Your Trusted Home services Company Since 1975
A family-operated company based in Louisville, A+ Derr Heating & Cooling has proudly served the Louisville community for half a centruy. Our decades of experience have equipped us with the skills and tools necessary to solve all of your HVAC and plumbing needs. Our comprehensive heating and cooling services will bring you the solutions you need to stay at a comfortable temperature in your home year-round, and our expert plumbing services will ensure everything flows without disruption. For A+ service, choose A+ Derr! Contact us today to schedule heating, air conditioning, or plumbing services in Louisville.
Air Conditioning Services
Don’t let the summer heat turn your home into an oven! Our team is highly trained to address all of your AC needs, whether for routine maintenance, a complex repair, or a complete system replacement. You can count on our friendly technicians to ensure your home is cool even when the temperatures start to soar outside. Our air conditioning services in Louisville include:
Signs You Need AC Repair
The sooner you can schedule air conditioning repairs, the better. When left unaddressed, problems will only worsen and can cause damage to other parts of your AC unit. Quick action can prevent further issues, so call our team for AC repairs as soon as you notice any of the following signs:
- Lack of airflow/problems with startup
- Lack of cool air
- Leaks
- Loud noises
- Off-putting odors
- Unusually high utility bills
Heating Services
At A+ Derr, your comfort is our top priority, so we don’t want you to be freezing in your own home. If your furnace is on the fritz or you need a heat pump installed, our team has you covered! We’re even available 24/7 if your furnace goes out in the middle of the night. Our comprehensive heating services include:
Signs You Need Furnace Repair
Some signs that your furnace isn’t working as it should are obvious, such as a complete lack of heat. Others may not be, so here’s what to look out for:
- Insufficient heating
- Short-cycling (i.e., unit turning on and off quickly)
- Burning smells
- Loud noises, such as banging, whirring, buzzing, etc.
- Unexplained rise in energy bills
Indoor Air Quality Solutions in Louisville
A+ Derr wants to ensure you can breathe easily in your home, so we offer whole-home air quality solutions for your benefit. If you’ve noticed that you have worsening allergy or asthma symptoms, dry skin, itchiness, or are becoming ill more frequently, it’s time to take steps toward improving your air quality. Contact A+ Derr for the following air quality services in Louisville:
Plumbing Services
Plumbing problems can quickly disrupt your day and cause chaos in your home. Fortunately, A+ Derr is ready to help with your plumbing issues, no matter how big or small! Our highly trained and friendly plumbers provide a wide range of plumbing services in Louisville, including:
- Plumbing repair
- Plumbing installation
- Plumbing maintenance
- Water heater repair
- Water heater installation
- Tankless water heater service
- Sump pump installation
- Sump pump repair
- Drain cleaning
- And more
Louisville Customer Experiences
At A+ Derr, we put our values of professionalism, punctuality, quality, responsiveness, and value into everything we do. We believe in always providing the best customer experience, from our friendly technicians to our top-notch HVAC services. But don’t just take our word for it! Read these reviews from your fellow Louisville residents that show why working with us is an A+ experience:
- “Absolutely love A+ Derr! They were extremely professional from the start, and explain everything thoroughly. Always answers any questions that I have. Best part is they send you a picture of the tech that is coming to your house. I think that is amazing, so you know who is coming that way you know beforehand. Definitely a great safety measure. 100% satisfied with this company. Would recommend to anyone.”
- “Used this company to replace our HVAC system and for maintenance. They provide top notch service and equipment at a reasonable price! Technicians have all been friendly and answered all my questions. I recommend them to family, friends and clients in need of their services.”
- “I purchased my new energy efficient unit from A+ Derr over 3 years ago. They have always been professional, on time, and provide excellent quality service. They have always been straight forward with me from day one. I did my research before selecting A+ Derr, and very happy that I chose the right company the first time.”
Why Choose A+ Derr Heating & Cooling?
