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 no cooling complaint on 3-year-old residential HVAC system. Performed diagnostic evaluation of outdoor condensing unit and measured electrical parameters using clamp meter. System found not operating at proper cooling capacity. Conducted comprehensive assessment of refrigerant circuit, compressor amperage draw reading 55 amps, and overall system performance to identify root cause of cooling deficiency.
Performed diagnostic inspection on mini-split indoor unit located in basement closet. Opened front panel and accessed evaporator coil assembly to assess cleaning requirements. Identified need for AprilAire 35 humidifier pad replacement on associated system. Documented internal components including horizontal fin arrangement and air distribution louvers. Part has been ordered for follow-up installation, estimated completion time of 60 minutes upon arrival. System currently operational (green priority status). Captured photographic documentation of unit interior and coil condition for service records.
Completed professional installation and inspection of wall-mounted tankless water heater system in residential utility space. Installation includes properly configured white PVC venting with S-shaped exhaust loops extending to ceiling, color-coded PEX supply lines (red for hot water, blue for cold water), copper piping connections, yellow flexible gas supply line, and blue ball valve shut-off controls. Unit displays ENERGY STAR certification and features digital control panel for temperature management. All plumbing connections secured to wall per manufacturer specifications, with proper valve placement for system maintenance and emergency shut-off capability. Venting configuration meets code requirements for gas-fired tankless operation, ensuring safe exhaust of combustion gases. System tested and verified operational.
Responded to no cooling complaint on 15-year-old residential air conditioning system. Upon inspection, diagnosed failed dual-run capacitor preventing compressor and condenser fan operation. Replaced defective capacitor with new unit, restoring full system functionality. Verified proper operation at thermostat showing 76°F display, confirmed cooling cycle initiation, and tested both compressor and outdoor fan motor performance. System returned to normal cooling operation.
Performed comprehensive electrical inspection of residential property including basement and main living areas. Verified proper installation and functionality of smoke detector mounted to ceiling joists in unfinished basement area. Inspected electrical wiring routed along exposed joists, confirming secure cable management and compliance with code requirements. Checked HVAC system electrical connections and verified proper grounding of mechanical equipment. Examined structural support posts and ensured no electrical hazards were present near metal columns. Inspected main floor electrical components including wall-mounted switches, doorbell system, and low-voltage devices. Verified proper operation of dual-switch light switch plate and confirmed secure mounting of all wall-mounted electrical fixtures. All systems tested and found to be functioning properly with no safety concerns identified.
# HVAC Service Completed Responded to no cooling complaint on residential split system over 10 years old. Upon arrival, performed diagnostic evaluation of outdoor condensing unit and indoor air handler system. Completed repairs per approved estimate to restore cooling operation. Serviced dual outdoor condenser units located on exterior concrete pads. Addressed cooling system failure through systematic troubleshooting of refrigeration circuit, electrical components, and mechanical systems. Inspected Carrier furnace and associated air handler equipment in basement utility area. Verified proper operation of all HVAC controls and safety devices. Completed necessary repairs to condensing unit including component replacement as specified in estimate. Tested system performance following repairs. Confirmed adequate airflow through evaporator coil and proper refrigerant pressures. Verified electrical connections secure at both outdoor and indoor equipment. System restored to normal cooling o
Completed installation of Generac backup generator unit on prepared concrete pad against residential exterior wall. Installed electrical connections, gas line via PVC conduit, and verified proper positioning and operational readiness of the system for emergency power service.
Completed Platinum Level planned maintenance on single HVAC system. Performed comprehensive system inspection including control board examination, wiring connections, and thermostat calibration check to address customer concern regarding temperature reading discrepancy. Inspected electrical components, circuit boards with wireless communication module, capacitor, and heat sink assembly. Verified all wire connections at terminal blocks and assessed system controls. Noted dust accumulation on interior components and insulation material. All electronic components and circuit boards found in good working condition with no visible damage or corrosion detected.
Responded to service call for detached ductwork in residential HVAC system. Upon inspection, found flexible duct sections had become disconnected, likely due to animal activity in the crawlspace or attic area. Documented interior condition of ductwork showing accumulated debris and deterioration consistent with compromised connections. Assessed air handler unit and surrounding duct connections, noting the 2-year-old system was otherwise functioning properly with no heating or cooling performance issues. Photographed damaged sections and discussed repair options with homeowner prior to proceeding with any corrective work per customer request.
