Welcome to A+ Derr Heating & Cooling, your trusted source for all your HVAC needs in Jeffersontown! We aim to provide top-quality services and products to keep your home comfortable and healthy all year round. At A+ Derr, our clients deserve the best, so we prioritize customer satisfaction above everything else. Our team of highly skilled professionals has provided exceptional HVAC services to Jeffersontown since 1975, and we’re proud to continue providing expert solutions to our clients. Ready to get started? Contact A+ Derr today at (877) 914-1764 in Jeffersontown to schedule an appointment.

Air Conditioning
Keeping your home cool and comfortable during the hot Jeffersontown summers is essential for your comfort and well-being. At A+ Derr, we provide top-quality air conditioning solutions to help you beat the heat.
We offer a range of air conditioning services, including:
- AC repair: Our team of experts can quickly identify and resolve any AC issues you may face.
- AC replacement: If your air conditioner is beyond repair, we’ll help you choose a new one that fits your budget and needs.
- AC maintenance: Proactive maintenance is the best way to ensure your AC stays in optimal condition, and we provide comprehensive tune-ups that will keep your unit running efficiently.
- Ductless air conditioning: If you don’t have ductwork in your home, we offer ductless AC systems that provide efficient cooling solutions without requiring ducts.
No matter what your AC needs are, we’ll provide reliable and affordable solutions you can trust. Contact A+ Derr today at (877) 914-1764 in Jeffersontown to book an appointment.
Heating
Winter in Jeffersontown can be brutal, but with A+ Derr’s top-quality heating solutions, you can stay warm and cozy indoors no matter how low the temperatures drop. We provide a range of heating services, including:
- Furnace repair and installation: Our experts can quickly diagnose and fix furnace issues or help you choose a new furnace that suits your needs.
- Boiler repair and installation: If you have a boiler, we can help keep it running efficiently and reliably.
- Heat pump repair and installation: Heat pumps are an energy-efficient heating solution that can save you money on your heating bills.
- Maintenance: Regular maintenance can prevent issues and extend the life of your heating system.
We’ll provide the best heating solutions that fit your unique requirements.
Indoor Air Quality Solutions
Indoor air quality is often overlooked, but it’s essential for your health and well-being. At A+ Derr, we provide a range of indoor air quality solutions that can help you breathe easier and avoid allergens and pollutants.
- Duct cleaning: Dirty ductwork can harbor harmful contaminants, which can circulate throughout your home. Our experts can clean your ducts and improve your indoor air quality.
- Humidifiers: Dry air can cause various health issues, including dry skin, respiratory problems, and allergies. We offer humidifiers to help you keep your home’s humidity levels in check.
- Dehumidifiers: High humidity can also cause problems, including mold growth and respiratory issues. We offer dehumidifiers to help you keep your home’s humidity levels in check.
- Air purifiers: Air purifiers can eliminate pollutants and allergens from your home, giving you cleaner, healthier air.
No matter your IAQ needs, we’ll provide practical solutions to help you maintain optimal indoor air quality. Call us at (877) 914-1764 in Jeffersontown to make an appointment.
Why Choose A+ Derr?
If you’re looking for a reliable HVAC company in Jeffersontown, look no further than A+ Derr. Our family-operated business has served the community for four generations with our 24/7 service. One unique aspect of A+ Derr’s services is our “Service Today, or You Don’t Pay!” guarantee. Our commitment to customer satisfaction is evident in our free estimates for replacement quotes and service calls. With A+ Derr, you can trust that your home’s comfort is our top priority.Contact us today at (877) 914-1764 in Jeffersontown to schedule an appointment.
Recent Jobs and Reviews in Jeffersontown, KY
Job Locations and Reviews
Completed follow-up site visit to inspect and document previously incomplete HVAC installation work. Photographed mechanical room equipment including furnace/boiler unit with visible manufacturer labels, warning decals, gas connections with brass fittings and yellow tag, copper tubing, PVC condensate drain line showing discoloration, and associated plumbing components to verify installation status and identify remaining work requirements.
Responded to install callback for Lennox furnace system with fan running continuously but no heating or cooling output. Upon inspection, diagnosed faulty control board preventing proper system operation and heating/cooling cycles. Replaced defective control board, verified all wire connections, tested system operation through complete heating cycle, and confirmed proper fan cycling and temperature control restored to normal function.
Installed a new 40-gallon tall gas water heater manufactured by Bradford White in the utility closet. Connected copper supply lines with dielectric unions to prevent galvanic corrosion, installed proper shut-off valves including gas isolation valve, and vented the unit with galvanized metal flue pipe per code requirements. All plumbing connections were tested and verified leak-free, and the unit was commissioned successfully.