Since 1975, A+ Derr Heating & Cooling has provided the HVAC and plumbing solutions that Louisville families need to stay comfortable in their homes. As a fourth-generation, family-operated company, we always put the customer first. That’s why you can count on us to provide:
- 24/7 emergency service
- 100% satisfaction guarantee
- Free estimates on replacement quotes and service calls
- Highly trained and courteous technicians
Ready to work with our team of friendly experts? Reach out to us today to schedule HVAC or plumbing services in Louisville, KY.
Louisville HVAC & Plumbing FAQs
What indoor humidity level should I target during Ohio Valley summers?
Aim for 40 to 50 percent relative humidity for comfort and to help your AC work efficiently. If your home stays sticky even when the temperature is right, ask about airflow checks and whole-home dehumidification.
How can I prep for a same-day HVAC visit in Louisville?
Clear a path to the thermostat, air handler, electrical panel, and outdoor unit, replace a very dirty filter, and note noises, odors, or rooms that struggle. Easy access helps the technician diagnose quickly.
Do older Highlands or St. Matthews homes benefit from zoning?
Yes. Zoning uses dampers and separate thermostats so each level gets the airflow it needs. It helps upstairs bedrooms cool at night without over-cooling the main level.
Which SEER2 range makes sense for Louisville’s cooling season?
Mid to high SEER2 systems often deliver strong value when paired with correct sizing, sealed ducts, and a smart thermostat. Whole-home performance matters more than the rating alone.
What should I check before calling for AC repair on a hot afternoon?
Verify Cool mode with Auto fan, set the thermostat a few degrees below room temperature, make sure supply and return vents are open, and replace a clogged filter. If breakers trip or the outdoor fan hums without spinning, shut the system down and schedule service.
Will duct cleaning help with seasonal allergies in Louisville?
It can when paired with proper filtration and humidity control. A visual inspection, static-pressure test, and filter review will confirm if cleaning delivers a measurable benefit.
How do I keep the outdoor unit quiet for me and my neighbors?
Set the condenser on a level pad with clear side and top airflow, trim vegetation, and use vibration pads. Avoid locating the discharge near bedroom windows.
What is considered an HVAC emergency for Louisville homes?
No cooling or no heat during extreme weather, repeated breaker trips, smoke or burning smells, or water near equipment are urgent. Power the system off and request immediate service.
Can a heat pump work well in Louisville or should I stay with a furnace and AC?
Modern heat pumps cool efficiently and provide economical heat in spring and fall. Many homeowners choose a dual-fuel setup that uses the heat pump most of the year and the furnace during deeper cold.
What helps even out temperatures in long shotgun or two-story floor plans?
Check for open returns, correct blower speed, and balanced supplies. Adding return air to closed rooms, sealing leaky ducts, and considering zoning often solves hot-room complaints.
Recent Jobs and Reviews in Louisville, KY
Job Locations and Reviews
Completed full residential HVAC system installation featuring a 3-ton, 15.5 SEER air conditioning unit paired with an 80% AFUE downflow furnace. All work performed under residential HVAC permit RES-HVAC-26-03013, with system commissioned and verified operational at 76.22°F ambient temperature reading upon completion.
Responded to no-heat callback on recently installed heat pump system blowing cold air with auxiliary heat also producing cold air. Performed diagnostic testing using Fieldpiece meters to verify system operation and troubleshoot heating malfunction. Identified issue preventing proper heat output from both primary heat pump and backup auxiliary heating elements, corrected the problem, and restored system to proper heating operation with thermostat achieving setpoint temperature.
Completed USA Bronze Tanked Maintenance service including comprehensive water heater flush procedure. Drained sediment buildup from tank bottom, inspected temperature and pressure relief valve operation, verified proper thermostat settings, and checked all supply line connections for leaks. Documented equipment condition with photos showing water heater location in utility closet and surrounding plumbing fixtures. Unit is operating within normal parameters with no issues identified.
Conducted comprehensive HVAC replacement estimate for aging system showing significant deterioration, including discolored and peeling cabinet surfaces, worn components, and visible accumulation of debris. Evaluated both indoor air handler unit located in basement utility area on wooden platform and outdoor condenser unit positioned on concrete pad, documenting existing equipment condition, ductwork connections, electrical service, refrigerant line routing, and condensate drainage configuration to provide homeowner with complete system replacement options.
