Louisville Service Overview
- Local Priority: A+ Derr proudly provides four core trades—heating, cooling, plumbing, and electrical—across Shively, St. Matthews, Hurstbourne, Indian Hills, Middletown, Jeffersontown, Old Louisville, and the Highlands.
- Certified Expertise: We offer complete multi-trade services, handling historic boiler repairs and panel upgrades near the urban core to EV charger installations and high-efficiency heat pumps in eastern Jefferson County.
- Efficiency Focus: Our technicians understand the specific mechanical differences between century-old Highlands properties with narrow spaces and expansive newer homes beyond the Watterson Expressway and Gene Snyder Freeway
From older homes along Bardstown Road and Dixie Highway to newer neighborhoods beyond the Watterson Expressway, Louisville properties place different demands on their heating, cooling, plumbing, and electrical systems. A+ Derr serves homeowners throughout Louisville, including Shively, St. Matthews, Hurstbourne, Indian Hills, Middletown, and Jeffersontown. With technicians and service vehicles operating across the city every day, help is never far away.
“Definitely had no complaints from start to finish. From sales to install date everyone was professional and friendly. Definitely recommend giving them a chance. New system works and sounds great. Brad did a great job from the sales side and very personal and professional. Tanner was professional, great and knowledgeable. Definitely a great team they have there.”
Donald B.
Need an experienced HVAC contractor, plumber, or electrician in Louisville, KY? Call 833-232-4328 or contact us online today!
Heating, Cooling, Plumbing & Electrical Services Built for Louisville, KY
Louisville is one of A+ Derr’s primary operating markets. Our technicians regularly travel between neighborhoods near the Ohio River, the University of Louisville, Iroquois Park, Shelbyville Road, Bardstown Road, and the growing communities east of the Gene Snyder Freeway.
That daily presence matters because Louisville does not have one standard type of home. Properties near Old Louisville and the Highlands may have narrow mechanical spaces, older pipes, aging electrical panels, and ductwork added long after construction. Homes in Middletown, Hurstbourne, and Jeffersontown often have newer infrastructure, larger floor plans, and greater demand for high-efficiency systems, EV chargers, smart controls, and backup power.
A+ Derr also supports local organizations, including the Louisville Bats, Louisville City FC, and the Animal Care Society. We live and work in the same region as our customers, and we understand the conditions Louisville homes face throughout the year.
Louisville Home Comfort Problems & Proven Solutions
Problem: Historic homes in Old Louisville, NuLu, and the Highlands feature original architecture, converted rooms, and restrictive ductwork that cause severe second-floor heat in summer and uneven winter heating.
Solution: A+ Derr designs custom multi-trade solutions, combining high-efficiency heat pumps, ductless mini-splits, boiler services, and airflow balancing to deliver modern comfort while preserving structural integrity.
Problem: Aging electrical panels and limited circuit capacity in older properties along Bardstown Road, Shively, and Dixie Highway cannot support modern appliances, kitchen remodels, or new HVAC installations.
Solution: Our licensed electricians evaluate total power capacity to complete electrical panel upgrades, meter upgrades, rewiring, surge protection, and dedicated circuits.
Problem: Heavy seasonal downpours and low-grade foundations across Jefferson County lead to basement flooding, sewer line backups, and drainage failures.
Solution: Our master plumbers install and service primary sump pumps, clear restrictive drain lines, replace failing water heaters, and execute repiping projects.
Problem: Persistent summer humidity along the Ohio River combined with sudden winter cold snaps strains HVAC systems, reducing efficiency and driving up energy bills.
Solution: We install whole-home dehumidifiers, air purifiers, variable-speed heat pumps, and high-efficiency furnaces to manage moisture and maintain consistent indoor comfort year-round
Furnace Repair & Boiler Service for Louisville’s Changing Winters
Louisville winters often move between mild afternoons, freezing nights, rain, ice, and sudden cold snaps. Those swings can force furnaces and heat pumps to cycle frequently, especially in drafty homes near the urban core or larger properties in eastern Jefferson County.
