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 3, 2026.
Job Locations and Reviews
Completed full air conditioning system installation including new outdoor condensing unit and indoor evaporator coil. Verified proper refrigerant charge levels and system pressures using digital manifold gauges, confirming optimal performance parameters. Tested airflow at supply registers to ensure adequate distribution throughout the space, with all readings meeting manufacturer specifications for proper system operation.
Responded to callback for ongoing system issue. Successfully installed new condensate pump to resolve drainage problem affecting HVAC operation. Unit tested and confirmed operational upon completion.
Completed follow-up service visit to address previously identified HVAC system repairs. Removed and inspected blower assembly housing with centrifugal squirrel cage fan, noting dust accumulation on fan blades and interior surfaces requiring cleaning. Disassembled ductwork components including metal transition piece with oval cutout for thorough assessment and repair work as originally quoted.
Conducted comprehensive on-site evaluation for complete HVAC system replacement estimate including outdoor condensing unit, indoor furnace, and water heater. Inspected existing air conditioning unit positioned on concrete pad against exterior brick wall, assessed electrical disconnect and refrigerant line routing. Evaluated indoor air distribution system including return air grille and ductwork accessibility. Documented current equipment conditions through photographic records to support multiple estimate scenarios: full HVAC and water heater replacement, furnace-only replacement, and water heater-only replacement. Provided customer with detailed options for equipment upgrade paths based on system assessment.
Completed follow-up visit to finalize previously incomplete HVAC installation work. Installed ceiling-mounted supply register with white grille in exposed beam ceiling area, verified proper ductwork connections, and documented final system configuration. All outstanding installation tasks have been completed and system is operational.
Responded to no cooling complaint where system was blowing air but unable to maintain setpoint, with indoor temperature reading 74-78°F while thermostat set to 70°F. Performed diagnostic evaluation of HVAC system, inspected ductwork and measured supply plenum conditions. System showed adequate airflow through vents with blower operation confirmed, indicating compressor or refrigerant circuit issue requiring further assessment of outdoor unit components and refrigerant charge levels.
Completed comprehensive replacement estimate for residential property with three HVAC systems, focusing on one non-operational 21-year-old unit requiring full system replacement. Evaluated existing Lennox equipment installation in utility closet, including air handler with cylindrical plenum, flexible ductwork connections, electrical service, and PVC condensate drainage system. Documented current system configuration and provided replacement options per homeowner request for equipment upgrade only.
Responded to concern regarding inadequate cooling in front bedroom of residence with 2-year-old HVAC system. Performed visual inspection of supply register and ductwork serving affected area. Inspected ductwork routing through underfloor cavity, examining main trunk line and branch connections for potential airflow restrictions, disconnections, or damper issues. Verified supply vent condition and assessed air distribution pattern in bedroom. Documented existing ductwork configuration and structural layout for reference.
Responded to no cooling complaint on 5-year-old residential HVAC system with thermostat set to 76°F but indoor temperature reading 80°F. Upon arrival, verified system was not cooling and no breakers had tripped. Connected digital manifold gauges to measure refrigerant pressures, which revealed abnormal readings of 141.8 psi on low side and 308.2 psi on high side. Diagnosed failed dual-run capacitor as root cause of cooling failure. Removed defective 40/7.5 MFD 440VAC capacitor and replaced with new unit to restore proper compressor and condenser fan motor operation. System tested and verified operational with proper cooling restored.
Assessed non-functional air conditioning system that is approximately 17 years old and provided replacement estimate. Documented existing HVAC equipment configuration including furnace installation and ductwork layout in utility area for sizing and equipment specifications.
Completed comprehensive replacement estimate for residential HVAC system. Evaluated existing outdoor condensing unit showing significant weathering and oxidation on copper components, along with indoor air handler installation in utility closet with aging flexible ductwork and associated drainage systems. Documented current equipment condition, assessed installation location accessibility, and provided homeowner with complete system replacement options to address non-functional heating and cooling equipment.