Responded to ignition failure on water heater less than one year old. Upon inspection, identified improper installation of gas line, plumbing connections, and condensate line requiring complete system reconfiguration. Performed initial diagnostic assessment and manometer reading test to verify gas pressure and system functionality. Scheduled return visit to completely redo all plumbing connections, gas line installation, and condensate drainage system to meet code requirements and manufacturer specifications. System restored to operational status with proper ignition function confirmed. Customer payment collected in full with zero balance remaining.
# HVAC Maintenance Service Completed Performed comprehensive annual maintenance on a 4-year-old single-system HVAC installation including Lennox furnace and outdoor condensing unit. Conducted thorough inspection of indoor air handler, verified proper operation of all mechanical components, and replaced 16x25x5 air filter. Inspected outdoor condenser unit, cleaned coils, checked refrigerant lines and electrical connections, and confirmed proper system operation. All equipment functioning within manufacturer specifications. This second annual visit completed; system ready for continued service and customer eligible for maintenance agreement renewal.
Responded to callback for recently installed system reporting no cooling, burning smell at thermostat, and smoke alarm activation. Upon arrival, inspected Honeywell Home programmable thermostat and wiring connections for signs of electrical failure or short circuit. Identified and corrected wiring issue causing overheating condition at thermostat terminal block. Verified all connections were properly seated and torqued to manufacturer specifications. System tested successfully with cooling mode operating normally, displaying 78°F ambient temperature at time of departure with no abnormal odors or smoke detected.
Completed comprehensive air conditioning tune-up and preventive maintenance on 5-year-old residential cooling system as part of annual maintenance plan. Performed thorough inspection of outdoor condenser unit, verified proper amperage draw at 17.24 amps using clamp meter, checked electrical connections, and assessed overall system operation. Unit found in good working condition with no deficiencies noted; all components operating within manufacturer specifications.
Conducted comprehensive HVAC replacement estimate for a 21-year-old non-operational system. Assessed existing equipment located in basement utility area, evaluated current ductwork configuration and thermostat setup, and documented system conditions through photographic documentation. Provided homeowner with replacement options and recommendations based on equipment age and system failure.
Completed routine USA Bronze Tanked Maintenance inspection of residential plumbing system in basement utility area. Documented existing moisture infiltration issues along concrete foundation walls and floor, noting water staining patterns and surface deterioration. Inspected copper supply lines with shut-off valves, PVC drainage piping, and associated connections for proper operation and structural integrity, with all components functioning within normal parameters at time of visit.
Responded to a clogged toilet in a residential bathroom. Successfully cleared the blockage using professional plumbing equipment, restoring full drainage and proper flushing function. Verified the toilet was operating correctly and confirmed additional facilities were available in the home during service.
Completed complimentary HVAC system maintenance as requested via scheduled appointment. System was reported as currently operating properly upon arrival. Performed comprehensive tune-up service including electrical diagnostics using clamp meter to verify amperage readings on system components. Measured and documented electrical current draw, recording readings of 86.0 and 34.98 amps at various points in the system to ensure proper operation within manufacturer specifications. Inspected all electrical connections, wiring bundles, and terminal points for secure connections and proper condition. Examined refrigerant lines with foam insulation for integrity and proper installation. Verified condenser coil fins and heat exchanger components for cleanliness and proper airflow. System tested and confirmed to be functioning within normal operating parameters with no issues identified requiring immediate attention.
Completed full HVAC system installation including new Lennox outdoor condensing unit and associated ductwork. Unit was properly positioned on rubber isolation pad over gravel base for drainage and vibration dampening. Connected refrigerant lines with insulated piping, secured all connections to exterior wall with appropriate mounting brackets, and installed electrical disconnects and control boxes per manufacturer specifications. Verified system operation with temperature readings confirming proper heat output at 714°F at the heating elements. All components tested and functioning within normal parameters.
