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.
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.
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
Mount Vernon, IN at a glance
A+ Derr Heating & Cooling has completed 15 jobs in Mount Vernon, IN between December 2025 and January 2026.
The most recent job was on January 30, 2026.
Job Locations and Reviews
Responded to callback following previous PM where humidifier flap was incorrectly positioned. Performed diagnostic testing on system with multimeter to verify electrical connections and operation of humidity control components. Adjusted humidifier settings and verified proper orientation of water panel and damper assembly to address the low humidity level (21%). System should now maintain appropriate humidity levels as requested by customer.
Conducted a replacement estimate for an aging HVAC system with visible exterior unit snow accumulation and deterioration. Inspected existing thermostat wiring configuration, noting multiple connections including Y, Y2, G, C, O/B, AUX, E, W, and R terminals with properly stripped wires. Exterior assessment revealed snow-covered heat pump/AC unit mounted against home's siding with existing electrical disconnect that will require replacement during system upgrade.
Conducted site assessment for mini-split installation in upstairs area per customer request. Evaluated electrical service panel (HomeLine LOAD CENTER CAT. NO.: HOM4-12L100) to determine compatibility with proposed system. Inspected potential indoor unit location in bedroom with adequate wall space and proper clearance for optimal airflow and efficiency.
Performed annual maintenance on 2-year-old Platinum Level HVAC system with 20x20x5 filter during first service visit. Inspected blower motor assembly which showed dust accumulation requiring cleaning. Conducted electrical diagnostic testing on control board and capacitor, verifying proper connections and component functionality in both indoor air handler and outdoor condensing unit.
Completed annual Platinum Level maintenance on 3-year-old HVAC system in residential utility area. Replaced 20x25x5 air filter, inspected furnace components, ductwork, and ventilation system which were found to be in proper working condition. Customer renewed service agreement for continued maintenance coverage.
Completed second visit of Platinum Level maintenance on residential HVAC system. Serviced 20x25x5 air filter as scheduled per annual maintenance plan. System and connections were inspected and found to be in proper working condition with no issues identified.
Completed site assessment for mini-split installation in client's pole barn. Surveyed unfinished space featuring concrete flooring, metal ceiling, and partial wood framing. Inspected existing electrical panel to evaluate capacity for supporting new HVAC system. Client discovered our services through Google and is seeking options for climate control in their outbuilding.
Successfully installed a 3-ton 19 SEER Lennox heat pump system in Mount Vernon, including outdoor condenser unit positioned on concrete pad with proper clearances and air handler in the basement utility room adjacent to existing water heater. All ductwork connections were properly sealed with metallic tape and system was tested for normal operation after installation.
Performed second annual Platinum Level maintenance visit on 5-year-old HVAC system. Replaced 16x25x5 filter and inspected Honeywell thermostat and Amana outdoor unit. System functioning properly with no issues identified. Customer due for service renewal.
Conducted annual Gold Level maintenance on garage mini-split system installed 6/27/25. Performed comprehensive inspection including evaluation of condensation drainage and verification of proper system operation. Unit was found to be functioning correctly with temperature reading at 51 degrees as shown on display panel.
Performed replacement estimate for a homeowner with an aging 3-ton heat pump system that's "limping along" but still operational. Customer already received a quote for a 16 SEER heat pump replacement ($8,850) and requested a second opinion. Current Goodman outdoor unit sits on concrete pad with proper connections to house; customer plans to sell property within the next year and is not interested in repair options.
Completed monthly maintenance on 6-year-old HVAC system, including replacement of 16x25x5 air filter. Inspected water heater, expansion tank, and PVC piping connections in mechanical room, confirming all components are functioning properly with no signs of leaks or damage. Documentation photos taken of system components for service record.
Performed follow-up site visit as scheduled per Jeremy to address previously incomplete work. Inspected and documented the inducer motor issue, taking photographic evidence of the electrical connector components for assessment and proper installation.
Performed scheduled maintenance on customer's humidifier system, which included cleaning and replacement of the humidifier filter according to manufacturer specifications. Upon inspection of the furnace and water heater installation, all components were found to be functioning within normal parameters. The humidifier is now operating at optimal efficiency to maintain proper indoor air quality levels.
Performed annual planned maintenance on HVAC system installed in March 2021. Inspected and verified thermostat functionality, including system settings and equipment communication parameters. Confirmed proper operation of heat pump settings, including compressor cycle timing (180 sec) and defrost termination temperature (70°F). Airflow output measured at 800 CFM. 20x20x5 filters replaced as part of routine service.
