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 13, 2026.
Job Locations and Reviews
Responded to service call for non-operational air conditioning system where outdoor unit was producing noise but condenser fan failed to spin. Upon inspection, diagnosed failed condenser fan motor on aging outdoor unit and evaluated overall system condition including RGF HALO LED air purification system and Honeywell Home ProSeries thermostat. Provided comprehensive estimate for complete system replacement due to age and condition of existing equipment, though discussed repair options with property owner as alternative solution.
Completed second annual Platinum Level maintenance visit on a 4-year-old HVAC system. Performed comprehensive system diagnostics including electrical testing with digital multimeter, verifying voltage readings at capacitor and electrical connections. All measurements within normal operating parameters. Inspected and tested all major components, replaced 20x25x5 filter, and confirmed system operating efficiently.
# Water Heater Maintenance Service Performed comprehensive tanked water heater flush on A.O. Smith residential unit located in basement utility area. Conducted complete system drainage to remove sediment buildup and mineral deposits from tank interior, which improves heating efficiency and extends equipment lifespan. Connected garden hose to drain valve at base of unit and opened valve to flush accumulated sediment from tank bottom. Allowed water to run until discharge was clear, indicating thorough removal of debris. Inspected cold water supply line with blue-handled shut-off valve for proper operation and verified all copper piping connections at top of unit for signs of corrosion or leaks. Examined temperature and pressure relief valve for proper function and checked that discharge tube was properly positioned. Verified all manufacturer labels and specifications remained legible on unit exterior. Inspected surrounding plumbing infrastructure including exposed copper lines and ga
Completed annual preventive maintenance on one-year-old residential air conditioning system. Performed comprehensive AC tune-up including electrical diagnostics with multimeter, verified system operating parameters, and measured temperature readings to confirm proper cooling performance. Delivered requested furnace filters to customer and confirmed all components functioning within normal specifications with no issues identified during routine inspection.
Completed comprehensive plumbing service including installation of new tub and shower faucets in bathroom, replacement of outdoor hose faucet, and installation of new wax ring seal on toilet to prevent leaks. Inspected all bathroom faucet connections for proper operation and potential leaks. Additionally, checked gas line integrity and installed new gas log set in fireplace, ensuring proper ventilation and safe operation of all gas connections throughout the property.
Conducted comprehensive evaluation of existing HVAC system that was failing to adequately condition the living space. Assessed furnace, air handler, and associated ductwork in utility area to determine equipment condition and replacement requirements. Documented current electrical panel configuration and circuit capacity to ensure proper integration of new HVAC equipment. Prepared detailed estimate for complete system replacement including removal of outdated equipment, installation of properly sized heating and cooling units, and verification of adequate electrical service for upgraded system.
Responded to callback for air conditioning system not cooling properly. Upon arrival, confirmed inadequate cooling with supply air temperature measuring 79.1°F at the ductwork. Performed electrical diagnostics on outdoor condensing unit, measuring compressor amperage at 0.96 amps, which indicates the compressor is not running under normal load conditions. Identified electrical or mechanical failure preventing proper compressor operation. System requires further diagnosis to determine root cause of compressor malfunction, which may include failed start components, refrigerant issues, or internal compressor failure. Documented findings with thermal and electrical measurements for follow-up service requirements.
Responded to no cooling complaint with indoor temperature at 85°F on 3-year-old air conditioning system. Performed electrical diagnostics at outdoor condensing unit using clamp meter to measure amperage and verify proper power supply to compressor and condenser fan motor. Accessed electrical compartment, tested voltage at contactor and capacitor terminals, and verified all wire connections were secure. System found operating with correct electrical values; diagnosed and resolved cooling deficiency, restoring proper operation and airflow throughout residence.
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.