Completed planned HVAC maintenance tune-up on residential cooling system as part of member servicing program. Performed standard preventive maintenance procedures including system inspection, temperature verification at thermostat showing 74°F cooling setpoint with 71.5°F ambient reading at outdoor unit, and documented equipment operation with Honeywell Home ProSeries thermostat functioning properly in automatic fan mode. System operating within normal parameters upon completion.
Completed multi-day installation of dual Rinnai 119-gallon gas water heaters with on-demand heating capabilities in commercial mechanical room. Removed existing leaking 120-gallon storage tank and installed new TJV120M replacement unit. Reconnected previously warranty-replaced Rinnai unit to new storage tank system. Installed all necessary copper piping, PVC connections, gas lines, pressure relief valves, and circulation components to integrate both water heaters into existing plumbing infrastructure. Repaired visible leaks throughout water heater plumbing system including connections, joints, and supply lines. Configured dual-unit system with proper venting, combustion air supply, and safety controls. Tested all connections for leaks, verified proper gas pressure, confirmed operational functionality of on-demand heating systems, and ensured compliance with manufacturer specifications and local plumbing codes.
Responded to service call for HVAC system failing to cool effectively, with thermostat set to 70 degrees while indoor temperature reached 80 degrees. Upon arrival, conducted diagnostic evaluation of split system consisting of Amana furnace with air handler and outdoor condensing unit. Customer reported compressor producing humming sound with condenser fan failing to operate. Performed comprehensive system inspection revealing outdoor condensing unit exhibiting advanced corrosion and deterioration on exterior casing, indicating significant age and exposure damage. Diagnosed failed condenser fan motor preventing proper heat rejection and airflow across condenser coil. Compressor attempting to operate but unable to function efficiently without proper ventilation and cooling from fan operation. Verified electrical connections at disconnect box and confirmed no tripped breakers or power supply issues. Given the extensive rust damage to outdoor unit cabinet, age of existing Amana equipment
Responded to service call for Trane air conditioning system failing to cool adequately, with indoor temperature at 80°F despite thermostat set to 70°F. Customer reported compressor making humming sound with condenser fan not operating. Upon arrival, performed diagnostic evaluation of outdoor condensing unit. Confirmed compressor attempting to start but condenser fan motor not engaging. Verified electrical supply at disconnect, confirmed no tripped breakers, and tested capacitor under load. Found dual run capacitor failed, preventing fan motor from starting while causing compressor to labor. Replaced defective capacitor with appropriate microfarad-rated component. Verified proper fan motor operation and confirmed compressor running normally without excessive amp draw. System cycled properly with adequate airflow through condenser coil. Monitored unit through complete cooling cycle to ensure proper operation and temperature differential.
Completed planned maintenance service on dual HVAC system as part of Platinum Level agreement. Provided 30-minute courtesy call prior to arrival as requested. Performed comprehensive inspection and maintenance on both 5-year-old units during second scheduled visit. Replaced 20x25x5 air filters on both systems to ensure optimal airflow and indoor air quality. Inspected indoor air handling units and verified proper drainage function at floor drain. Conducted thorough electrical testing on outdoor condensing units using digital multimeter to verify proper voltage, amperage, and system performance. Checked all electrical connections and wiring terminals for secure contact and proper operation. Inspected outdoor unit components including compressor, condenser coils, and associated electrical controls. Verified proper refrigerant pressures and system operation. All systems operating within manufacturer specifications with no issues identified.
Conducted comprehensive HVAC system replacement estimate at multi-unit residential property. Performed detailed assessment of existing equipment configuration, measured current insulation levels showing approximately 23-24 inches of fiberglass insulation at furnace location, and documented equipment accessibility in covered carport area. Evaluated system specifications and site conditions to provide homeowner with complete replacement options and recommendations for new HVAC installation.
Completed first platinum-level maintenance visit since installation on single HVAC system. Performed comprehensive inspection of gas furnace unit, verified proper operation of all components including blower assembly, heat exchanger, and burner system. Checked gas line connections, electrical wiring, and PVC venting for proper installation and function. Replaced 16x25x4 air filter as part of routine maintenance protocol.