A+ Derr provides:
- Furnace repair for Louisville cold snaps
- Heating installation for older floor plans
- System replacement for aging urban homes
- Maintenance before Jefferson County freezes
- Boiler service for historic properties
- Heat pumps for Kentucky’s changing seasons
- Mini-splits for attics and additions
- Geothermal options for larger properties
- 24- Hour Emergency heating across Louisville
- Air quality help for dry winter homes
Homes near Bardstown Road, Shively, and Iroquois Park may have additions, converted rooms, or duct systems designed for an earlier floor plan. A+ Derr checks the equipment, airflow, insulation, and home layout before recommending a repair or replacement, which helps prevent homeowners from investing in a new system that leaves the original comfort problem unresolved.
“We were very satisfied with our installers, Brian Abbott and Keith. They installed air conditioning unit and furnace. They answered all questions asked, very knowledgeable. We highly recommend A+ Derr Heating and AC to do your next job.”
Rhonda S.
Emergency AC Repair & Humidity Control Along the Ohio River
Louisville summers are hot and humid, with long stretches when air conditioners run throughout the day. The city’s moisture levels can make indoor air feel uncomfortable even when the thermostat reaches its setting. Homes near the Ohio River may notice persistent humidity, while upper floors in older neighborhoods often remain warmer because of limited insulation or restrictive ductwork.
Our cooling services include:
- AC repair during humid Louisville summers
- Cooling installation for multi-level homes
- AC replacement for aging city properties
- Maintenance before peak summer heat
- Mini-splits for hot upstairs rooms
- Heat pumps for year-round comfort
- Dehumidifiers for Ohio River moisture
- Air purifiers for pollen and dust
- Duct cleaning for older Louisville homes
- Insulation for hot attics
- Emergency cooling across Jefferson County
A historic home near Cherokee Park may need duct or insulation improvements to cool the second floor, while a larger home in Indian Hills or Hurstbourne may benefit from zoning, airflow corrections, or humidity control. Our technicians evaluate the entire cooling system instead of assuming the outdoor unit is the only source of the problem.
“A+ Derr did a great job installing my new gas furnace and 17 SEER air-conditioning unit. They were very professional, kind, and efficient. I look forward to using my new HVAC system in my new home. They also installed a similar unit in my current home about three years ago. The maintenance team on that system has been wonderful and Alfonso has been especially kind. Thank you, Tanner, for installing my new unit and keeping me up-to-date with how the installation was going.”
Debra P.
Is your air conditioner struggling with Ohio River humidity or cold winter freezes? Call 833-232-4328 to book high-efficiency heating and cooling service!
Louisville Plumbing Services: Sump Pumps, Water Heaters & Drain Repair
Louisville’s plumbing infrastructure reflects decades of residential growth. Older properties near Downtown, NuLu, the Highlands, and south Louisville may contain aging supply lines, remodeled bathrooms, narrow drains, or piping installed during several different renovations. Newer homes can still experience clogged drains, failed water heaters, leaking fixtures, and sump pump problems.
A+ Derr provides:
- Leak repair in older Louisville homes
- Plumbing installation for local remodels
- Maintenance for aging city pipes
- Water heaters for busy households
- Tankless systems for limited spaces
- Sump pumps for Louisville basements
- Drain service for older sewer lines
- Garbage disposal repair and replacement
- Toilet repair for recurring problems
- Repiping for outdated plumbing materials
- Water filtration for Louisville homes
Heavy rain can expose drainage weaknesses around Louisville homes, especially those with basements or foundations below the surrounding grade. A worn sump pump, blocked discharge line, or recurring sewer problem can quickly lead to water damage. Our plumbers identify the source and explain whether a focused repair or broader plumbing upgrade offers the stronger long-term solution.
Electrical Panel Upgrades, Wiring & EV Chargers in Jefferson County
Many Louisville homes were built before modern electrical use became standard. Older properties near Old Louisville, Shively, and the Highlands may have limited circuits, outdated panels, or wiring altered during past renovations. Newer homes around Middletown and Jeffersontown often need added capacity for EV chargers, home offices, connected equipment, and larger appliances.
Our electrical services include:
- Electrical repair in aging Louisville homes
- Wiring for remodels and additions
- Panel upgrades for older neighborhoods
- Meter upgrades for increased demand
- Circuits for kitchens and home offices
- Outlet service for renovated properties
- EV chargers in eastern Louisville
- Generators for storm-related outages
- Surge protection for home electronics
- Lighting for homes and businesses
- Commercial lighting across Louisville
An older home near Bardstown Road may need a panel upgrade before a new HVAC system or kitchen appliance can be added. A newer property beyond the Watterson may require an EV charger, generator connection, or additional circuits. A+ Derr evaluates the home’s existing capacity before completing the installation, helping reduce overloaded circuits and future electrical problems.
