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
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.
Performed semi-annual tune-up on 1-year-old HVAC system for platinum member. Replaced existing BAM 16x25x4 air filter with new Koch filter. Inspected and serviced ignition system components, including examination and testing of the ceramic igniter assembly.
Conducted follow-up site visit to complete previously unfinished HVAC installation work. Accessed crawl space to evaluate PVC piping, insulated ductwork, and electrical components for the pending condensate pump installation and AC wiring connection. Will return to complete the installation once all necessary materials are available.
Performed monthly maintenance on a 7-year-old 16x20x5 HVAC system. Conducted temperature differential testing showing 28.5°F reading and measured system amperage at 6.79 amps with clamp meter. All readings within normal operating parameters for platinum maintenance plan service.
Completed installation of new RED complete HVAC system in basement area. Conducted full system level verification using spirit level to ensure proper unit orientation. Performed comprehensive CAM check on unit with proper connections to existing ductwork. Documented installation with photos showing proper mounting and alignment of system components.
Responded to customer complaint of constant loud humming noise from Coleman HVAC system. Upon inspection of the 4-year-old unit, identified and resolved vibration issues within the air handler assembly. System is now operating at normal noise levels while maintaining proper heating function at 74°F setpoint.
Completed follow-up service call to address failed inspection items. Installed required Safety T-Switch and PVC cap on condensation line to bring system into compliance with inspection requirements. System should now meet all inspection criteria for property closing.