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
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.
Recent Jobs and Reviews in Princeton, IN
Job Locations and Reviews
Completed second maintenance visit of Gold Level agreement on 7-year-old HVAC system. Inspected furnace system, connections, and ductwork in basement mechanical room. Noted 16x25x5 filter replacement and confirmed annual renewal is due. Left voicemail for customer regarding scheduling next maintenance appointment.
Performed inspection of shower plumbing leak reported in crawl space. Identified severely corroded galvanized pipe with significant rust damage at connection point to PVC. Documented evidence of water intrusion through wooden structural elements for real estate disclosure purposes.
Performed annual planned maintenance on HVAC system installed 7/31/25. Inspected thermostat low voltage connections and verified proper wire terminations. Temperature readings confirmed system operating at 78°F with all components functioning within normal parameters.
Successfully installed a Navien NPE-180A tankless water heater on a wooden wall with proper ventilation through PVC and metallic ducting. Installation included connecting copper, PVC, and drainage pipes to the unit and integrating it with an existing blue water filtration system in the utility room.
Completed first annual maintenance visit on Gold Level service plan for an 8-year-old HVAC system. Inspected electrical connections in control panel, checked wiring integrity, and examined blower motor assembly. Replaced 16x20x1 air filter and documented system condition with photos of internal components for service records. Next scheduled maintenance due 9/2025.
Responded to service call for a 5-year-old heat pump system that was reported to be shaking violently and producing excessive noise during operation. Upon inspection, found the outdoor condenser unit had accumulated debris in the fan assembly. Shut down the heat pump, cleaned the fan components, and verified proper operation after service. Customer had been relying on auxiliary heat strips while the heat pump was disabled.
Responded to service call for Lennox system displaying "Urgent service message" on thermostat. Diagnostic inspection revealed Indoor Fan Motor Failure alerts recorded on January 8, 2024, and December 31, 2023, though system was currently operating normally. Inspected and replaced air filter which showed signs of extended use, cleared error codes from thermostat, and verified proper system operation before concluding service.
Successfully completed installation of a complete GREEN 3-ton 17 SEER/9.7 HSPF two-stage HVAC system with both heating and cooling capabilities. Performed electronic circuit board connections and conducted pressure testing with dual port manometer, confirming proper system operation with readings at 004/100.
Successfully installed a comprehensive whole-house water filtration system consisting of dual black cylindrical filter housings with white bracket supports securely mounted to the wall structure. Connected the system to existing copper plumbing infrastructure using brass fittings and valves, ensuring proper integration with the home's water supply network including PEX connections where appropriate.
Responded to follow-up service call regarding temperature regulation issues reported after previous maintenance visit. Upon inspection, found Honeywell Home ProSeries thermostat functioning properly, displaying 73°F while set to 67°F in Heat mode. Verified system operation and confirmed thermostat is now properly maintaining desired temperature parameters.
Performed gold level annual maintenance on 1 HVAC system. Discovered significant dust accumulation on blower wheel assembly affecting system efficiency; thoroughly cleaned blower components to restore proper airflow and operation. System is showing signs of age with minor rust development on housing components.
Performed annual planned maintenance on HVAC system installed in November 2025. Conducted electrical diagnostics with multimeter, confirming proper voltage readings of 24.56V at control board. Inspected blower assembly, fan motor, and ductwork connections. System is operating within normal parameters with all safety systems functioning correctly.
Completed Gold Level maintenance on 5-year-old HVAC system. Inspected internal components including electrical wiring, gas valve assembly, circuit boards, and blower motor; cleaned system interior and verified proper operation. Replaced 16x25x5 filter and documented system condition with photos for future reference.
Responded to water leak report in utility room from a 6-year-old HVAC system. Upon inspection, identified a broken pipe on the furnace that had caused significant water release but had mostly stopped leaking at time of arrival. Documented the condition of the drainage pan showing sediment buildup and assessed potential water damage to the surrounding plywood flooring.
Performed annual Gold Level maintenance on 20-year-old Kenmore HVAC system. Inspected electrical connections and wiring (red, green, black, yellow, orange, and purple) for proper functionality. Replaced 16x24x1 filter and verified system operation; unit is functioning adequately despite age.
Completed assessment for replacement of aging exterior HVAC condenser unit. Documented current installation on gravel bed adjacent to structure with green siding, noting electrical connections and surrounding conditions. Turned quote over to management for customer consideration.
Diagnosed and repaired water heater system that was failing to provide adequate hot water throughout residence. Discovered significant sediment buildup in tank and malfunctioning dip tube, which were preventing proper heating and distribution. Performed complete flush of system, replaced dip tube and expansion tank, and verified proper operation with consistent hot water delivery to all fixtures.
Conducted on-site assessment for installation of water filtration or water softener system. Inspected existing water heater setup and surrounding utility area, documenting current plumbing configuration including copper and PVC lines with shutoff valves. Provided customer with comprehensive options for water treatment solutions based on observed installation environment.
Completed Platinum Level maintenance on 3-year-old HVAC system, which included replacing 16x25x5 filter and performing comprehensive system inspection. Verified proper operation of Lennox thermostat and confirmed heating functionality. Outdoor unit was properly protected with weatherproof cover as part of seasonal maintenance protocol.
Performed scheduled second visit of Gold Level maintenance on 1-year-old Lennox HVAC system. Inspected furnace unit in basement utility area, changed 20x20x5 air filter, and verified proper operation of all components. System functioning within normal parameters; customer advised of upcoming renewal.
