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 13-year-old residential HVAC system blowing warm air. Upon arrival, measured supply air temperature at 73°F, confirming lack of cooling with indoor temperature at 77°F. Performed diagnostic evaluation of system components including refrigerant levels, compressor operation, and airflow verification. System showed airflow present but inadequate cooling performance, consistent with reported symptoms that persisted after customer attempted system reset.
Responded to no-cool call on 2-year-old system with no airflow through vents and thermostat displaying "service urgent" error. Upon arrival, found indoor temperature rising from setpoint of 73°F to 76°F with complete loss of air circulation. Performed diagnostic evaluation of HVAC system including electrical components, air handler operation, and refrigerant circuit. Documented supply air temperature reading of 52.7°F and inspected mechanical room conditions, noting water damage on concrete floor near water heater that may require future attention but was unrelated to current HVAC issue. Identified system failure causing loss of cooling and airflow, completed necessary repairs to restore full system operation and verified proper function before departure.
Responded to no cooling call on 5-year-old Bryant system with interior temperature exceeding 80 degrees. Upon arrival, confirmed thermostat displayed 53 degrees with system set to cooling mode but producing warm air from supply vents. Performed diagnostic evaluation of HVAC system including furnace and air handler components, verified electrical connections, checked refrigerant levels, and inspected condensate drainage. Identified system malfunction preventing proper cooling operation and completed necessary repairs to restore full air conditioning functionality. System tested and verified operating within manufacturer specifications with proper airflow and temperature differential across evaporator coil.
Completed comprehensive HVAC replacement estimate for residential property with two existing systems requiring replacement. Performed thorough assessment of outdoor condensing unit showing age-related wear and weathering, evaluated electrical service connections, condensate drainage system with pump, and PVC ventilation piping. Documented equipment conditions and site specifications to provide homeowner with replacement options for both systems.
Completed follow-up maintenance visit to address incomplete cleaning from previous service call. Thoroughly cleaned outdoor condenser unit and evaporator coil assembly, which were heavily caked with accumulated dirt, dust, and debris due to inadequate prior maintenance. Removed excessive particulate buildup from filter media and coil surfaces to restore proper airflow and system efficiency.
Responded to service call for air conditioning system that had shut down due to water accumulation in drain pan. Customer had cleared condensate drain line prior to arrival and unit was operational upon inspection. Performed thorough system evaluation including inspection of indoor air handler, drain pan, condensate drainage system, and outdoor Carrier condenser unit. Verified proper system operation, confirmed drain pan was empty and draining correctly, and assessed refrigerant lines for excessive condensation which may indicate insulation issues or airflow concerns. System tested and found to be functioning within normal parameters following customer's drain line maintenance.
Conducted comprehensive HVAC replacement estimate for dual-system residential property. Evaluated aging outdoor condenser unit with significant wear and dirt accumulation, along with basement furnace installation requiring replacement. Documented existing equipment conditions, ductwork configurations, and installation parameters to provide homeowner with replacement options for both heating and cooling systems.
Replaced failed compressor on HVAC system with parts supplied by United Refrigeration. Documented electrical panel configuration and circuit directory showing dual A/C compressor circuits, heat pump, and air handler connections prior to component replacement. Completed compressor changeout and verified proper electrical connections and system operation.
Responded to no-cool condition on 1-year-old Lennox system displaying error code 413 (high pressure switch lockout). Installed previously ordered high pressure switch that was bypassed during prior service call, restoring proper safety controls. Verified system operation with all functions working properly, unit cooling normally with proper airflow and no abnormal pressures.
Responded to service call for mini split unit leaking water from indoor head unit onto exterior wall and roof area. Performed diagnostic assessment and attempted to clear condensate drain line from both interior and exterior access points; drain line found to be free of obstructions. Upon further inspection, determined indoor air handler is pitched incorrectly, tilting forward toward the drain connection, causing water to overflow from the unit rather than draining properly through the condensate line. Follow-up installation appointment scheduled for repositioning and leveling of the mini split head unit and correcting the condensate drain line configuration to resolve drainage issue.
