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
Conducted on-site assessment for complete air conditioning system replacement in residential property. Evaluated existing HVAC infrastructure including furnace unit located in utility closet with connected ductwork and return air vent system. Documented equipment specifications, measured return air grille dimensions, and photographed current installation configuration to provide accurate replacement estimate for new AC unit as requested.
Conducted comprehensive HVAC replacement estimate for 25-year-old heating and cooling system currently in operational condition. Assessed existing gas furnace with exposed internal components including blower motor, gas valves, and burner assembly, along with associated ductwork and electrical panel configuration. Documented equipment condition, reviewed system specifications, and provided recommendations for complete system replacement to improve efficiency and reliability.
Conducted indoor air quality system assessment in basement area with no existing IAQ equipment. Evaluated aged residential structure with exposed floor joists, existing HVAC ductwork, and deteriorated conditions including moisture damage, poor ventilation pathways, and accumulated debris. Documented current air distribution infrastructure and structural conditions to develop comprehensive IAQ system installation recommendations.
Installed a new 50-gallon AO Smith ProLine Commercial Grade gas water heater in the mechanical room. Connected all water supply lines with flexible connectors and brass fittings, installed proper gas line connections, and verified all safety controls and venting systems are functioning correctly per manufacturer specifications.
Conducted comprehensive replacement estimate for existing HVAC system in basement mechanical room. Evaluated current Arcoaire furnace unit and white air handler installation, assessed ductwork configuration including rigid supply ducts extending from furnace to ceiling joists, and documented existing equipment specifications. Photographed equipment layout, utility room conditions, electrical connections, gas line routing, and spatial constraints for replacement planning, providing homeowner with complete system replacement options and recommendations.
Completed follow-up visit to address previously deferred maintenance items. Installed replacement belts on HVAC equipment as discussed with on-site contact. Conducted comprehensive equipment inventory survey of all units on property to prepare maintenance package proposal, documenting make, model, and specifications of multiple systems. Inspected electrical contactors and control wiring in unit control panels, photographed components for service records showing proper connections and system configuration.
Conducted comprehensive HVAC replacement estimate for aging Sears residential system with failing compressor operating on R-22 refrigerant. Evaluated existing thermostat control system and electrical infrastructure, including breaker panel configuration with dedicated AC circuit and solar photovoltaic integration. Documented current equipment condition and provided replacement recommendations for complete system upgrade to modern, energy-efficient equipment compatible with approved refrigerants.
Completed installation of circuit breakers in electrical panel as continuation of previous electrical work. Installed multiple 20-amp Square D circuit breakers in panel mounted in tiled wall opening, coordinating work timeline with HVAC installation crew on site to ensure proper sequencing of trades.
Responded to no cooling complaint on 9-year-old rooftop AC system. Diagnosed failed control board on initial visit, returned with replacement board and installed. Second callback required for failed condenser fan motor. Replaced Marathon condenser fan motor, verified proper electrical connections, and restored system to full cooling operation. Unit tested and operational upon completion.
Completed Platinum Level annual maintenance on a 6-month-old Lennox HVAC system. Performed comprehensive system inspection including evaluation of air handler components, control boards, and electrical connections. Replaced 16x26x5 PureAir filter and verified proper operation of dual circuit boards with inductive coils and capacitors. Conducted temperature and performance diagnostics using calibrated testing equipment, recording operational readings within manufacturer specifications. All system components functioning properly with no deficiencies noted at time of service.
Conducted comprehensive assessment of existing HVAC system in residential duplex property for full replacement estimate. Both heating and air conditioning units identified as original equipment dating from mid-1980s to early 1990s, approximately 33 years old. Inspected York furnace installation in basement mechanical room, evaluated condition of existing flexible ductwork with metallic insulation, and documented current system configuration including air handler, plenum connections, and refrigerant line routing. Photographed equipment nameplate information, ductwork layout, and overall installation setup to provide accurate replacement specifications and equipment sizing recommendations for aged heating and cooling system.
