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 24, 2026.
Job Locations and Reviews
Completed scheduled monthly maintenance on a 3-year-old single HVAC system. Performed electrical diagnostics using clamp meter at outdoor disconnect panel, verifying proper amperage and voltage readings. Measured supply air temperature with infrared thermometer at register, confirming system performance within normal operating parameters. Replaced 16x20x4 air filter as part of routine maintenance protocol.
Completed comprehensive HVAC system replacement estimate for residential property featuring roof-mounted air conditioning condenser unit and indoor furnace installation. Assessed existing equipment configuration including outdoor condenser positioned on elevated wooden platform with weathered support structure on asphalt shingle roof, and indoor closet-mounted gas furnace with metallic ductwork and plenum connection. Evaluated complete system replacement requirements, documented equipment specifications, measured installation parameters, and provided homeowner with detailed replacement options for both outdoor condensing unit and indoor air handler/furnace system to ensure proper sizing and efficiency standards are met for whole-home comfort solution.
Completed comprehensive HVAC estimate for cooling system replacement in medium-sized residential application (1600-2200 sq.ft.). Assessed existing basement installation consisting of furnace unit with associated ductwork and evaluated requirements for Lennox A/C coil vertical upflow/downflow configuration suitable for the existing infrastructure. Documented current equipment layout including furnace, air handler cabinet, PVC condensate piping, and supply ductwork to determine optimal replacement specifications and compatibility with proposed medium-capacity evaporator coil system.
Responded to install callback for system not cooling adequately with weak airflow. System installed late June, initial callback occurred end of June for same issue. Upon arrival, indoor temperature at 75°F with thermostat set to 70°F. Attic-located system assessed and diagnosed using manifold gauges, revealing abnormal refrigerant pressures and temperatures. Low side pressure reading 124.8 PSI with suction line temperature 62.6°F and superheat 14.5°F. High side pressure reading 280.7 PSI with liquid line temperature 91.9°F and subcooling 16.0°F. Identified failed TXV (thermostatic expansion valve) as root cause of insufficient cooling capacity. TXV photographed and documented for replacement part ordering. System currently non-operational. Return visit scheduled to replace TXV, estimated repair time 120 minutes. Customer informed of findings and repair plan.
Conducted on-site evaluation for converting 144 square foot screened porch to four-season room requiring climate control. Assessed existing electrical infrastructure and interior space to determine HVAC requirements for conditioned area with planned insulation and triple-pane window upgrades. Recommended ductless mini-split system installation as optimal solution for heating and cooling the enclosed space, documented electrical panel capacity for equipment compatibility, and photographed existing ceiling structure and ventilation layout for system design specifications.
Completed monthly platinum level maintenance on single HVAC system. Performed comprehensive system inspection, recorded temperature readings showing 202°F discharge temperature, and assessed overall equipment operation. Noted customer requires new 16x20x5 filter for continued optimal system performance, as current filter media shows standard usage wear consistent with monthly service interval.
Conducted comprehensive replacement estimate for five aging split system HVAC units approximately 22 years old, including four 3-phase units and one single-phase unit. Assessed existing Trane air handler installations (Units 5 and 6 documented) in mechanical room with associated ductwork, drainage systems, and electrical infrastructure. Evaluated electrical panel configuration and power requirements to determine compatibility for new equipment installation and verified existing 3-phase and single-phase service capabilities for proper system replacement planning.
Returned to property to replace blower motor belt that had previously been identified as excessively loose and subsequently jumped off the pulley, causing unit failure. Removed old belt, installed new replacement belt, and verified proper tension and alignment on motor pulley and blower assembly. Unit tested and confirmed operational with blower running smoothly.
Completed annual Platinum Level maintenance on 6-year-old HVAC system during second visit. Performed comprehensive system diagnostics using digital multimeter to verify electrical parameters and IR thermometer to measure temperature readings at 74.5°F on refrigerant lines. Replaced 16x20x5 air filter, inspected all system components, and confirmed proper operation of all mechanical and electrical systems. System is operating within manufacturer specifications and customer approved contract renewal for continued maintenance coverage.
Completed fall maintenance visit on dual-system home under Platinum service agreement. Performed comprehensive inspection and service of indoor air handler unit, including cleaning of all burners, flame sensor maintenance, and operational verification of boiler system to ensure optimal efficiency. Checked heat pump operation and verified electric heat strips in air handler are functioning properly, confirmed blower motor operation meets manufacturer specifications. Inspected outdoor heat pump unit, verified proper operation of compressor and fan motor, checked refrigerant levels and electrical connections. Tested boiler pump operation and confirmed proper circulation throughout heating system. Both systems operational and performing to specifications upon completion of maintenance procedures.
