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 annual Platinum Level maintenance on 1 HVAC system. Replaced 16x25x1 air filters and performed comprehensive system diagnostics including temperature differential measurements at supply registers. Customer's system is operating within specifications and is properly maintained for optimal performance until the next scheduled service.
Diagnosed and serviced HVAC system with continuous fan operation issue that required breaker shutdown to prevent excessive energy consumption. Inspection revealed significant dust accumulation in the electrical control panel with multiple connection points showing signs of aging. Cleaned electrical components, verified proper wire connections, and restored normal cycling operation of the system.
Performed monthly platinum-level maintenance service on HVAC system, including replacement of 16x25x4 filter. Inspected electrical components and connections for proper operation, finding all contactors, relays and wiring in good condition. Conducted electrical performance testing using clamp meter, recording 54.6 amp measurement which falls within manufacturer specifications. System is operating normally with no issues detected.
Conducted comprehensive assessment of existing HVAC system for potential replacement. Inspection revealed significant weathering and corrosion on exterior electrical panel with visible rust and deterioration of metal housing. Outdoor AC condenser unit examination showed aging equipment mounted on concrete pad requiring upgrade to improve energy efficiency and system reliability.
Completed scheduled Gold Level annual maintenance service on one HVAC system (second visit of the year). Replaced ACE air filter with customer-provided replacement and inspected burner assembly, confirming proper flame pattern and combustion. System control board was examined and all components are functioning normally; system is operating within manufacturer specifications.
Replaced a perforated pipe segment in a 200-year-old home where water damage was evident in ceiling joists and wall surfaces. Accessed the deteriorated section through an existing cavity, installing new PVC piping to replace the damaged metal pipe. Verified system integrity after completion with no leaks observed.
Completed platinum-level maintenance service on a 1-year-old HVAC system, which included inspection of the furnace internal components and examination of associated drainage plumbing. Replaced air filter and performed first annual visit maintenance procedures according to manufacturer specifications, documenting system condition with detailed photographs for service records.
Conducted follow-up site visit to evaluate bathroom register relocation requirements following customer remodel. Inspected existing HVAC ductwork in unfinished basement area, noting cylindrical ducts with reflective metallic insulation and elbow joint connections. Documented current installation with photographs for proper planning of register repositioning work.
Conducted replacement estimate for 20-year-old non-functioning HVAC system. Inspection revealed aging indoor furnace unit with attached documentation in utility area, alongside fire safety equipment. Exterior assessment showed weathered condenser unit with visible deterioration, installed against brick wall with significant algae growth and poor surrounding maintenance.
Completed annual platinum maintenance service on 1-year-old system. Replaced KOCH air filter and inspected Honeywell ProSeries thermostat, confirming proper operation with temperature at 78°F and 24% humidity. System is functioning within specifications following comprehensive maintenance protocol.
Successfully installed replacement TXV valve on outdoor unit during scheduled appointment. Verified proper refrigerant flow and system operation after installation with no leaks observed. System is now functioning at optimal performance with all components properly secured and tested.
Diagnosed and repaired two malfunctioning light switches in a 25-year-old condominium. Completed comprehensive inspection and replacement of defective switches, restoring proper functionality to the lighting system.
Identified unsealed joints and unsecured bracket in indoor utility closet HVAC system, causing air leakage at multiple connection points. Applied metallic tape to seal exposed seams on galvanized ductwork and properly secured mounting hardware on the main housing panel to restore system integrity and prevent further air loss.
Completed Platinum Level maintenance service on HVAC system located in attic space. Inspected unit condition, connections, and ductwork integrity, noting proper installation of insulated flexible ducts and PVC drain line. Used leveling tools to verify proper equipment positioning and performed all required maintenance tasks per Platinum service protocol.
Completed adjustment of evaporator coil positioning as specified in previous inspection. Verified proper level and alignment using spirit level during installation. Ensured proper connection of PVC condensate lines and electrical wiring to the air handler unit in attic space.
Performed complete Gold DUO maintenance service on two residential HVAC systems (2 years old) including inspection and cleaning of both indoor and outdoor units. Replaced 20x25x5 air filters in both systems and verified proper system operation. Customer opted to renew annual maintenance agreement for continued coverage.
Completed monthly platinum level maintenance on one HVAC system per CFI requirements. Inspected interior electrical components including capacitor, wiring connections, and circuit boards. Observed normal dust accumulation in unit housing and verified all colored wires (red, yellow, purple, black, green, white) were properly secured to their respective terminals with no signs of damage or overheating.
Performed site visit to inspect recertification pump system. Documented existing water heater installation showing signs of wear including damaged pipe insulation and corrosion on copper pipes and fittings. Noted significant oxidation on plumbing components, particularly at joints, with visible rust streaks on galvanized metal ductwork requiring attention during recertification process.
Completed annual Platinum maintenance service on a 2-year-old HVAC system with 20x25x5 filter (1st visit). Performed comprehensive inspection of electrical components, checked control board functionality, and conducted temperature differential testing using diagnostic equipment. System is operating within manufacturer specifications with no issues identified.
Completed annual Platinum Level maintenance on 5-month-old HVAC system. Inspected and replaced air filter, ensuring proper airflow through the system. Documented service with photos of vent registers and system components, confirming all maintenance tasks were performed according to scheduled first visit protocols.
