time inside, our indoor air quality makes a big difference in our quality of life. A+ Derr Elizabethtown IAQ services include duct cleaning and dehumidifiers. Our air purifiers are the best way to kill airborne pathogens, dust, pet dander, and pollen.Let us explain the benefits of cleaner, healthier indoor air in Elizabethtown, KY. Call 833-232-4328 or contact A+ Derr online today.
Why Choose A+ Derr?
Because we’re family owned and locally operated, it makes sense for our heating and cooling professionals to try harder for the best HVAC customer service. We live where we work! Check out why your neighbors choose A+ Derr Heating & Cooling.
Your HVAC is the most expensive system in your home, and regular maintenance can ensure it lasts longer. Every customer is a top priority, but our Maintenance Plan customers are at the top of our list in a weather-related crisis.
Our licensed, insured HVAC professionals take pride in what we do! To schedule an appointment, call us at 833-232-4328.
FAQs
Do Air Purifiers Get Rid Of Smoke Smells?
Not only will an air purifier remove smoke and smoky smells, but it will also eliminate the dangerous chemicals from your indoor air.
Why Won’t My AC Kick In?
If your air conditioning doesn’t come on, it may be a thermostat problem. Other reasons your AC won’t kick in are clogged filters or a condenser-related issue.
Recent Jobs and Reviews in Elizabethtown, KY
Job Locations and Reviews
Completed monthly platinum level maintenance on an 8-month-old HVAC system. Replaced 20x20x1 air filter and performed comprehensive system inspection. Utilized clamp meter to verify electrical parameters, recording amperage draw of 38.5 amps at the compressor and confirming proper voltage readings throughout the system. All electrical connections were tested and found to be secure with no abnormalities detected. System operational testing confirmed proper functionality of all components with performance within manufacturer specifications.
Performed comprehensive AC tune-up on 16-year-old cooling system experiencing slow cooling performance affecting entire home. Conducted thorough system diagnostics including temperature differential measurements across supply and return ducts, recording -8.5°F split at one measurement point and 155°F reading at another location. Inspected all accessible ductwork and insulation for proper installation and integrity. Evaluated system performance parameters to identify causes of inadequate cooling capacity. Completed standard preventive maintenance procedures including filter inspection, electrical connections check, refrigerant level assessment, and overall system operation verification. Observed customer's request for protective foot coverings throughout service visit. Documented findings with photographic evidence of diagnostic measurements and system components for service records.
Completed comprehensive HVAC replacement estimate for residential property with existing operational air conditioning system. Evaluated current outdoor condenser unit positioned on concrete pad against brick exterior, documenting equipment condition including weathered metal surfaces, aging components, and existing refrigerant line routing through black corrugated conduit. Assessed installation site conditions, electrical disconnect configuration, and drainage considerations for future system replacement planning.
Completed comprehensive estimate for full HVAC system replacement including outdoor condensing unit and indoor air handler. Assessed existing equipment configuration with heat pump system rated over 10 SEER, documented current installation with refrigerant line routing and ductwork connections, and provided replacement recommendations for complete system upgrade to higher efficiency equipment.
Responded to no cooling call on 14-year-old residential HVAC system. Upon arrival, verified thermostat operation and system status. Inspected condensate drain system and confirmed Safe-T-Switch secondary drain pan overflow safety device was properly installed and functioning. Performed diagnostic evaluation to identify cause of cooling failure and documented system condition with photos for service records.
Responded to service call for HVAC system experiencing short cycling with unit shutting off after approximately 15 minutes of runtime. Upon arrival, inspected 4-year-old air handler unit installed in basement utility area and performed diagnostic evaluation to identify cause of intermittent operation. Conducted comprehensive maintenance service including inspection of electrical connections, thermostat operation, condensate drainage system, and safety controls. Verified proper airflow, checked refrigerant levels, and tested system cycling to ensure unit maintains consistent operation without premature shutdowns. System restored to normal operating parameters with stable runtime and proper temperature control.
Completed second annual planned maintenance visit on dual HVAC system. Replaced air filters including 20x20x5 and 16x20x5 media filters on both units, which are now five years old. Performed comprehensive system diagnostics using electrical testing meter to verify proper voltage and amperage readings. Measured operating amperage at 49.9 amps on outdoor condenser unit, confirming equipment is running within normal parameters. Inspected all electrical connections, conduit, and disconnect boxes for proper operation. Both systems tested and operating efficiently with no issues identified.
Responded to service call for non-functional thermostat on newly installed HVAC system with no heating or cooling capability. Upon arrival, performed diagnostic assessment of thermostat wiring and system communication. Identified wiring issue preventing proper signal transmission between thermostat and air handler. Corrected wire connections at thermostat base and verified proper 24VAC power supply. Tested system operation in both heating and cooling modes to confirm full functionality restored. Inspected air filters and found them to be clean with adequate airflow. System now operating as designed with thermostat responding correctly to temperature adjustments and mode selections.