Completed comprehensive HVAC system evaluation for heat pump replacement estimate at residential property. Performed refrigerant leak detection assessment on primary heat pump system and conducted full inspection of secondary garage unit. Documented equipment specifications and measurements of existing Carrier furnace unit and Bradford White water heater (dated 2-10-15) to determine replacement requirements and clearance specifications. Provided detailed replacement estimate with equipment recommendations based on current system age and operational status.
Performed comprehensive refrigerant check and leak detection on residential Payne heat pump system. Connected manifold gauge set to outdoor condensing unit and verified system pressures and refrigerant charge levels. Conducted visual inspection of unit, line set, and connections for signs of refrigerant leakage. System found to be operating within normal parameters with no leaks detected at time of service.
Completed PTAC unit replacement at property. Removed existing unit and installed new PTAC system, verifying proper electrical connections and refrigerant line integrity. Performed temperature differential measurements across the unit using calibrated digital instruments, confirming supply air temperature of 91°F and proper system operation upon startup.
Responded to bathroom sink clog complaint and successfully cleared the drain obstruction. Upon inspection, found standard P-trap configuration with chrome two-handle faucet assembly; noted aging fixtures with visible corrosion on supply valves and general wear throughout plumbing components. Restored proper drainage function and completed service.
Completed follow-up maintenance visit to verify system performance after previous service call. Performed diagnostic testing on HVAC unit, including capacitor testing with multimeter to confirm proper electrical function and system charging levels. Verified thermostat operation showing system actively cooling from 78°F to setpoint of 75°F. Confirmed unit running properly with all components functioning as designed.
Evaluated 12-year-old wall unit with no cooling capability. Performed measurements and assessment of existing HVAC equipment, documented condensation present on ductwork and metal surfaces indicating temperature differential issues. Provided estimate for complete system replacement due to age and failure of cooling function.
Successfully completed installation of a humidifier, connecting the water supply line to the existing plumbing system. Installed a quarter-turn shut-off valve with braided stainless steel supply line and secured proper connection of blue flexible feed line to the humidifier unit. All connections were tested and verified for proper operation with no leaks.
Successfully installed RED Full System with Polarized Filter, including proper leveling of all components according to manufacturer specifications. Mounted outdoor condenser unit on appropriate pad with proper clearances, connected insulated refrigerant lines, and secured all electrical connections to junction boxes. Verified system operation and ensured all components were functioning correctly before completion.
Replaced 15+ year old inoperative heating system with new XE 90 furnace installation in basement utility area. Complete system replacement included new ductwork connections, PVC venting, and integration with existing humidifier. Installation verified proper function of all components with comprehensive testing of the new heating system.
Diagnosed no-heat condition on 15+ year old HVAC system. Performed comprehensive inspection of aging equipment, including thermostat functionality check and outdoor unit assessment. Recommended replacement due to system age and wear patterns observed on condenser components.
Performed comprehensive tune-up on residential HVAC system, including inspection of outdoor AC condenser unit and furnace/air handler in utility room. Cleaned condenser coils, checked refrigerant levels, verified proper electrical connections, and inspected gas line connections to ensure safe operation. All components functioning within normal parameters; system is now operating at optimal efficiency.
Performed scheduled platinum-level maintenance service on a Goodman HVAC system, which included inspection of the blower motor assembly, verification of electrical connections (yellow, red, blue, and white wires), and examination of control board functionality. Documented system components with photos for service records and confirmed proper operation of all mechanical parts; system is functioning within specifications.
Completed Platinum Level maintenance on residential HVAC system. Replaced 16x25x1 filter as part of monthly service plan and performed temperature differential testing to verify proper system operation. System is functioning within normal parameters.
Diagnosed 5-year-old Trane HVAC system with complete non-operation and no airflow. Inspection revealed failed circuit board causing system failure. Replaced control board and verified proper system operation, restoring heat to downstairs zone.
Responded to no heat call for 2-year-old system where homeowner reported thermostat set to 72°F with home temperature at 59°F and no airflow. Diagnostic inspection revealed tripped circuit breaker; reset breaker and verified proper operation of gas burners and control board. System now functioning normally with consistent blue flame pattern and proper airflow throughout home.
Conducted generator installation assessment at residential property with natural gas availability. Evaluated electrical service panel in basement/utility area for generator integration capability. Customer requires backup power for critical loads including HVAC, refrigerator, TV, and essential lighting circuits in living room, kitchen and bedrooms.