Responded to no cooling call on 6-year-old Goodman AMVC961005CNBA system where outdoor unit was not energizing and indoor temperature had risen to 77 degrees. Diagnosed failed control board and completed scheduled installation of replacement board, restoring normal system operation and cooling capacity.
Successfully completed kitchen sink plumbing installation including repiping the drain line from the sink to the garbage disposal unit with new white PVC trap assembly and connections. Additionally performed drain line snaking service to clear the kitchen sink drain and restore proper water flow.
Responded to a no-cooling complaint for multiple HVAC units at a commercial property with systems approximately 10-15 years old. Performed diagnostic evaluation on two to three units servicing office and main building areas that were not maintaining adequate temperature. Conducted comprehensive system assessment including electrical component inspection and refrigerant system analysis. Utilized digital manifold gauges to measure system pressures and temperatures across multiple points, recording superheat and subcooling values to determine system performance. Inspected electrical panel components including capacitor, contactor, and associated wiring for proper operation and connections. All units showed airflow at vents with no ice buildup present at time of service. Documented system conditions with detailed photographs of electrical components and diagnostic readings for service records.
Responded to no cooling condition on 6-year-old residential HVAC system that had ceased operation within the previous 24 hours. Diagnosed failed dual-run capacitor preventing compressor and condenser fan operation, resulting in room temperature air from supply vents. Replaced defective capacitor with ProSelect 440/370VAC rated unit, restored system to normal cooling operation, and verified proper amperage draw on all components.
Conducted comprehensive on-site assessment of existing residential boiler system for replacement estimate. Evaluated aged boiler unit with associated piping, control valves, circulator pump, and electrical components. Documented current system configuration including red-handled control valve assembly with threaded brass connections, vintage boiler with multiple supply and return lines, basement mechanical room layout, and existing ductwork infrastructure. Photographed equipment conditions showing signs of age and wear on control mechanisms and boiler surfaces. Assessed mechanical room accessibility, structural considerations, and existing utility connections to provide accurate replacement specifications and recommendations.
Conducted comprehensive HVAC replacement estimate for non-operational system. Documented existing equipment including 100-amp electrical panel with circuit breakers and air handler unit located in attic space. Observed significant mold contamination throughout ductwork and air handler components, with thick microbial growth covering metal surfaces and requiring remediation prior to new equipment installation. Measured existing ductwork dimensions and assessed electrical infrastructure to determine compatibility requirements for replacement system.
Responded to cooling system complaint on 9-year-old air conditioning unit. Upon inspection, identified refrigerant leak at condenser unit. Evaluated system components including AirEase furnace and associated ductwork in basement mechanical area. Documented equipment condition and leak location through photographic evidence. Provided customer with comprehensive estimate for complete HVAC system replacement due to age of equipment and extent of refrigerant leak, which made repair economically unfeasible compared to new installation.
# HVAC Service Completion Summary Responded to service call for 9-year-old AC system with reported cooling failure and condenser leak. Upon inspection, discovered severely corroded copper refrigerant tubing at evaporator coil connections with active leak points. Extensive rust and corrosion present on tubing bends and mounting plate, indicating prolonged moisture exposure. Documented condition of outdoor condensing unit and compromised indoor coil assembly. System requires refrigerant line replacement and evaporator coil evaluation due to extent of corrosion damage affecting system integrity and cooling performance.
Responded to no cooling call on 23-year-old residential HVAC system with reported intermittent operation that had ceased functioning. Upon arrival, confirmed no airflow from supply vents and no breaker trips. Performed diagnostic inspection of system components including air handler and condensate drainage assembly. Visual inspection revealed heavily soiled return air filters with significant dust and debris accumulation restricting airflow, as well as evidence of moisture staining and mineral deposits around condensate drain fittings indicating potential drainage issues. Documented system condition through photographic evidence showing clogged filtration and corroded drain components. Advised property owner of findings related to compromised airflow and drainage concerns affecting system performance on aged equipment.
