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 follow-up site visit to document and assess incomplete HVAC installation work. Performed visual inspection and photographed mechanical connections, pipe fittings, and conduit assemblies showing evidence of weathering, corrosion on brass fittings, and aging components requiring attention before project completion.
Performed preventative maintenance service on tank-style water heater as part of scheduled maintenance plan. Inspected all plumbing connections, shut-off valves, and flex connectors for proper operation and signs of wear. Observed significant condensation on tank exterior, indicating normal temperature differential between cold water supply and ambient conditions. Verified copper supply lines, brass fittings, and corrugated stainless steel flex line connections for leaks and proper installation. All components found to be functioning within normal parameters with no immediate repairs required.
Responded to no cooling complaint on 5-year-old residential HVAC system with adequate airflow but insufficient cooling capacity. Performed diagnostic evaluation using digital clamp meter to assess electrical parameters and system performance. Identified cooling deficiency and completed necessary troubleshooting procedures to determine root cause and restore proper system operation.
Completed comprehensive AC tune-up and maintenance service on residential air conditioning system. Performed system inspection, replaced 16x25x4 pleated air filter, and verified supply air temperature at 49.8°F, confirming proper cooling operation and system performance within normal parameters.
Performed comprehensive USA Bronze tanked water heater maintenance flush service. Drained sediment buildup from tank bottom through drain valve, inspected inlet/outlet connections with flexible stainless steel supply lines, verified proper operation of temperature and pressure relief valve, and confirmed all gate valves and shutoff mechanisms were functioning correctly. System was refilled, inspected for leaks, and returned to normal operation with all components operating within manufacturer specifications.
Responded to callback for cooling system malfunction following planned maintenance. Found interlock safety switch open, preventing system operation and causing indoor temperature to rise to 86°F with thermostat displaying error message. Inspected furnace safety controls, reset interlock switch, verified proper closure of access panels, and tested system operation. Confirmed cooling system restored to normal function with thermostat communicating properly and unit cycling correctly to reach setpoint of 72°F.
Responded to no cooling complaint with system blowing room temperature air. Upon inspection, discovered heavily clogged air filter restricting airflow to the system. Measured supply air temperature at 89.88°F, confirming lack of cooling output. Recommended filter replacement to restore proper airflow and system operation.
Responded to a call for a sink that would not stop running with a slow leak under the sink. Upon inspection, found that the shut-off valve beneath the sink was malfunctioning and failed to stop water flow when closed. Replaced the defective angle stop valve with a new brass and plastic compression valve assembly, restoring proper water shut-off functionality and eliminating the continuous leak.
Completed scheduled air conditioning tune-up and preventative maintenance service. Inspected HVAC system components including furnace unit, ductwork connections, and air handling equipment in mechanical room. Replaced 14x20x1 air filter with new KOCH brand filter to ensure proper airflow and system efficiency.
Completed roof vent modification by shortening PVC pipe penetration to proper height and verifying integrity of rubber boot flashing seal around pipe. Inspected asphalt shingle roofing surrounding penetration point to confirm weatherproof installation and documented completed work with photos.
Responded to water leak in yard of 70-year-old residential property where leak had been active for one to two weeks. Inspected under-sink plumbing connections including PVC P-trap assembly, tailpiece, and flexible braided stainless steel supply lines to identify potential source points. Documented existing plumbing configuration with white PVC drain components and shut-off valve connections for service record purposes.
Completed installation of HVAC ductwork in basement and attic spaces. Installed rigid metallic ductwork in finished basement area with proper support strapping and secured flexible aluminum ductwork in attic cavity with appropriate fastening and metallic tape at connection points. All ductwork properly positioned and secured to ensure optimal airflow and system performance.
Completed annual tanked water heater flush and inspection as part of Bronze preventive maintenance plan. Performed full system evaluation including visual inspection of water heater unit, supply and discharge piping, pressure relief valve, and shut-off valves. Flushed tank to remove sediment buildup, verified proper operation of all components, and documented existing plumbing infrastructure and under-sink cabinet conditions with photographic records for maintenance history.
Performed scheduled DV plumbing maintenance inspection and assessment of residential plumbing system. Inspected under-sink cabinet area, verifying P-trap configuration and water supply line connections for proper operation and potential leaks. Examined basement utility area ductwork and copper piping, documenting damaged insulation section on main duct requiring future attention. All accessible plumbing fixtures and connections were evaluated for wear and functionality. Coordinated arrival time per customer's scheduling requirements and provided photographic documentation of existing conditions for maintenance records.
Completed comprehensive replacement estimate for residential HVAC system following theft of original equipment. Assessed existing infrastructure in basement mechanical room including ductwork, refrigerant line routing, and electrical connections. Evaluated exterior condenser pad location and utility access points to provide homeowner with complete system replacement options and specifications.
Completed platinum level planned maintenance on single HVAC system including inspection of mechanical components, plumbing connections, and thermostat functionality. Replaced 20x20x1 air filter, verified proper operation of Honeywell Home ProSeries thermostat, and inspected PVC condensate drain trap and associated piping for proper drainage and secure connections. All system components operating within normal parameters with no issues identified.
Replaced 15 fluorescent 2x4 light fixtures in commercial kitchen area during after-hours service call per customer quote. All existing fixtures were removed and new units installed in drop ceiling grid, with proper electrical connections verified and tested for functionality upon completion.
Conducted on-site assessment for HVAC system relocation within basement area to accommodate remodeling and finishing project. Evaluated existing furnace, ductwork configuration, and mechanical equipment placement in current central basement location. Documented clearance measurements, ductwork routing, and structural considerations for relocating system to alternate basement area. Photographed existing installation including plenum connections, rectangular trunk lines, PVC condensate piping, and equipment positioning to develop comprehensive relocation estimate accounting for new duct runs, electrical modifications, and proper clearances in proposed location.
Completed full HVAC system installation including new air handler unit positioned in utility room corner with black flexible ductwork connections routed to ceiling plenum. Installation included complete duct runs with reflective insulation wrapping applied to exposed ductwork in conditioned living spaces to maximize thermal efficiency and minimize heat loss/gain. System commissioned and tested for proper airflow and operation upon completion.
Completed follow-up filter delivery as requested from previous service call. Delivered and installed four 20x20x2 pleated air filters to the HVAC system, with site access coordinated for after 3 pm availability.
