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 30, 2026.
Job Locations and Reviews
Responded to no cooling complaint on 10-year-old system with warm air and low airflow from vents. Upon inspection, diagnosed failed dual run capacitor showing visible corrosion and oxidation on terminals and wire connections. Replaced defective capacitor with new unit, verified proper electrical connections, and tested system operation. Unit restored to normal cooling operation with proper airflow.
Conducted comprehensive replacement estimate at rental property for existing member whose current HVAC system is non-operational. Performed detailed load calculations using EDS software, determining cooling load requirements of 25,983 BTU and heating load requirements of 33,687 BTU based on structure characteristics including duct loss, ceiling, glass, wall, infiltration, and floor factors. Documented existing electrical panel configuration showing circuit breaker arrangement and confirmed adequate electrical infrastructure for replacement equipment installation.
Responded to no cooling complaint on upstairs system in newer home. Upon inspection, discovered failed contactor and blown fuses in outdoor condensing unit preventing compressor operation. Replaced defective contactor relay and multiple fuses in fuse block assembly, restoring proper electrical function to compressor circuit. Changed neglected air filter in master bedroom return grille located approximately 12 feet high. Verified system operation with proper airflow, compressor engagement, and adequate cooling capacity. Unit now operating within normal parameters and maintaining setpoint temperature.
Responded to service call for leaking water heater of unknown age. Upon inspection, found A.O. Smith Proline water heater with active leak at base of unit, though unit was still operational and producing hot water. Assessed condition of tank, plumbing connections, and pressure relief valve assembly. Documented existing installation including copper supply lines, proper venting, and current insulation configuration around lower portion of tank. Provided customer with assessment findings and recommended replacement due to age-related tank deterioration and active leak condition.
Conducted site assessment for ductwork insulation estimate in confined mechanical space. Documented existing conditions including uninsulated refrigerant lines, HVAC ductwork, and structural deterioration with moisture damage and staining on interior surfaces requiring attention prior to insulation installation.
Completed annual Platinum Level maintenance on a 1-year-old HVAC system during the first scheduled visit. Performed comprehensive system inspection and diagnostics using professional-grade testing equipment. Replaced 16x25x5 air filter as part of routine maintenance protocol. Utilized Klein Tools digital measuring device to verify temperature differentials and system performance metrics across ductwork and components. Employed True RMS multimeter (DL489) to test electrical parameters including voltage, current, and system functionality to ensure optimal operation. All measurements recorded within manufacturer specifications. System operating efficiently with no deficiencies noted. Documented findings with photographic evidence for service records.
Completed inspection of vintage-style shower and tub installation on second floor, verifying proper mounting and functionality of ornate brass fixture assembly with cross-handle controls, curved spout, and flexible shower hose. Ran new water supply lines through wall cavity for washer and dryer hookup, routing plumbing from second floor location with appropriate drainage considerations. All installations tested for leaks and proper water pressure, with fixtures operating within normal parameters.
Responded to after-hours service call to investigate system malfunction. Upon arrival, found indoor unit flashing green indicator light. Reset condenser disconnect switch, which restored system operation. Observed liquid line freezing and measured insufficient temperature split of approximately 12°F across both heads, indicating potential refrigerant or airflow issue. After condenser ramped up to full operation, rechecked temperature readings and confirmed improved split of 23°F (79°F return to 56°F supply). Advised occupant to maintain bedroom door open position to improve air circulation between zones and ensure proper airflow to primary occupied space. System left operational with monitoring recommended.
Upon arrival, identified a hose bib mounted on exterior brick wall with minor leakage at wall penetration point and evidence of previous water intrusion. Assessed interior access point and determined repair would require cutting into basement ceiling drywall, which was outside scope of work. Secured hose bib fixture directly to brick wall using anchoring hardware and applied silicone sealant around entire perimeter of wall penetration to prevent water infiltration and seal against environmental elements.
# HVAC Maintenance Summary Completed annual Platinum Level maintenance on a 6-year-old single-system residential HVAC unit. Performed comprehensive electrical diagnostics using digital multimeter to verify proper voltage, amperage, and capacitor functionality. Measured supply air temperature at 42.5°F, confirming adequate cooling performance. Inspected all electrical components including contactors, relays, and wiring connections. Replaced 16x20x5 air filter and verified system operation within manufacturer specifications.
