When something goes wrong at home—a leaking pipe, a faulty light switch, or an air conditioner that just can’t keep up, it can throw your whole day off. At A+ Derr Heating, Cooling, Plumbing, & Electrical, we’re more than just service pros, we’re neighbors who understand what it means to keep your home running. Our team provides dependable heating, cooling, plumbing, and electrical services in Mount Vernon backed by real experience, licensed professionals, and a commitment to treating you right, from the first call to the final cleanup. Call our team today at 833-232-4328 or connect with us online for more information.Â
Mount Vernon Plumbing Services for Better Functionality
It might start with a slow drip under the sink or a little water pooling where it shouldn’t—but before you know it, you’re dealing with water damage and rising stress. That’s why our local Mount Vernon plumbers respond quickly, work efficiently, and always treat your home with care. We’re here to fix the problem and make things right—without the mess or the worry.
- Drain Cleaning & Sewer Services: When your sinks or tubs stop draining like they should, we’re there with fast solutions. Our team clears out stubborn clogs and inspects your sewer lines to make sure everything flows the way it should.
- Sump Pump Services: A flooded basement can be a homeowner’s nightmare. We install and maintain reliable sump pumps that keep your lower level dry and protected.
- Water Heater Installation & Repair: Nobody wants to start their morning with an ice-cold shower. Whether it’s a traditional tank or a tankless system, we’ll get your hot water flowing again—fast.
- Garbage Disposal Repair & Replacement: A jammed or broken disposal can bring your kitchen to a halt. We repair or replace units with minimal disruption, so you can get back to your routine.
- Pipe Leak Detection: Not all plumbing problems are visible. We use smart technology to track down leaks inside walls and under floors before they become costly repairs.
- Fixture Installation: Upgrading your bathroom or kitchen? We install faucets, toilets, and other fixtures with care, precision, and an eye for clean design.
- General Plumbing Repairs: Whether it’s a mystery drip, a running toilet, or something bigger, our team handles plumbing issues of every kind—quickly, cleanly, and with no guesswork.
24/7 Emergency Service
(833) 232-4328Â
Complete Air Conditioning Services in Mount Vernon, IN
If you’ve spent a summer in Mount Vernon, you know the heat and humidity aren’t just uncomfortable—they’re relentless. A working air conditioner isn’t a luxury here—it’s survival. That’s why our Mount Vernon cooling services are built for real-world Indiana weather, keeping your home cool, your energy bills low, and your peace of mind intact.
- AC Repair Services: Warm air? Weak airflow? Loud noises? Our repair techs find and fix the problem fast.
- New AC Installation: Whether it’s a replacement or a new build, we install energy-efficient air conditioners that meet your needs and your budget.
- Mini-Split System Installation: No ducts? No problem. These compact units offer zoned comfort with powerful efficiency.
- Seasonal AC Maintenance: Prevent breakdowns, lower your bills, and extend the life of your system with a quick annual tune-up.
Reliable Heating Services for Mount Vernon Homes
Winter in Mount Vernon has a way of creeping in fast—and when it does, there’s no comfort like a warm, cozy home. If your heating system is struggling to keep up or suddenly goes out, we’re the team you can count on. From quick fixes to total system upgrades, our heating services are built to handle Indiana’s toughest cold snaps with comfort and confidence.
- Furnace Installation & Maintenance: When your old furnace is costing you comfort and cash, it’s time for a smart upgrade. We install and maintain systems designed to keep up with unpredictable Indiana winters.
- Boiler Repair & Replacement: Radiator heat has its perks—until your boiler acts up. We repair and install boiler systems in Mount Vernon to ensure even, efficient heating throughout your home.
- Heat Pump Services: Want one system that can do it all? Our heat pumps offer reliable heating in the winter and energy-saving cooling in the summer.
- Geothermal Heating Systems: Tap into stable underground temperatures with geothermal systems that reduce your carbon footprint and your utility bills.
- Emergency Heating Repairs in Mount Vernon: Heating problems don’t follow a schedule. That’s why our team is ready 24/7 to get the heat back on—fast and fuss-free.
