Princeton, IN Home Service Experts for HVAC, Plumbing & Electrical - A+ Derr Heating & Cooling
24/7 Emergency Service

HVAC emergencies happen when you least expect them. Contact the professionals at A+ Derr to take care of your issue. We have the necessary skills and tools to fix your system so you can safely use it once again. Call our team at 833-232-4328 to get emergency HVAC services in Louisville, KY, Evansville, IN, or the surrounding areas.

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Princeton, IN Home Service Experts for HVAC, Plumbing & Electrical

Brand new AC condenser unit in front of wooden fence

Life at home runs on comfort, until something breaks. One minute everything’s working, and the next, your furnace is making strange noises, your outlets won’t cooperate, or your water heater decides to quit right before a busy Monday morning. At A+ Derr Heating, Cooling, Plumbing, & Electrical, we’re not just here for emergencies, we’re here to make things feel right again. Proudly serving Southern IN, we offer HVAC, plumbing, and electrical services with a personal, down-to-earth approach. Whether it’s a small fix or a major upgrade, call A+ Derr at 833-232-4328 or contact us online to get started, 

Reliable Plumbing Solutions for Princeton Homes

Water is essential—but plumbing issues can be a serious headache. From subtle leaks to sudden backups, we take care of it all so you can get back to normal.

  • Sewer Line & Drain Cleaning: If your sinks or tubs are draining slowly—or not at all—we clear the mess and inspect your lines to prevent future surprises.
  • Leak Detection You Can Trust: That mystery puddle? We’ll trace it, fix it, and help stop hidden leaks from driving up your water bill or damaging your home.
  • Hot Water Issues Solved: No more cold showers. We repair and replace both traditional and tankless water heaters, ensuring you’ve got reliable hot water when you need it.
  • Plumbing Upgrades: Whether you’re swapping out a leaky faucet or renovating the whole bathroom, our team installs everything from toilets to tubs.
  • Sump Pump Installation: Protect your basement from heavy rains and rising water with a dependable sump pump, installed and maintained by our pros.

Princeton Heating Services You Can Trust

If you’ve lived through a Princeton winter, you know how fast a sunny day can turn into a freezing night. That’s why your heating system needs to be dependable—and why we’re here when it’s not. Whether your furnace starts making weird noises, your boiler won’t kick in, or you’re just not getting the warmth you expect, our heating team shows up ready to get your comfort back on track—without the stress.

  • Furnace Repair & Installation: If your furnace is rattling, blowing lukewarm air, or refusing to start, we’ll track down the problem and fix it—or set you up with a new, high-efficiency unit that heats reliably and saves on bills.
  • Boiler Repairs & Radiant Heat Help: Radiant heat systems are efficient and cozy, but they need the right care. Whether it’s an old boiler or a finicky pump, we’ll keep your system running quietly and consistently.
  • Heat Pump Services: Looking for year-round comfort? Heat pumps offer both heating and cooling in one unit, and our team installs and services them to run at peak efficiency in all seasons.
  • Geothermal Heating Systems: Want to go green and save big over time? Our geothermal solutions tap into stable ground temps to heat your home sustainably—great for long-term value and the environment.
  • 24/7 Emergency Heating Repair: Heating issues don’t wait until business hours. That’s why we offer round-the-clock emergency support—so you’re never left in the cold.

Stay Cool with AC Services in Princeton

When your air conditioner struggles to keep up, it doesn’t just affect your comfort—it makes the whole house feel off. Cooking becomes unbearable, sleep is impossible, and even sitting still is sticky business. That’s when you call A+ Derr. We show up ready to tackle the issue head-on, whether it’s a minor fix or a full system replacement, so you can get back to cool, quiet evenings and comfortable mornings.

AC Repair

Whether it’s a refrigerant issue, a faulty motor, or just not cooling like it used to, we diagnose and fix air conditioning problems fast—so you don’t have to sweat it out.

AC Installation & Replacement

If your current system struggles every summer or is costing you a fortune on energy, we’ll help you choose and install a more efficient model that fits your space and comfort needs.

Ductless Mini-Split Systems

Don’t have ducts? No problem. Ductless mini-splits offer zoned comfort with sleek, efficient design—perfect for converted attics, additions, and more.

Preventive AC Maintenance

Don’t wait until your system fails on a hot day. We offer seasonal maintenance that keeps your AC running longer, stronger, and more efficiently year after year.

Princeton Electrical Services That Power Your Day

Electrical Repair in Lexington

Nearly everything in your home—from your fridge to your phone charger—runs on electricity, and when something goes wrong, it doesn’t just disrupt your day, it slows down your entire routine. Whether your lights are flickering, your panel’s overloaded, or you’re looking to bring your home into the 21st century with smart features or EV charging, we’ve got the expertise to make it all work safely and smoothly. Our job is to help you power your life with confidence.