Completed Platinum Level planned maintenance on a one-year-old single HVAC system. Performed comprehensive system inspection, verified operational parameters with temperature readings at 70°F, inspected blower assembly and nameplate (Model ML19GUH070XE48B-53), and documented equipment condition through photographic records. All maintenance tasks completed per manufacturer specifications with system operating within normal parameters.
Responded to install callback for water leak and clicking noise on recently installed system. Upon arrival, assessed unit and confirmed low refrigerant charge as previously noted. Used digital manifold gauges and temperature probes to verify system pressures and operating temperatures. Scheduled follow-up leak search, repair, and proper refrigerant recharge to factory specifications per install team recommendation.
Completed estimate for HVAC ductwork replacement project involving conversion from existing rigid pipe to flexible duct system. Accessed attic space through ceiling opening to assess current ductwork configuration, which included aged metal ductwork with reflective insulation secured by metal strapping to wooden joists. Evaluated structural conditions, existing duct routing, and installation requirements for proposed flex duct replacement to ensure proper airflow and system efficiency.
Responded to callback for recent HVAC installation experiencing condensation issues and steady dripping around furnace. Upon arrival, discovered severe ice and frost buildup on upper portion of air handler unit, indicating restricted airflow causing evaporator coil to freeze. Inspected condensate drainage system including PVC piping and confirmed proper installation but identified airflow restriction as root cause of excessive condensation. Verified system was operational at 73 degrees but running inefficiently due to frozen coil. Documented conditions with photos showing extensive frost accumulation on top panel and edges of unit. Addressed airflow issue, allowed coil to thaw, and verified proper condensate drainage through existing PVC system to resolve dripping concern.
Completed replacement of existing PTAC unit with new 15,000 BTU wall-mounted system. Installed unit in existing wall sleeve, verified proper electrical connections, and tested all operational functions including cooling cycle, thermostat controls, and airflow distribution to ensure system performance meets manufacturer specifications.
Conducted comprehensive HVAC replacement estimate for residential property with non-functional air conditioning system and aging, poorly operating furnace. Evaluated existing low-voltage thermostat wiring and connections, assessed main electrical panel capacity and breaker configuration to determine compatibility for new equipment installation. Documented current system conditions including extended reliance on window units for cooling, photographed electrical infrastructure and control components, and provided homeowner with complete replacement options for both heating and cooling systems.
Completed installation of twinned 3-ton AC system in attic space, installing two 14-inch wide 3-ton cased evaporator coils on existing 80% efficiency furnaces. Fabricated and installed 20x12 return air drop measuring 55 inches with 1-inch filter rack for left-hand furnace. Connected refrigerant lines to both units, secured all piping with proper insulation and strapping, and verified system operation. All ductwork connections sealed and equipment positioned to accommodate existing 33.5-inch furnace height with 30-inch clearance to supply plenum.
Conducted on-site evaluation for ductless mini-split system installation to provide climate control for office space and potentially living room area. Assessed exterior wall conditions and electrical infrastructure including main service panel with adequate breaker capacity available. Documented existing utility meter location and suitable mounting areas on gray vertical siding for outdoor condenser unit placement near deck structure. Current HVAC system operational; homeowner seeking expansion of conditioned space rather than replacement of existing equipment.
Responded to callback for condensation issue on recently installed furnace system. Upon arrival, verified unit was operational for both heating and cooling functions. Conducted temperature diagnostics using digital thermometer at multiple points on ductwork and air handling components, recording supply air temperatures of 58.7°F and 50.7°F at different locations. Inspected condensate drainage system, drain lines, and trap assembly for proper installation and function. System remains functional pending customer's rescheduled appointment for further evaluation and resolution of condensation concern.
Responded to no-cooling call on approximately 10-year-old York condenser unit that was completely inoperative. Upon arrival, performed diagnostic evaluation of the non-functioning system and documented unit condition with exterior photographs showing condenser placement, electrical connections, and refrigerant line routing. Assessed electrical components including conduit runs and junction boxes mounted on building exterior. Inspected concrete pad condition and noted normal weathering consistent with system age. Completed visual inspection of second unit experiencing rapid cycling issues to determine service priorities. Documented both systems for maintenance records and provided recommendations for restoring cooling operation to primary unit.
