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
Responded to service call for complete central air conditioning system failure affecting entire residence. Assessed existing 1.5-ton (18,000 BTU) AC system of unknown age that had ceased operation. Inspected outdoor condenser unit, noting weathered housing with vegetation overgrowth around base and unit positioned on concrete pad against building exterior. Examined electrical disconnect box and verified circuit breaker panel configuration with dedicated AC circuit. Documented equipment condition through photography of both electrical panel and outdoor condenser unit. Provided consultation and prepared comprehensive replacement estimate for new HVAC system installation due to complete system failure and unknown equipment age.
Completed furnace replacement with new Lennox unit installed in utility closet. Verified system operation with temperature readings at 83.4°F and confirmed proper airflow through ductwork connections. Installation tested and operational upon completion.
Conducted comprehensive HVAC system evaluation for full replacement estimate at owner-occupied single-family residence. Assessed existing 20-year-old air conditioning system experiencing recurring failures and heating equipment of undetermined age. Documented current system configuration including Honeywell conventional thermostat with standard wiring (R, C, Y, W, G terminals), interior blower assembly, refrigerant line connections, and condensate drainage system. Photographed thermostat wiring schematic and internal mechanical components to determine proper equipment sizing and compatibility requirements for complete system replacement. Provided consultation on whole-house heating and cooling replacement options based on existing infrastructure and equipment condition.
Responded to no cooling call on 3-year-old residential HVAC system. Upon arrival, confirmed system was completely non-operational with no power to unit. Performed diagnostic inspection of air handler and control systems. Examined electrical connections, control board, and low-voltage wiring within the air handler compartment. Identified faulty wiring connections and loose terminals affecting system operation. Secured all electrical connections, tested control voltage, and verified proper power supply to components. Cycled system through startup sequence and confirmed unit returned to normal operation with proper airflow and cooling output.
Responded to emergency gas leak call for dual-system residential HVAC installation. Upon arrival, confirmed strong constant gas odor inside structure near furnace location. Gas utility company had previously shut off meter valve due to leak detection. Performed comprehensive leak detection inspection of gas supply lines, connections, and furnace manifold using electronic leak detector and soap bubble solution. Identified leak at yellow flexible gas connector (CSST) connection point at furnace inlet. Inspected black iron pipe gas supply line, red shutoff valve, and all threaded fittings for additional leak sources. Verified proper torque and thread sealant application on all gas line connections. Tightened loose flex connector fitting and re-tested connection points. Conducted complete system pressure test to verify leak repair integrity. Inspected furnace internal components including blower motor, electrical connections, and burner assembly for proper operation and safety compliance.
Completed A+ callback to address humidifier water line connection that was not hooked up during initial installation. Connected humidifier to water supply line and verified proper operation of unit. System is now functioning as designed with humidifier operational.
Installed a complete 2.5-ton Lennox air conditioning system including indoor evaporator coil integrated with existing furnace and outdoor condensing unit. The outdoor unit was positioned on a rubber isolation pad against the building's brick exterior with proper electrical disconnect and refrigerant line connections via PVC-concealed penetrations. All work was completed under permit RES-HVAC-26-03197 with proper refrigerant charging, system testing, and verification of airflow through existing ductwork infrastructure.
Installed customer-supplied double-handle chrome kitchen faucet with separate spray nozzle attachment on white double-basin sink. Additionally installed 1/2" ball valve on water supply line, connecting blue PVC pipe to flexible braided supply hoses to complete the plumbing installation.
Completed Platinum Level planned maintenance on a 10-month-old single-zone HVAC system during its second service visit. Performed comprehensive system diagnostics including electrical testing of the outdoor condenser unit with digital multimeter to verify proper amperage and voltage levels. Inspected all internal electrical components, wiring connections, and refrigerant line connections at the outdoor unit. Verified thermostat operation and temperature control functionality at 70 degrees. All system components operating within manufacturer specifications with no deficiencies noted.
Completed Platinum Level planned maintenance on a 6-year-old single HVAC system. Replaced 16x25x5 filter, performed comprehensive system diagnostics including electrical measurements of the outdoor condenser unit with readings of 490 and 36.66 amps recorded on condenser fan motor, verified proper operation of all components, and documented system performance with photos for service records.