Need an electrical panel upgrade or sump pump repair in Louisville? Call our multi-trade specialists at 833-232-4328 for fast, professional service!
Serving Louisville ZIP Codes: From the Highlands to Middletown
Louisville covers a large area, from Downtown and the Highlands to Shively, St. Matthews, Middletown, Jeffersontown, and neighborhoods near the Gene Snyder Freeway. A+ Derr provides heating, cooling, plumbing, and electrical service across the Louisville area, including homes and businesses in many of Jefferson County’s primary residential ZIP codes.
Our Louisville service area includes:
- 40202, 40203, and 40204
- 40205, 40206, and 40207
- 40208, 40209, and 40210
- 40211, 40212, and 40213
- 40214, 40215, and 40216
- 40217, 40218, and 40219
- 40220, 40222, and 40223
- 40228, 40229, and 40241
- 40242, 40243, and 40245
- 40258, 40272, 40291, and 40299
Each ZIP code contains its own mixture of home ages, construction styles, neighborhoods, and system needs. A property near Downtown Louisville may require a different HVAC, plumbing, or electrical approach than a newer home in eastern Jefferson County.Â
Why Louisville Homeowners Choose A+ Derr
Louisville homeowners need more than a company that places the city name on a service page. They need technicians who understand how a century-old Highlands home differs from a newer property in Middletown, how humidity affects comfort near the river, and why heavy rain makes sump pump performance important.
Customers choose A+ Derr for:
- Daily service coverage across Louisville
- Experience with historic city homes
- Support for newer eastern neighborhoods
- Four home trades under one company
- Emergency HVAC service in Jefferson County
- Solutions for local weather conditions
- Clear recommendations for aging systems
- Active Louisville community involvement
Whether your home sits near Dixie Highway, Shelbyville Road, Bardstown Road, the Watterson Expressway, or the Gene Snyder Freeway, our team can provide service based on the needs of your property and neighborhood.
Schedule Home Services in Louisville, KY Today
A failed air conditioner during a humid July afternoon, a furnace problem during a sudden freeze, a sump pump concern after heavy rain, or an overloaded panel in an older home all require timely attention. A+ Derr provides complete heating, cooling, plumbing, and electrical service throughout Louisville and Jefferson County.
Serving the Highlands, St. Matthews, Middletown, Shively, and all of Jefferson County. Call 833-232-4328 to schedule your service with A+ Derr!
Louisville HVAC & Plumbing FAQs
Why do older Highlands and St. Matthews homes benefit from zoning or mini-splits?
Multi-story and shotgun floor plans frequently suffer from uneven airflow[cite: 10]. Zoning uses dampers and dedicated thermostats—or supplemental ductless mini-splits—so upper levels cool comfortably in summer without over-cooling the main floor[cite: 10].
What indoor humidity level should I target during Ohio Valley summers?
Aim for 40% to 50% relative humidity. Persistent river moisture makes indoor air feel warm even when the thermostat hits its target[cite: 10]. Combining your AC with a whole-home dehumidifier improves comfort and energy efficiency[cite: 10].
Can a heat pump handle Louisville's changing winter weather?
Yes. Modern heat pumps provide efficient cooling and economical heating during mild spring and fall conditions[cite: 10]. Many homeowners opt for a dual-fuel setup that pairs a heat pump with a gas furnace for deeper winter freezes[cite: 10].
Why do older Louisville homes require electrical panel upgrades before adding new HVAC systems?
Properties in older neighborhoods like Old Louisville, Shively, or the Highlands often have limited circuit capacity[cite: 10]. Upgrading your electrical panel ensures your home can safely support modern HVAC units, EV chargers, or kitchen remodels without tripping breakers[cite: 10].
Why is sump pump maintenance critical for Louisville basements?
Heavy seasonal rainstorms put significant pressure on home foundations across Jefferson County[cite: 10]. Routine inspections ensure primary sump pumps and discharge lines work properly during heavy storms, preventing costly water damage[cite: 10].
What is considered an HVAC or plumbing emergency in Louisville?