Safe Electrical Services in Mount Vernon
From simple switch swaps to full rewires, our licensed electricians are here to make your home safer, smarter, and better powered for everyday life. Whether you’re upgrading for convenience or fixing a frustrating issue, we handle it with expert precision and a neighborly touch.
- Electrical Panel Upgrades: Still relying on an outdated breaker box? We install modern panels that power today’s tech-savvy homes safely and reliably.
- Outlet & Switch Installations: From USB charging ports to sleek smart dimmers, we upgrade your switches and outlets to match how you live today.
- Service Upgrades: Whether you’re adding new appliances or simply need more reliable power, our service upgrades ensure your home’s electrical system can keep up with modern life.
- Equipment Repair: From faulty outlets to flickering lights and worn-out switches, we diagnose and repair aging or damaged electrical components to keep your home safe and running smoothly.
- Light Commercial Services: Have a small business in Mount Vernon? We offer light commercial electrical work—from lighting and outlets to panel upgrades—to help keep your operation efficient, functional, and compliant.
- Whole-Home Surge Protection: One lightning strike or power spike can fry your electronics. Our surge systems shield your entire home from unexpected voltage surges.
- Interior & Exterior Lighting: Brighten your kitchen, highlight your landscaping, or increase nighttime safety with professionally installed lighting that looks as good as it works.
- Backup Generators: When the grid goes down, stay up and running. We install standby generators that kick in automatically and power your essentials.
- EV Charger Installation: Tired of slow charging from a basic outlet? We install fast, reliable EV chargers so you can power up your vehicle right from your driveway.
24/7 Emergency Service
(833) 232-4328Â
Clean Indoor Air Quality Services in Mount Vernon
Temperature is only half the story when it comes to comfort at home. If the air you’re breathing is stale, dusty, or too dry, it can take a toll on your health and energy. That’s why we offer indoor air quality solutions that go beyond basic HVAC—making your home feel fresher, healthier, and easier to live in every day.
- Whole-Home Air Purifiers: Tired of breathing in dust, pollen, and who-knows-what else? Our air purifiers tackle airborne irritants and help you breathe easier in every room.
- Humidity Control Solutions: Whether your home feels dry enough to shock you or muggy enough to match the outdoors, we install humidifiers and dehumidifiers that bring your indoor climate back to balance.
- Duct Cleaning & Sealing: Over time, air ducts can turn into dust highways. We clean them out and seal leaks to boost efficiency, improve air quality, and help your system work smarter—not harder.
- Filter Replacements & Upgrades: Not all air filters are created equal. We help you find the best fit for your system and swap them out to keep air flowing clean and free of allergens.
Book Your HVAC, Plumbing, or Electrical Service in Mount Vernon, IN
Need fast, reliable service for your home systems? A+ Derr Heating, Cooling, Plumbing, & Electrical proudly serves Mount Vernon, IN with high-quality heating, cooling, plumbing, and electrical solutions. Call 833-232-4328 today to schedule your service and experience why local homeowners trust us for peace of mind year-round.
Recent Jobs and Reviews in Mount Vernon, IN
Job Locations and Reviews
Craig U.
Returned for follow-up on ongoing no cooling complaint. Reviewed manufacturer performance specifications and charging tables for unit model CBA25UHE-036 to verify proper airflow CFM and wattage at various blower tap settings against external static pressure readings. Cross-referenced operating pressures and subcooling charge levels per factory documentation to ensure system is operating within manufacturer parameters despite customer's continued cooling concerns.
Mount Vernon, IN 47620
Craig U.
Responded to no cooling call on 9-year-old residential HVAC system. Thermostat displayed "still looking for equipment" error and outdoor condenser fan motor was not operating. Diagnosed communication failure between thermostat and equipment, traced issue to failed condenser fan motor preventing proper system startup and cooling cycle initiation.
Mount Vernon, IN 47620
Cameron N.
Completed comprehensive HVAC replacement estimate for residential property with existing gas furnace and air conditioning system located in mechanical closet. Evaluated current equipment condition, ductwork configuration, gas line accessibility, and exterior condensing unit placement to provide complete system replacement recommendations for both heating and cooling components.