  • Electrical Panel Upgrades: If your panel trips every time you run the microwave and dryer at the same time, it’s probably time for an upgrade.
  • Outlet & Switch Installations: Need USB ports or smart switches? We make it easy to modernize your outlets with clean, professional installs.
  • EV Charger Installation: We install Level 2 chargers in Princeton so you can power up your electric vehicle quickly and conveniently from home.
  • Whole-Home Surge Protection: Don’t wait until after the damage is done. We install whole-house protection to safeguard your devices and appliances.
  • Service Upgrades: Still relying on an outdated electrical system? We upgrade service panels and wiring to handle today’s tech-savvy lifestyles—so your power keeps up with your pace.
  • Equipment Repair: Got flickering lights, dead outlets, or a circuit that keeps tripping? Our team tracks down and repairs electrical issues before they become hazards.
  • Light Commercial Services: Run a small business in Princeton? We provide commercial-grade electrical solutions that keep your shop, office, or workspace powered and compliant—without cutting corners.
  • Backup Generator Systems: Stay safe and connected during power outages with a professionally installed standby generator.
  • Lighting That Works for You: From under-cabinet kitchen lights to motion-sensor outdoor lighting, we’ll help you design and install the lighting you need.

Indoor Air Quality Solutions for Cleaner, Healthier Princeton Homes

Your HVAC might be heating and cooling your home, but what about the air itself? If it’s dusty, dry, or stuffy, we’ve got solutions that go beyond temperature.

  • Whole-Home Air Purifiers: Trap allergens, pet dander, and airborne bacteria to create a fresher living space.
  • Humidity Control: Keep air from feeling too dry in the winter or too sticky in the summer with the right balance of moisture.
  • Duct Cleaning & Sealing: Clear out built-up debris and seal air leaks to improve airflow, reduce allergens, and boost energy efficiency.
  • Filter Upgrades: A better filter means cleaner air and a longer-lasting HVAC system—we’ll help you pick the right one.

Get It Done Right—Call A+ Derr in Princeton Today

Whether it’s your first call or your fifteenth, we’re here when you need a hand. A+ Derr Heating, Cooling, Plumbing, & Electrical offers honest, hardworking service for plumbing, HVAC, and electrical repairs and upgrades in Princeton, IN. Call us at 833-232-4328 or contact us online for more information.

 

What To Expect

Discover The A+ Derr Difference

24/7 Heating & Cooling Repairs​

Heating and cooling emergencies can happen on nights, weekends, and holidays, so you can trust us to be there no matter when you need us.

Licensed & Experienced Technicians​

Our experts have the expertise and training to deliver the highest quality services every time.

100% Satisfaction Guarantee​

Our team is dedicated to ensuring your 100% satisfaction with every HVAC service we perform.

Servicing All Major Makes & Models Of Equipment

We are a Lennox Premier Dealer and also service on all makes and models of equipment, including Goodman, Amana, Carrier, Trane, Rheem & more!

Locally Owned & Operated​

Since we’re based in Kentuckiana, we know the needs of Evansville, Louisville, and surrounding communities.

50+ Years in Business​

For over 50 years, A+ Derr has provided high-quality service, products, and results for Kentuckiana's residents.

24/7 Heating & Cooling Repairs​

Heating and cooling emergencies can happen on nights, weekends, and holidays, so you can trust us to be there no matter when you need us.

Licensed & Experienced Technicians​

Our experts have the expertise and training to deliver the highest quality services every time.

100% Satisfaction Guarantee​

Our team is dedicated to ensuring your 100% satisfaction with every HVAC service we perform.

Servicing All Major Makes & Models Of Equipment

We are a Lennox Premier Dealer and also service on all makes and models of equipment, including Goodman, Amana, Carrier, Trane, Rheem & more!

Locally Owned & Operated​

Since we’re based in Kentuckiana, we know the needs of Evansville, Louisville, and surrounding communities.

50+ Years in Business​

For over 50 years, A+ Derr has provided high-quality service, products, and results for Kentuckiana's residents.

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Our Reviews

See What Your Neighbors Are Saying

Jake came and did my spring service yesterday. Their service is very professional, they are always out to get the best deals for anything I may need. I purchased new units from them a couple years ago, and the savings has been so noticeable.

Amanda A.

Amanda A.

Texal and his crew came out on time. Had 2 new systems put in. The service was great. Highly recommend.

Beverly G.

Beverly G.

Nicholas has always been so polite and professional. We feel very comfortable having him in our home and know that his inspections are thorough.

Vicki L.

Vicki L.

Awesome service. They make it easy and painless to keep our new HVAC up and running at top efficiency!

Hal B.

Hal B.

Dylan came today for our tune up and as usual, we are very pleased with our service.

Haley B.

Haley B.