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 21, 2026.
Job Locations and Reviews
Responded to no cooling complaint with indoor temperature at 80°F. Upon arrival, inspected outdoor condensing unit and indoor air handler system. Found clean air filter installed in return air vent with no airflow restrictions. Verified all electrical connections, refrigerant lines, and mechanical components at both indoor and outdoor units. System evaluated and determined to be operating within normal parameters with no mechanical failures or refrigerant issues identified.
Responded to service call for 22-year-old heating system with reported intermittent ignition issues identified during home inspection. Performed comprehensive diagnostic evaluation of furnace operation, including ignition sequence testing, flame sensor inspection, and control board functionality assessment. Evaluated outdoor condensing unit condition and overall HVAC system performance to ensure proper operation and identify any safety concerns or potential failure points given the age of the equipment.
Responded to no cooling complaint on 7-year-old system with thermostat set to 73°F and indoor temperature at 83°F. Found system running but producing warm airflow with no condensate drainage from unit. Cleared blocked condensate drain line that had restricted flow despite homeowner's previous attempts to clear obstruction. Verified proper drainage restored, system cooling effectively, and all electrical components including capacitor and Copeland diagnostic module functioning within normal parameters.
Responded to no cooling complaint on 5-6 year old residential split system. Upon arrival, found outdoor condenser unit humming but not operating properly, with system unable to maintain desired temperature. Performed diagnostic evaluation using digital manifold gauges, measuring system pressures at 117.6 PSI on low side and 307.2 PSI on high side. Pressure readings indicated refrigerant system imbalance contributing to inadequate cooling performance. Inspected condenser unit exterior condition, noting vegetation encroachment around concrete pad and equipment base requiring clearance maintenance for optimal airflow and operation.
Replaced failed blower motor assembly in HVAC system and verified proper operation. Conducted temperature diagnostics at supply register, confirming adequate airflow and system performance within manufacturer specifications.
Completed comprehensive HVAC replacement estimate for residential property with non-functioning air conditioning system. Assessed existing dark gray condenser unit positioned on concrete pad adjacent to brick exterior, evaluated electrical service including main panel with dual breaker columns controlling various household circuits including dedicated AC condenser circuit, and inspected associated components including meter housing, service panel box, gray conduit runs, and white PVC condensate drainage line. Documented all equipment specifications, electrical infrastructure capacity, mounting configurations, and replacement requirements through detailed photographic documentation to provide homeowner with complete system replacement options.
Conducted comprehensive HVAC system replacement estimate for residential property with homeowner present. Evaluated existing furnace, water heater, and air filtration system in basement mechanical room to provide Trane equipment replacement options. Documented current equipment configuration, ductwork connections, gas line routing, and spatial constraints through detailed photography for accurate system sizing and installation planning.
Responded to no cooling call on 6-year-old residential HVAC system. Found outdoor condensing unit not operating with thermostat set to 66°F and indoor temperature at 82°F. Performed diagnostic evaluation of electrical connections and components at outdoor unit. Inspected terminal block connections and verified no tripped breakers at panel. Indoor airflow confirmed operational with no ice buildup present at evaporator coil.
Completed annual Platinum Level maintenance on an 11-month-old HVAC system, including filter replacement with 16x25x4 media filter. Performed comprehensive system diagnostics with temperature differential measurements and electrical current readings using digital clamp meter to verify proper compressor and blower motor amperage. All system components operating within manufacturer specifications, and unit is ready for continued service.
Conducted comprehensive replacement estimate for non-operational HVAC system at residential property. Performed detailed measurements of existing air handler unit, documented current equipment condition including refrigerant lines and electrical components, and assessed thermostat functionality showing 67-degree reading on Emerson digital control. Provided homeowner with complete system replacement options and recommendations based on equipment age, visible wear patterns, and operational failure.
Responded to no cooling complaint on 6-year-old residential HVAC system experiencing reduced airflow and inability to maintain temperature setpoint. Performed diagnostic evaluation measuring supply air temperature at 57.4°F at register and return air conditions. System was found struggling to keep up with cooling demand, resulting in owner shutting unit down prior to arrival. Completed airflow assessment and temperature differential measurements to identify root cause of inadequate cooling performance.