Mount Vernon, IN 47620
Isaac G.
Conducted on-site estimate for replacement of existing 80-gallon electric water heater in basement. Current Lochinvar unit actively leaking and causing basement flooding, requiring urgent replacement. Assessed existing 240-volt electrical service compatibility and plumbing configuration including copper supply lines and drainage setup. Evaluated installation requirements for new 80-gallon electric tank water heater manufactured in America, including necessary shut-off valve replacement. Documented existing plumbing infrastructure, ceiling clearances, and access pathways for equipment removal and installation. Photographed current water heater location, surrounding piping system, and electrical connections to provide comprehensive assessment for replacement options.
Mount Vernon, IN 47620
Nick B.
Completed comprehensive evaluation of 12-year-old residential cooling system experiencing operational failure. Assessed existing air conditioning unit, electrical disconnect, ductwork configuration, and interior air handler installation. Provided detailed replacement estimate for complete HVAC system upgrade, including removal of obsolete equipment, installation of new high-efficiency cooling unit with matching air handler, electrical connections, refrigerant lines, and integration with existing duct system.
Mount Vernon, IN 47620
Shawn M.
Responded to no-cooling call at residential property with aging package unit system. Upon arrival, found outdoor HVAC unit in weathered condition with legacy thermostat controls inside the home. Evaluated system for new homeowner experiencing complete HVAC failure, with both heating and cooling functions non-operational. Performed diagnostic assessment of package unit and thermostat wiring to determine operational status and recommended next steps for restoring climate control functionality to the property.
Mount Vernon, IN 47620
James W.
Completed comprehensive replacement estimate for dual HVAC system consisting of two outdoor condenser units and indoor Tempstar furnace. Both outdoor units showed significant weathering and age-related deterioration on exterior grilles and casings, positioned on concrete pad in exterior patio area. Indoor furnace unit located in basement utility space with existing ductwork configuration assessed for compatibility with replacement equipment.
Mount Vernon, IN 47620
Francis I.
Responded to no-cool complaint on 11-year-old Carrier air conditioning system with inadequate cooling and warm airflow. Upon arrival, found outdoor condenser unit with heavily soiled top grille and significant debris accumulation including leaves, dirt, and organic matter restricting airflow. Condenser coils showed substantial contamination with dirt buildup on metal fins. Vegetation growth observed around unit base indicating lack of recent maintenance. Performed complete system diagnostic including temperature differential measurements, refrigerant pressure checks, and airflow assessment. Confirmed system operational but running inefficiently due to restricted airflow at condenser unit. Thoroughly cleaned condenser coil fins using appropriate coil cleaner and low-pressure water rinse to remove dirt, debris, and biological growth. Cleared all leaf litter and organic material from top grille and surrounding unit perimeter. Removed vegetation growth from base of unit to ensure proper c
Mount Vernon, IN 47620
Luke O.
Responded to no-cooling service call for recently purchased home. Upon arrival, conducted thorough assessment of wall-mounted air handler unit and outdoor condenser unit. Confirmed system was not operational due to incomplete installation by previous owners. Evaluated electrical connections, refrigerant line sets, condensate drainage, and control wiring between indoor and outdoor units. Documented existing equipment configuration including ductwork connections and electrical disconnect. Provided homeowner with detailed assessment of required work to properly connect and commission the HVAC system for operational status.
Mount Vernon, IN 47620
Luke O.
Completed annual Gold Level maintenance on 6-year-old residential HVAC system. Performed comprehensive inspection of outdoor condensing unit, verified proper operation of compressor and fan motor, checked refrigerant levels, cleaned condenser coils, and inspected electrical connections and conduit. All components found operating within normal parameters with no immediate service needs identified.
Mount Vernon, IN 47620
James W.
Conducted site evaluation for new 1.5 ton split system installation at owner-occupied residence with no existing HVAC equipment. Assessed exterior installation location with concrete pad and utility access point marked for outdoor condensing unit placement. Evaluated interior space including large hobby room area to determine optimal air handler positioning and ductwork routing requirements for complete system installation.
