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 diagnostic assessment on 20-year-old HVAC system experiencing no heat and no airflow issues. Inspection of blower assembly and internal components revealed significant dust accumulation and light corrosion on fan housing. System restored to proper operation after cleaning blower wheel, checking electrical connections, and performing complete system reset.
Completed monthly maintenance service on HVAC system per Platinum Level agreement. Inspected and verified proper operation of two programmable thermostats, confirming accurate temperature readings and system response. Replaced 20x20x5 air filter as scheduled in the maintenance plan.
Completed annual platinum level maintenance on HVAC system. Inspected control board, ductwork, and drainage components. System is approximately one year old and does not require renewal at this time. This was the first maintenance visit since installation.
Installed and activated a GREEN humidifier system to improve indoor air quality. Inspected existing plumbing infrastructure in basement area, which showed aging copper pipes with visible oxidation at connection points. Connected new humidifier to water supply and integrated with existing HVAC ducting system. Payment processed via customer's credit card.
Responded to service call for malfunctioning toilet. Upon inspection, confirmed broken toilet flange and deteriorated wax seal as reported. Successfully removed toilet, replaced damaged flange and installed new wax seal, then properly secured toilet to floor with mounting bolts and verified proper function with leak test.
Diagnosed furnace ignition failure issue that persisted after previous service call. Inspected electrical wiring connections and burner assembly, finding the system was now successfully igniting with proper flame pattern across all burners. Verified complete ignition sequence and normal operation after repair.
Conducted site assessment for potential humidifier installation on existing HVAC system. Evaluated current ductwork configuration and available mounting space near the air handler unit. Documented mechanical room conditions, noting the vertical PVC piping adjacent to the unit and the partially finished drywall that would require consideration during installation planning.
Completed diagnostic inspection of HVAC system and identified failed inducer motor assembly. Documented model/serial information and acquired necessary replacement parts (inducer motor and rubber 90° connector) through Goodman, with parts placed on will-call status under PO# 403358692-001. System currently non-operational with repair estimated to require 45 minutes once parts are installed.
Conducted comprehensive HVAC replacement evaluation for existing customer who previously had AC installation and now requires furnace replacement. Inspected current Nest thermostat wiring configuration and aging furnace unit with visible wear. Documented vertical flue pipe and overall system layout to prepare accurate replacement options.
Responded to a callback for temperature control issues. Inspected HVAC system and ductwork in the crawl space, focusing on the flexible metallic ducts with reflective insulation and associated PVC ventilation piping. Identified and resolved airflow restriction problems, ensuring proper system operation and temperature regulation.
Successfully installed new AprilAire Model 60 Humidifier Control panel to replace malfunctioning humidistat. System now operational with proper functionality confirmed - unit displaying 30% humidity with "Humidifier On" indicator illuminated. All electrical connections properly wired and system tested to ensure proper operation of customer's humidifier.
Completed Platinum Level maintenance on 1-year-old Lennox system with 16x25x4 filter. Inspected furnace components, verified proper venting connections, and performed pressure diagnostics (36.8 reading observed). System is functioning within normal parameters for first annual maintenance visit.
Completed monthly planned maintenance of HVAC system per Platinum Level service agreement. Inspected and verified proper operation of wall-mounted air vent/return register. Confirmed GE smart thermostat functioning correctly in heating mode with appropriate temperature differential between setting (68°) and ambient temperature (72°).
Conducted follow-up service visit to inspect previously installed plumbing connections and HVAC ductwork. Documented T-junction PVC pipe assembly in structural space and examined black insulated flexible ducts running through attic/crawl space. Visual inspection confirmed installation status and identified areas requiring attention.
Performed scheduled Platinum Level maintenance on 1 HVAC system (2-year service). Conducted electrical diagnostics using test probe on control board circuitry. Measured supply temperature reading of 139°F with digital thermometer. Replaced 16x25x4 air filter as part of first maintenance visit. System operating within normal parameters after service completion.
Completed annual platinum maintenance service on 1-year-old HVAC system. Performed electrical component inspection and testing with multimeter to verify proper voltage and connections at the control board, confirming all circuits and indicator lights functioning correctly. Checked and confirmed proper operation of the Honeywell Home ProSeries thermostat, which was maintaining temperature at 66°F with 70°F setpoint. Customer opted to renew maintenance agreement for continued system protection.
Conducted inspection of customer's water heater due to complaint of insufficient heating during cold weather. Visual examination of the Bradford White unit in basement utility area revealed no immediate external issues. Checked temperature settings and confirmed proper installation of supply lines. Recommended regular maintenance schedule to prevent sediment buildup despite recent flushing by previous service provider.
Responded to a no-heat service call for a 5-year-old Goodman system that was short cycling and failing to maintain set temperature (consistently 3-5 degrees below setpoint). Upon inspection, observed proper flame characteristics from burner tubes but detected irregularities in the temperature sensing system. Performed diagnostic testing with temperature probe on control board wiring, identified and corrected faulty temperature sensor connection that was causing system to misread ambient temperature and short cycle. Verified proper operation after repair with system now maintaining desired temperature.
Responded to no heat call for 10-month-old system with home temperature at 51°F. Diagnosed failure in control board as indicated by lack of airflow and non-functioning components. Temperature probe confirmed 96.5°F reading at heat exchanger. Replaced faulty control module and restored system operation. All functions tested and verified working properly before completion.
Diagnosed and identified failed condensate drain trap in HVAC system requiring replacement. Inspected PVC plumbing connections and documented model/serial information for proper part ordering. System remains operational with follow-up installation appointment scheduled to replace the drain trap component once part arrives.