Responded to no-cooling complaint for upstairs HVAC system in dual-zone residence with 7-year-old equipment. Performed diagnostic evaluation and temperature differential testing at supply registers, measuring 53.8°F discharge air temperature. Pulled new thermostat wire to restore proper communication between control system and air handler. Verified airflow at vents and confirmed downstairs system operating normally while upstairs zone experienced elevated temperatures reaching 80°F. System restored to proper operation with adequate cooling capacity confirmed at supply registers.
# HVAC Install - Complete System Completed full system installation of residential HVAC equipment including furnace and associated ductwork in basement utility area. Performed comprehensive system verification and temperature diagnostics, confirming supply air temperature of 50.3°F at the air handler. Installation includes properly secured black flexible ductwork connections, integrated air filter housing with return air system, and all necessary piping connections. System tested and operational with all components functioning within manufacturer specifications.
Responded to no heat/no cool call on two-year-old HVAC system with thermostat displaying run status but no unit operation. Diagnosed faulty pressure switch preventing system startup on both heating and cooling modes. Replaced defective pressure switch, restored full system operation, and verified proper heating and cooling functionality.
Conducted comprehensive HVAC system replacement estimate for residential property with currently operational equipment. Performed detailed measurements of existing ductwork and evaluated current furnace installation, including assessment of PVC condensate drainage, filtration system, and flexible duct connections in utility area. Documented equipment specifications, spatial constraints, and mechanical room conditions to provide accurate replacement system recommendations and ensure proper sizing for new high-efficiency equipment installation.
Completed follow-up visit to install return air grille in hallway ceiling and install breaker panel blanks in electrical panel to fill unused breaker slots. All work performed per code requirements and system is operating properly.
Conducted comprehensive replacement estimate for residential HVAC system. Existing Rheem outdoor condensing unit failed and no longer providing cooling, forcing occupants to rely on temporary window air conditioning units. Assessed current equipment installation, natural gas meter configuration, and site conditions to develop complete system replacement specifications for new heating and cooling equipment.
Responded to no-heat call on 30-year-old furnace unit. Upon arrival, accessed control compartment and performed visual inspection of internal components, wiring connections, and control board assembly. Documented existing conditions of electrical connections, wire routing, and control module configuration with photographs for service records. Advised property owner that diagnostic findings unrelated to previous service work would be subject to standard service charges per callback policy.
Responded to callback for leak under bathroom sink following recent service visit. Upon inspection, discovered failed corroded pipe fitting causing water seepage beneath vanity. Removed deteriorated metal valve component showing significant oxidation and verdigris buildup. Replaced defective fitting with new assembly, installed fresh washer, and tested faucet operation under full water flow. Verified no leaks present at connections and confirmed proper drainage. Issue resolved and system returned to normal operation.
Relocated outdoor air conditioning condenser unit to new position adjacent to brick wall. Disconnected refrigerant lines, electrical connections, and condensate drain from original location. Moved unit and reinstalled on existing concrete pad. Reconnected all electrical conduit, PVC piping, and refrigerant lines to unit. Verified proper placement, secured all utility connections, and ensured unit was level and stable on pad. System repositioned successfully with all connections intact and operational.
Responded to service callback for HVAC system failure following previous low voltage wire repair. Upon arrival, system remained non-operational despite prior technician's work. Performed comprehensive diagnostic assessment of unit including visual inspection of heat exchanger coils, refrigerant lines, and electrical components. Connected Fieldpiece SMAN manifold gauges to measure system pressures and temperatures, recording readings of 446 PSI low side and 1396 PSI high side with superheat at 546°F. Inspected copper refrigerant lines with foam insulation showing wear and discoloration. Examined condenser coil fins which displayed dust accumulation and typical outdoor equipment wear. Documented all findings with detailed photographs of internal components, pressure readings, and system conditions for accurate service records and potential warranty claims. System issue persists and requires further troubleshooting to identify root cause beyond initial low voltage wiring concern.
Completed follow-up visit to finalize HVAC installation in residential basement mechanical room. Verified proper installation and connection of Amana furnace unit with associated flexible ductwork system extending to ceiling and wall distribution points. Confirmed galvanized sheet metal ductwork network properly secured and connected to air handler unit with appropriate sealing at all joints and transitions. Documented completed installation showing furnace, air handler, water heater, and full ductwork system operational and ready for service.