Responded to no cooling complaint on residential HVAC system less than 10 years old. Upon arrival, confirmed system was cycling but maintaining inadequate temperature approximately 5 degrees above setpoint with airflow present but not cooling properly. Performed diagnostic testing and measured refrigerant subcooling at 9.4 degrees and supply air temperature at 65.8 degrees, indicating insufficient cooling capacity. System evaluation revealed performance issues requiring further assessment of refrigerant charge levels and cooling circuit operation to restore proper cooling function.
Successfully installed replacement control board on HVAC blower motor assembly, restoring full system operation. Previously diagnosed failed control board was sourced and installed, with all electrical connections verified and tested. System returned to normal cooling operation with proper airflow confirmed.
# Summary Responded to no cooling complaint on 15-year-old AC system. Diagnosed failed capacitor causing reduced cooling performance, replaced defective component and restored normal operation. # Work Performed Arrived on site to address cooling system malfunction with room temperature air at supply registers. Customer reported recent decline in cooling performance. Condenser unit was running but system was not producing cool air. No refrigerant line icing observed upon arrival. Performed visual inspection of outdoor condensing unit. Noted condenser coil had moderate fin damage with compressed sections affecting airflow efficiency. Vegetation growth near unit also restricting proper airflow. Condenser fan motor running but system not achieving proper cooling capacity. Conducted electrical diagnostics on condensing unit components. Used multimeter to test capacitor voltage and capacitance values. Testing revealed capacitor reading significantly below manufacturer specifications, in
Completed second annual Platinum Level maintenance on single HVAC system installed in November 2025. Performed comprehensive diagnostic testing using digital multimeter to verify electrical performance and system operation. Inspected condensate drain lines and connections, confirming proper drainage function and checking for blockages or leaks. All components operating within manufacturer specifications at time of service, and system is due for membership renewal.
Responded to callback for recurring basement flooding issue related to HVAC condensate drainage system. Upon arrival, inspected backup battery system and condensate pump assembly that was previously serviced. Verified Asurity backup battery unit was properly positioned and operational with indicator lights functioning, confirmed power connections secure, and tested pump operation to ensure proper condensate removal and prevent future flooding events.
Conducted follow-up visit to basement HVAC system for reported water leakage and previous no-cool condition. Verified system status following prior service call that identified low refrigerant charge with 78°F return air and 60°F supply air temperatures. Documented ductwork interior condition via photographs and coordinated with office regarding evaporator coil replacement estimate and leak detection service requirements.
Conducted comprehensive HVAC system replacement estimate at residential property. Assessed existing air handler unit installed in attic space with copper refrigerant lines, evaluated ductwork connections and clearance constraints in confined installation area. Inspected basement mechanical room including flexible duct routing, equipment accessibility, and structural considerations for new system installation. Documented current system configuration with copper line sets, existing ductwork infrastructure, and mounting locations to provide homeowner with complete replacement options and specifications. Confirmed replacement-only scope and completed full assessment within standard estimate timeframe.
Responded to no-cooling complaint on 7-year-old multi-zone system with indoor temperature at 79°F. Diagnosed and replaced failed capacitor on infant room unit, restoring proper operation. Addressed water accumulation in drain pan on second unit in same room. Verified both systems operational with proper airflow and cycling. Recommended preventive maintenance on all units due to system age and to prevent future failures.
Responded to service call for 2-year-old Lennox ML17XC1-036-230A01 heat pump system unable to maintain setpoint temperature of 69°F, with indoor temperature reading 70°F. Upon arrival, verified system operational status and conducted comprehensive diagnostics. Connected manifold gauge set to measure refrigerant pressures on R-410A system, confirming both high-side and low-side pressures were within manufacturer specifications for ambient conditions. Inspected outdoor condensing unit for proper operation, verified compressor and condenser fan motor functionality, and confirmed electrical specifications matched nameplate ratings of 208/230V, 1-phase, 60Hz. Assessed airflow at supply registers and verified thermostat calibration and settings. System found to be operating within normal parameters for extreme heat conditions, with only 1°F temperature differential indicating adequate performance. Educated property owner on realistic system capacity limitations during peak ambient temperatur