Completed Platinum Level maintenance on residential HVAC system during scheduled service window. Customer was unavailable upon arrival and did not respond to contact attempts; service was rebooked per three-day scheduling board and successfully performed on return visit. Performed comprehensive maintenance protocol on single system including outdoor condenser unit and indoor components. Replaced 16x20x5 air filter as part of routine maintenance. System is approximately 3 years old and this represents the second scheduled maintenance visit. All equipment operating within normal parameters upon completion of service.
Responded to emergency service call for water leaks following new refrigerator installation. Upon arrival, main water supply was shut off due to active leaks at kitchen sink faucet and refrigerator ice maker supply line. Inspected under-sink plumbing connections and identified dripping from both the kitchen faucet water supply and the refrigerator ice maker line connection point. Tightened compression fittings on the ice maker supply line and kitchen faucet supply connections. Verified proper seating of ferrules and checked all braided stainless steel flex lines for damage or wear. Restored main water supply and pressurized system. Conducted thorough leak check of all connections including P-trap assembly, garbage disposal connections, and supply valves. Confirmed all fixtures operating properly with no active leaks. Educated customer on proper valve operation for future appliance installations. Water service fully restored to residence.
Performed routine maintenance flush on conventional tanked water heater as part of preventative maintenance campaign. Drained sediment buildup from tank bottom to improve heating efficiency and extend equipment lifespan. Inspected gas control valve, flexible gas connector, and safety labels for proper operation and compliance. Verified proper installation of drip pan and documented equipment condition through photographic records. Presented Bronze maintenance plan renewal option to customer for ongoing system protection.
Completed comprehensive HVAC load calculation analysis for system replacement using EDS virtual load calculator. Assessment determined cooling load of 30,438 BTU and heating load of 46,861 BTU, with required system capacity of 2.9 tons at 0.75 sensible heat ratio and airflow requirements of 1,162 CFM for cooling and 609 CFM for heating.
Provided complimentary second opinion on non-operational HVAC system that had been inactive for nearly a year after previous contractor diagnosed failed evaporator coil. Upon inspection, confirmed extensive corrosion and deterioration on coil assembly with visible oxidation patterns indicating prolonged heat exposure and moisture damage. System age estimated at over 10 years based on component condition. Examined thermostat wiring connections and verified proper terminal configuration. Documented severe mineral deposits and degradation on refrigerant line connections and mounting brackets. Confirmed previous diagnosis of failed coil and advised homeowner on system condition and replacement options given age and extent of component deterioration.
Completed monthly platinum-level preventive maintenance on residential HVAC system, including comprehensive inspection of furnace unit, PVC venting configuration, and electrical connections. Replaced 20x25x1 air filter as part of routine maintenance protocol to ensure optimal system performance and air quality.
Performed comprehensive system evaluation and second opinion diagnostic inspection of existing HVAC equipment. Conducted thorough visual assessment of air handler components, including filter housing, ductwork connections, and mounting assembly. Inspected condensate drainage system including PVC drain lines, fittings, and drip pan for proper operation and signs of moisture accumulation. Evaluated refrigerant line insulation and copper piping connections for condition and integrity. Documented equipment condition through photographic evidence showing installation configuration, drainage components, and accessible system elements. Provided homeowner with professional assessment findings to assist in making informed decision regarding repair versus replacement options.
# HVAC Maintenance Summary Completed planned maintenance on residential air conditioning system. Performed comprehensive system diagnostics using digital multimeter to verify electrical components and capacitor functionality. Inspected outdoor condenser unit, including fan operation, refrigerant lines, and electrical connections. All components operating within manufacturer specifications. System running efficiently with no issues identified. # Detailed Work Performed Arrived on site to perform scheduled maintenance on a one-year-old residential HVAC system requiring 16x25x5 filter media. This marked the second service visit for this equipment. **Outdoor Condenser Unit Inspection:** Conducted thorough visual inspection of the outdoor condensing unit positioned on concrete pad adjacent to building. Verified unit clearances and assessed surrounding area for proper drainage and airflow. Noted accumulation of leaves and debris in mulched area around unit base. **Electrical System Diag
Responded to no heat call on 2-year-old system with continuously running fan and no airflow through vents. Upon inspection, found severely restricted air filter causing complete blockage of airflow to the system. Replaced dirty filter with new unit, restoring proper airflow and system operation to normal heating function.
Completed scheduled AC tune-up and preventative maintenance on residential HVAC system. Verified thermostat operation and proper temperature control settings, confirmed system responding correctly in heating mode with auto fan operation. Inspected air handler unit and electrical connections, documented system condition with photos for service records.