Responded to no cooling complaint on 5-year-old residential system with ice buildup on evaporator coil and suspected refrigerant leak. Upon arrival, confirmed ice formation on indoor coil and low cooling performance; previous technician had added refrigerant without locating leak source. Performed comprehensive leak detection using electronic leak detector and identified active refrigerant leak in evaporator coil assembly. Recovered remaining refrigerant from system per EPA regulations. Recommended evaporator coil replacement due to leak location being non-repairable. Provided detailed estimate for coil replacement, proper refrigerant recharge, system evacuation, and leak verification testing to restore system to manufacturer specifications.
Conducted comprehensive HVAC system replacement estimate at residential property. Evaluated existing outdoor condensing unit positioned on concrete pad adjacent to brick wall, as well as indoor air handler installation with associated ductwork, refrigerant lines, and condensate drainage system. Documented current equipment configuration, spatial constraints, and mechanical room layout to provide homeowner with replacement options and system upgrade recommendations.
Responded to no cooling complaint on 8-9 year old central air conditioning system where blower was operating but air was not cold throughout the residence. Performed diagnostic evaluation of outdoor condensing unit and indoor air handler. Inspected refrigerant lines, electrical connections, and both indoor and outdoor components. System evaluated and necessary repairs identified to restore proper cooling operation.
Responded to callback for water leak dripping from bathroom ceiling. Accessed attic space and inspected HVAC flexible ductwork and insulation. Located source of moisture intrusion affecting bathroom vent system. Documented existing conditions including flexible duct routing, insulation placement, and structural components. Verified ductwork installation and identified areas requiring correction to prevent continued condensation and water damage to ceiling below.
Conducted comprehensive HVAC replacement estimate for non-functional residential system. Evaluated existing American Standard outdoor condensing unit and associated equipment positioned in exterior utility area alongside natural gas meter infrastructure. Assessed site conditions including equipment accessibility, vegetation overgrowth around units, and proper clearances for replacement installation. Documented current system configuration and photographed equipment specifications, manufacturer data plates, and installation environment to develop complete replacement proposal. Homeowner declined repair options and requested replacement estimate only.
Completed full heat pump and air handler system installation. Installed new Honeywell Home digital thermostat, performed refrigerant charging and system diagnostics using manifold gauges to verify proper pressures and system performance, and confirmed all equipment is operating within manufacturer specifications.
Responded to no cooling complaint on central air conditioning system previously installed by our company. Upon arrival, performed diagnostic testing using digital manifold gauge set to measure refrigerant pressures and temperatures. Low side pressure reading of 127.6 and high side pressure reading of 290.1 were recorded, indicating potential refrigerant charge issues or system performance concerns. Conducted visual inspection of outdoor condenser unit, which showed normal operation with no visible ice buildup on coils or refrigerant lines. Unit exterior displayed typical weathering consistent with outdoor installation. All diagnostic readings and equipment conditions were documented with photographs for service records. Homeowner was advised of findings and system status, with notation made regarding extended warranty coverage for any necessary repairs.
Conducted follow-up site visit to address ongoing HVAC system performance concerns. Reset blower motor speeds to factory default settings and performed comprehensive system diagnostics including refrigerant pressure verification, supply and return air temperature measurements, and airflow balance assessment throughout the residence. Inspected and adjusted all zone dampers, closing off kitchen damper due to absence of register causing excessive airflow imbalance to other zones. Identified temperature differential between thermostat location and hallway area attributed to inadequate insulation around attic fan opening, allowing heat infiltration that affects thermostat accuracy and zone comfort. Recommended immediate installation of proper insulation barrier around attic access fan opening to eliminate thermal influence on thermostat readings and improve overall system performance.
Responded to no cooling complaint on 3-year-old Lennox residential system with no airflow and indoor temperature reading 88°F with thermostat set to 79°F. Upon arrival, confirmed complete loss of airflow from supply vents with no breakers tripped. Performed diagnostic inspection of furnace and air handler assembly located in basement utility area. Accessed control board compartment and identified failed blower motor relay on integrated furnace control board preventing blower operation. Tested voltage supply to board confirming proper 24VAC from transformer and 120VAC line voltage present. Verified blower motor capacitor tested within acceptable range and motor windings showed proper resistance values, isolating failure to control board relay contacts. Replaced defective integrated furnace control board, reconnected all low voltage thermostat wiring and line voltage connections to blower motor assembly. Cycled system through complete operational test in cooling mode, confirmed proper bl