Complete loss of heat/cooling during extreme weather, burning odors, repeated breaker trips, or standing water near electrical and plumbing fixtures require immediate attention[cite: 10]. Shut the system down and contact us right away[cite: 10].
Page Updated on August 10, 2026
Recent Jobs and Reviews in Louisville, KY
Louisville, KY at a glance
A+ Derr Heating & Cooling has completed 20 jobs in Louisville, KY in July 2026.
The most recent job was on July 29, 2026.
Job Locations and Reviews
Completed scheduled preventative maintenance on air conditioning system as part of planned HVAC tune-up service. Performed comprehensive system inspection with no pre-existing issues or symptoms reported. Utilized digital clamp meter to verify electrical current readings, measuring 4.68 amps with 0.480 secondary reading, confirming proper compressor amperage draw within manufacturer specifications. Measured supply air temperature at 46°F using infrared thermometer at air handler unit, verifying adequate cooling performance and proper refrigerant charge. Inspected outdoor condensing unit components, indoor air handler, ductwork, and associated electrical connections. All system components operating within normal parameters with no deficiencies noted during inspection.
Responded to no cooling complaint on 7-year-old Goodman system experiencing short cycling behavior. Upon arrival, confirmed thermostat was calling for cooling but unit would attempt to start then immediately shut down after a few seconds. Performed diagnostic testing and identified failed Nidec compressor module (P/N: M055PMCTJ-0284, Goodman P/N: 0131M00178). Replaced defective compressor control module, restored power, and cycled system through multiple start sequences to verify proper operation. Unit now running normally with appropriate cooling cycle and no short cycling observed.
Responded to service call for tripped breaker on unit #2. Found electrical breaker in tripped position, reset breaker and restored power to system. Performed system check and replaced air filter. Inspection revealed all three outdoor condensing units severely clogged with debris, restricting airflow. Identified overheating condition on one outdoor unit causing thermal overload and repeated breaker trips due to inadequate airflow through condenser coils. Documented electrical readings showing amperage draw of 33.9A and 22.76A with voltage reading of 60.75V during diagnostic testing. Maintenance service scheduled for all three systems to include thorough cleaning of outdoor units and complete system evaluation. Tenant requested presence during future maintenance visit for unit #2.
Completed full HVAC system installation consisting of a 5-ton Lennox 15.2 SEER air conditioning unit paired with an 80% AFUE upflow gas furnace in basement utility space. Installed air handler with evaporator coil, connected flexible metallic ductwork, verified proper unit leveling, and ensured all components meet manufacturer specifications and code compliance requirements.
Replaced existing rigid round ductwork with flexible ducting in attic space. Accessed work area through ceiling opening, removed deteriorated round pipe, and installed new flex duct to restore proper airflow to affected zone.
Responded to no-power condition on downstairs cooling unit. Upon arrival, confirmed system was completely inoperative with no fan operation. Diagnosed failed contactor preventing compressor and condenser fan operation. Replaced defective contactor with new component, verified proper voltage at 242V, and tested system operation. Unit restored to normal cooling function with all components operating within specifications.
Performed routine maintenance flush on tanked water heater to remove sediment buildup and ensure optimal performance. Unit was drained completely, flushed with fresh water until discharge ran clear, then refilled and returned to normal operation. All connections, gas line, and safety labels were verified to be in proper working condition upon completion.
Responded to no cooling call on 10+ year old system with indoor temperature at 79°F despite thermostat set to 70°F. Upon arrival, performed comprehensive diagnostic evaluation of the air conditioning system using refrigerant manifold and micron gauge. Connected diagnostic equipment to outdoor condenser unit and recorded system pressures and temperatures to assess refrigerant charge levels and compressor performance. Measurements indicated operating pressures of 124.8 PSI and 133 PSI with ambient temperature readings of 108.2°F at condenser and 98.3°F discharge line temperature. Verified electrical components, checked for tripped breakers, and confirmed condenser fan motor operation. Conducted thorough system analysis to identify root cause of cooling failure and provided recommendations for necessary repairs to restore proper cooling function.
Conducted on-site evaluation for electric water heater replacement following failure of 15-year-old unit. Assessed existing Lochinvar electric tank water heater installation in basement utility area, documented current equipment specifications and plumbing connections, and provided estimate for replacement with appropriately-sized electric tank water heater based on household requirements.