Completed Platinum Level planned maintenance on a 4-month-old single-system HVAC unit during the first annual visit. Performed comprehensive system diagnostics using digital multimeter on outdoor condensing unit, verified thermostat operation and calibration with unit displaying 76°F setpoint, and replaced 16x25x4 air filter. Conducted electrical testing with multi-lead connections to assess compressor performance, capacitor functionality, and overall system efficiency. Inspected refrigerant lines, conduit connections, and exterior unit condition. All components operating within manufacturer specifications with no issues identified during this initial scheduled maintenance visit.
Completed comprehensive HVAC replacement estimate for residential system experiencing refrigerant leak. Evaluated existing air handler unit located in attic space and assessed exterior condensing unit with associated refrigerant lines and electrical conduit mounted to building exterior. Documented current system configuration including ductwork connections, condensate drainage, and electrical service to provide accurate replacement specifications and equipment sizing recommendations.
Responded to no cooling complaint on 16-20 year old American Standard air handler system. Upon arrival, confirmed unit was running with adequate airflow through vents but no cooling output. Performed diagnostic evaluation of the system including inspection of the air handler unit and associated ductwork in the mechanical space. Assessed refrigerant levels, electrical components, and overall system operation. Documented equipment condition with measurements and photographs of the installation, including foil-faced insulated ductwork and air handler cabinet. System showed typical age-related wear consistent with equipment in this service life range. Provided assessment findings and repair recommendations to address the no cooling condition.
Completed monthly Platinum Level maintenance on a 5-year-old HVAC system. Replaced 16x20x5 air filter as part of routine preventive maintenance program. Inspected thermostat operation and verified proper temperature control settings with unit maintaining 70°F in cooling mode with fan set to auto. Accessed and inspected internal control panel, circuit board, capacitor, and electrical connections to ensure all components were functioning correctly with no signs of wear or damage.
Responded to callback for AC system not cooling following recent thermostat replacement. Found outdoor unit fan not operating while indoor blower ran continuously. Diagnosed failed outdoor fan motor and capacitor. Replaced defective components under warranty, restored proper system operation, and verified cooling performance with supply air temperature of 50.5°F and return air temperature of 71.6°F, confirming adequate temperature split and proper refrigerant cycle operation.
# HVAC Replacement Estimate Report Completed comprehensive replacement estimate for residential HVAC system at customer's request. Homeowner present during evaluation as required for replacement consultation. Customer indicated current system is non-operational and specifically requested replacement options only, declining repair assessment. Conducted thorough inspection of existing outdoor air conditioning condenser unit and indoor air handler components. Exterior condenser unit exhibits significant age-related deterioration with visible weathering, dirt accumulation on protective grilles, and general wear consistent with end-of-service-life equipment. Unit positioned on concrete pad adjacent to structure with standard electrical conduit connections. Interior inspection revealed aging heat exchanger coil assembly with visible discoloration, dust buildup, and signs of extended operational wear. Examined control board, wiring connections, and drip pan assembly within cabinet compartme
Diagnosed and serviced 3-year-old Amana heat pump system experiencing delayed heating response in upstairs unit. Inspection revealed heat strips were not activating properly, causing approximately one hour delay between heat pump operation and auxiliary heat engagement. Cleaned debris from outdoor unit, verified proper operation of downstairs system, and adjusted control board settings to ensure timely activation of heat strips when temperature differential requires supplemental heating.
Completed annual maintenance on 1-year-old HVAC system as part of Platinum Level service plan (2nd visit). Performed electrical testing on control board components using multimeter, confirming proper voltage readings. Inspected outdoor Lennox condensing unit, verified proper operation, and addressed customer's concern about the exhaust line - no damage was found.
Completed monthly platinum maintenance service on 13-year-old system. Verified Nest thermostat functionality and proper heat operation at 66°F setpoint. Performed electrical diagnostic testing with multimeter, confirming proper voltage readings at 13.6V. Replaced 20x20x1 filter as scheduled.
Conducted site assessment for propane generator installation, evaluating existing electrical infrastructure including 200A service panel with approximately 20-24 circuit breakers. Customer requires generator estimate for backup power system and previously inquired about HVAC solutions for two bedrooms. Documented panel configuration and load distribution to determine appropriate generator sizing and transfer switch requirements.
Conducted follow-up inspection of previously rerun exhaust system after customer reported water leakage into attic from cut PVC pipe left during initial service. Visual examination of the attic space confirmed presence of disconnected PVC pipe sections near the black insulated ductwork, resulting in condensation accumulation. Properly sealed and reconnected the PVC pipe to eliminate the leak source.
Responded to customer complaint regarding auxiliary heat malfunction. Inspection revealed excessive runtime alerts on the ecobee thermostat system, indicating potential control or relay issues. After examining the control panel wiring and connections, repaired faulty auxiliary heat relay and reorganized crossed wiring to restore proper heat sequence operation.