Mount Vernon, IN 47620
Luke O.
Completed second annual Platinum Level maintenance on a 7-year-old residential HVAC system. Performed comprehensive inspection and servicing of both indoor furnace unit and outdoor condensing unit. Changed 20x25x5 air filter and conducted full system diagnostics. Inspected furnace installation in mechanical room, verifying proper operation of all components, checking PVC condensate drainage, and examining ductwork connections. Evaluated outdoor condenser unit positioned on gravel pad, confirming adequate airflow through ventilation slats and proper electrical connections. All equipment operating within manufacturer specifications with no deficiencies noted. System ready for continued service. Customer due for renewal.
Mount Vernon, IN 47620
Luke O.
Completed annual Gold Level planned maintenance service on 10-year-old residential HVAC system during second visit of the service period. Performed comprehensive inspection of outdoor condensing unit and indoor furnace system, checking all operational components, electrical connections, and refrigerant levels. Verified proper airflow through 20x25x5 filter media, inspected ductwork connections and plenum assembly, and confirmed all safety controls and PVC condensate drainage lines were functioning correctly. System operating within manufacturer specifications with no deficiencies noted. Customer due for service agreement renewal.
Mount Vernon, IN 47620
Luke O.
Completed routine preventative maintenance on residential Lennox air conditioning system and furnace installation. Performed comprehensive tune-up including inspection of outdoor condenser unit, indoor air handler, furnace components, refrigerant lines, electrical connections, and ductwork system. All equipment found operating within normal parameters; system tested and confirmed ready for continued service.
Mount Vernon, IN 47620
Luke O.
Completed annual Gold Level planned maintenance on a 3-year-old Lennox system with model RP92M34 evaporator coil and CR33-30/36B-F condenser unit. Performed comprehensive inspection of outdoor condensing unit, verified proper operation of compressor and condenser fan, checked refrigerant lines for leaks and proper insulation, and confirmed unit is securely mounted on concrete pad with adequate clearance for airflow. Inspected indoor air handler components, replaced 16x25x5 air filter, and verified all electrical connections and controls are functioning correctly. This represents the second visit of the annual maintenance cycle, and the service agreement is due for renewal.
Mount Vernon, IN 47620
Tyler C.
Responded to install callback for Lennox system with no cooling and outdoor unit failing to start. Diagnosed and resolved issue preventing condenser operation. Verified proper airflow direction on 16x25x4â…œ" filter installed during original setup and confirmed system returned to normal operation with indoor temperature recovering from 81°F to setpoint.
Mount Vernon, IN 47620
Brent D.
Completed annual Platinum Level maintenance on single residential HVAC system. Performed comprehensive inspection of air handler unit, installed new 20x25 air filter, verified proper filter track alignment and housing integrity, and documented system specifications including heating data plate information. All components inspected and photographed for service records, with system operating within normal parameters upon completion.
Mount Vernon, IN 47620
Brent D.
Completed non-seasonal startup procedures on three HVAC systems installed in December 2025. Verified proper operation of ECM motor control boards, checked all electrical connections and terminal blocks for secure wiring, and confirmed control board functionality with all LED indicators operating normally. Inspected wire management, terminal connections on both primary and secondary control boards, and verified proper voltage to all system components. All three systems tested and operating within manufacturer specifications.
Mount Vernon, IN 47620
James W.
Conducted comprehensive assessment of aging 3-ton HVAC system in 3500 sq ft residence built into ground on three sides. Evaluated existing upflow furnace configuration, documented current system dimensions and plenum specifications, photographed mechanical thermostat and system layout schematic for replacement planning. Provided equipment sizing recommendations and replacement pricing options based on unique installation requirements and home's earth-sheltered construction characteristics.
Mount Vernon, IN 47620
Tyler C.
Completed annual Gold Level maintenance on mini-split system installed in March 2020. Inspected electrical connections at terminal block, verified proper wire terminations, and checked evaporator coil cleanliness and fin condition using level to confirm proper unit positioning. All components operating within normal parameters with no deficiencies noted during this first annual service visit.
Mount Vernon, IN 47620