Responded to service call for non-functional outdoor hose spigot attached to exterior wall and assisted with locating main water shut-off valve. Upon inspection, identified outdoor spigot fixture mounted on pink brick exterior wall at ground level. Successfully located main water shut-off valve in crawl space access point beneath structure, identifying blue-handled shut-off valve on water supply line along with associated PVC piping and plumbing infrastructure. Provided estimate for installation of interior shut-off valve as alternative to existing exterior yard valve location that requires access outside property fence line.
Completed on-site walkthrough and photo documentation for HVAC estimate preparation. Inspected existing mechanical systems in crawl space area, noting aged ductwork with deteriorated insulation and corroded piping requiring evaluation for replacement or repair. Interior laundry/utility room assessed for potential equipment placement and access considerations to facilitate estimate development.
Completed full system installation of a 3-ton Lennox 18 SEER upflow furnace with 99% AFUE fully modulating gas valve and matching air conditioning condenser. System features advanced modulating technology for enhanced comfort and energy efficiency. Installed new upflow furnace unit in mechanical room with proper venting and gas line connections. Mounted and wired control board with integrated circuit components, relays, and terminal connections for system operation. Connected all low-voltage control wiring including thermostat communication lines using color-coded wiring to terminal strip. Secured all electrical connections at terminal blocks and verified proper polarity. Installed outdoor condensing unit with refrigerant line set connections. Evacuated refrigerant lines to manufacturer specifications and charged system with appropriate refrigerant type and quantity. Verified proper subcooling and superheat measurements. Commissioned system and performed full operational testing. Ve
# Plumbing Maintenance - Tanked Water Heater Flush Performed comprehensive maintenance service on residential tanked water heater system located in attic space. Executed complete tank flush procedure to remove sediment buildup and mineral deposits from the bottom of the water heater tank, which is essential for maintaining heating efficiency and extending equipment lifespan. The service included shutting off the water supply and power to the unit, connecting a discharge hose to the drain valve, and systematically flushing the tank until water ran clear of sediment and debris. Collected discharge water in appropriate containers and inspected sediment levels to assess tank condition. The flush revealed moderate sediment accumulation, which is typical for units operating in areas with hard water or mineral-rich water supply. Following the flush procedure, inspected all plumbing connections including the copper supply lines with foam insulation, white PVC vent piping, and the circulatio
Responded to no cooling complaint on 3-year-old residential AC system with inadequate temperature output (66°F supply air versus expected 55°F). Upon arrival, performed diagnostic testing using digital clamp meter and infrared thermometer to measure electrical parameters and temperature differentials at the outdoor condensing unit. Verified system operation, recorded amperage draws, and documented supply air temperatures to identify cooling deficiency affecting the entire home.
Completed dismissed visit for planned HVAC maintenance on single residential system. Verified outdoor condensing unit condition and accessibility within protective cage enclosure. System filter size confirmed as 16x25x4 for homeowner reference. Unit operational with no immediate service requirements identified during visual inspection.
Conducted follow-up site visit to address incomplete installation items on HVAC system. Inspected refrigerant line penetration behind furnace where daylight was visible, indicating improper sealing that could allow air infiltration and energy loss. Documented unsealed pipe penetration to outdoor unit and missing access panel behind equipment. Verified ongoing condensation issue despite previous pipe insulation wrapping, and confirmed improper filter sizing in air handler unit. Photographed structural concerns including water damage evidence on foundation walls near copper refrigerant lines in crawlspace area, showing moisture infiltration patterns that may contribute to condensation problems.
Completed planned maintenance on HVAC system with filter inspection of 16x25x1 units aged 5 years and 22 years on monthly service schedule. Performed electrical diagnostics using digital multimeter to verify system performance and determined filters do not require replacement at this time.
Completed installation of AO Smith ProLine commercial-grade electric water heater with 40-gallon capacity in basement utility area. Connected copper supply lines with brass fittings, installed hot and cold water connections with appropriate shut-off valves, and completed electrical wiring connections via flexible metal conduit. Unit properly positioned on concrete floor with all plumbing connections secured and tested for proper operation.
Responded to no cooling complaint on unit less than 10 years old with history of recent thermostat replacement and repeated outages. Upon arrival, verified thermostat was blank with last reading at 75 degrees, confirmed no ice formation on refrigerant lines, and verified electrical supply at breaker panel. Performed system diagnostics using refrigerant manifold gauges, confirmed R410A refrigerant pressures with suction side reading 147 PSI and discharge side reading 294 PSI. Inspected condensate drain line and PVC fittings for proper drainage and potential blockages. System restored to normal cooling operation.