# HVAC Service Completed Responded to no-cool call on 3-year-old air conditioning system with outdoor fan motor failure. Customer reported air movement from vents but outdoor unit fan not operating, with issue beginning the previous evening. No ice buildup, error codes, unusual noises, or odors were present at time of service call. Upon arrival, performed visual inspection of outdoor condensing unit and confirmed fan motor was not running while indoor blower continued to operate. Removed electrical panel cover to access contactor and control wiring. Used digital multimeter to test voltage at multiple points in the electrical circuit, including contactor coil and fan motor connections. Testing revealed Sensata relay/contactor experiencing electrical fault preventing proper fan motor operation. Verified incoming power supply was within normal parameters and checked all wire terminations for secure connections and proper torque. Inspected wiring harness including red, black, yellow, gr
Completed comprehensive plumbing estimate for tankless water heater replacement at residential property. Evaluated existing gas-fired tank-style water heater installation in basement, documenting current configuration including copper supply lines, yellow flexible gas line connection, and PVC venting system. Assessed exterior utility connections and electrical service capacity for potential tankless unit installation. Photographed current equipment condition and utility infrastructure to provide detailed proposal with financing options for upgrading to high-efficiency tankless water heating system.
Conducted replacement estimate for 18+ year old HVAC system with non-functional outdoor fan motor due to overheating condition. Evaluated existing basement installation including electrical panel capacity, ductwork configuration, and system accessibility for replacement equipment. Documented current system conditions and provided comprehensive replacement options for aging unit that homeowner has temporarily disabled to prevent further damage.
Completed full HVAC system replacement estimate for 15+ year old residential cooling system that had failed. Assessed existing gas furnace installation in basement with metallic ductwork configuration and outdoor cylindrical air conditioning condenser unit showing significant age-related wear and weathering. Provided comprehensive replacement-only options for complete system upgrade to restore cooling functionality to the property.
Completed full HVAC system installation with proper leveling and alignment verification of all components. Performed precision measurements and quality checks on newly installed equipment, ensuring optimal system performance and compliance with manufacturer specifications. All electrical connections, circuit boards, and control components were properly installed and tested for functionality.
Installed a new 50-gallon tall A.O. Smith gas water heater with proper copper supply line connections, venting, and gas line hookup including safety valve installation. Unit was set in place on concrete foundation, all connections were tested and verified operational, and customer was provided with manufacturer warranty information.
Responded to service call for non-functioning air conditioning system with indoor temperature reading 79°F while thermostat set to 67°F. Customer reported outdoor unit humming but compressor not starting, while indoor blower fan operating normally. Upon arrival, performed diagnostic evaluation of 5-6 year old HVAC system. Inspected outdoor condensing unit and confirmed compressor failure to engage despite proper fan operation. Examined indoor air handler and ductwork installation, noting normal dust accumulation consistent with system age. Documented equipment condition with photographs showing furnace assembly, ductwork configuration, refrigerant lines, and electrical connections. Provided estimate for necessary repairs to restore cooling functionality.
Responded to no-cooling call on 5-6 year old Carrier system with indoor temperature reading 79°F. Upon arrival, confirmed outdoor condenser fan motor was inoperative while compressor hummed, indicating failed condenser fan motor. Inspection of outdoor unit revealed severely deteriorated ductwork with extensive rust corrosion and structural failure, including large hole penetration in metal housing compromising system integrity. Documented equipment condition showing advanced oxidation and moisture damage throughout condensing unit cabinet and associated components.
Completed installation of a 2.5-ton 80% AFUE complete HVAC system. System startup confirmed proper operation with control board displaying normal status codes and temperature readings verified at 86.6°F during commissioning. All electrical connections secured at terminal block and system tested for proper functionality.
Completed comprehensive tune-up on HVAC system for customer who won complimentary service through community baseball game promotion. Performed full system inspection including electrical components, contactors, capacitor, and condensate drainage system. All components found operating within normal parameters with unit showing typical wear patterns for age; cleaned and verified proper operation of all mechanical and electrical systems.
Responded to report of excessive condensation and inoperative exhaust fan in lower level bathroom. Upon inspection, found ceiling-mounted combination ventilation and lighting fixture with failed fan motor causing inadequate air circulation and resulting moisture accumulation. Documented existing conditions with photographs showing the installed diffuser assembly and interior mounting components.