Completed full system installation of a 3-ton Lennox 19 SEER2 fully modulating heat pump with matching air handler in basement utility area. Installed new air handler unit with proper ductwork connections, ensuring all manufacturer specifications were met for optimal system performance. System was tested and commissioned, achieving efficient operation with fully modulating capabilities for enhanced comfort and energy efficiency.
Responded to callback for 5-month-old AC system that was shut down due to flooded drip pan. Located unit in attic space and found condensate drain line completely blocked, preventing proper drainage. Cleared obstruction from drain line, verified proper flow through PVC condensate piping, and tested system operation to ensure pan was draining correctly and unit resumed normal cooling function.
Provided estimate for replacement of 25-year-old GE Zone Line unit with new 15K BTU heat pump system. Assessed existing installation location in residential living space and documented current unit configuration. Presented equipment options and specifications for packaged terminal heat pump replacement to restore efficient heating and cooling capacity.
Completed installation of mini split system. Performed system commissioning including refrigerant pressure verification, vacuum testing, and temperature differential measurements. System operating within manufacturer specifications with proper airflow and cooling performance confirmed.
Responded to no cooling complaint on one-year-old system blowing warm air with thermostat set to 68°F but reading 74°F. Performed diagnostic evaluation of HVAC system, confirmed adequate airflow through vents, verified no tripped breakers or evaporator coil freeze-up present. Documented system conditions and captured photos of installation area for service records.
Responded to callback for ongoing drain pan leak on Amana system. Upon arrival, confirmed water accumulation in drain pan with active dripping to floor despite previous remediation attempts. Documented standing water in pan with visible debris and staining indicating long-term moisture issues. System shows signs of extended lack of maintenance contributing to drainage failure. Replacement drain pan previously ordered; awaiting part arrival to complete permanent repair.
Responded to commercial single-story facility for no cooling complaint on 10+ year old rooftop unit. Upon arrival, accessed mechanical room and rooftop equipment to diagnose system failure. Found air handler in mechanical room non-operational with no airflow to conditioned space. Filter had not been serviced in 5-6 years, resulting in severely restricted airflow and system shutdown. Inspected rooftop condensing unit and associated ductwork, noting weather exposure and age-related wear on exterior components. Performed diagnostic testing on electrical components, refrigerant system, and airflow pathways. Documented equipment condition with photographic evidence showing mechanical room layout with ceiling-mounted ductwork and rooftop unit configuration. Secondary split system in office area confirmed operational, isolating issue to primary rooftop package unit serving main space.
Responded to no cool call for 21-year-old PTAC unit in Florida room. Upon arrival, found unit operational but cycling off prematurely and failing to maintain adequate cooling capacity. Performed diagnostic evaluation of compressor operation, refrigerant circuit, and thermostat controls showing 71°F setpoint with cooling mode engaged. Due to advanced age of unit beyond expected service life and intermittent cooling performance indicating likely compressor failure or refrigerant loss, recommended system replacement over repair. Discussed replacement options with homeowner who expressed interest in new unit installation.
Conducted on-site evaluation of existing water heater in basement utility area to provide replacement estimate. Assessed current tank-type water heater configuration, surrounding plumbing connections, available clearances, and venting requirements. Documented existing equipment specifications and installation conditions through photography. Discussed replacement options with customer including conventional tank water heater versus tankless water heater systems, reviewing advantages and considerations of each option based on household hot water demands and existing infrastructure. Provided comprehensive estimate for water heater replacement with equipment and installation specifications.
Conducted on-site evaluation for air conditioning condenser replacement at residential property. Assessed existing outdoor condenser unit positioned on concrete pad along exterior brick wall foundation, with electrical disconnect and conduit present. Inspected interior HVAC components including vertical and horizontal ductwork with reflective insulation in basement mechanical room. Documented current system configuration through photographs of outdoor condenser unit and indoor air distribution system. Provided estimate for new condenser installation to homeowner who was uncertain of existing unit's age and service history.
