HVAC Company, Plumber & Electrician in King of Prussia, PA

Since 1972, Donnelly’s Plumbing, Cooling, Heating & Electric has proudly served homeowners in King of Prussia, PA, with trusted, family-owned expertise. From plumbing leaks to HVAC maintenance and electrical upgrades, our licensed and background-checked technicians provide dependable, same-day service to keep your home running safely and efficiently. With upfront pricing, free estimates, and over 50 years of experience, Donnelly’s is your local one-stop shop for complete home comfort — always focused on honesty, quality, and customer care.

If you need assistance with your HVAC, electrical or plumbing system, contact the pros at Donnelly’s today.

Our Plumbing Services

Our licensed and insured plumbing professionals have extensive knowledge in installing, repairing, and maintaining your plumbing system. Turn to us for assistance with:

• Plumbing repairs
• Drain cleaning
• Water heaters
• Leak detection and repair
• Pipes
• Faucets and sinks
• Frozen pipes
• Gas lines
• Toilets
• Garbage disposals
• Sump pumps
• Tree root infiltration
• Water softeners
• Whole-home water filtration
• And much more!

What to Do if You Encounter a Plumbing Leak

If you encounter a plumbing leak in your home, turn off your water supply line to that area of piping. Most vanities and sinks have water shut-off valves right under the sink. If you can’t locate a shut-off valve near the site of the leak, then shut off your main water supply valve. This will prevent future water leakage until one of our plumbers can repair the leak for you.

It’s necessary to get repair service promptly, as water can end up causing extensive damage to your home in a short amount of time. Not all plumbing leaks are obvious. Hidden leaks can be identified by higher-than-normal water bills, wet drywall, and yellow water stains.

Air Conditioning Services

When the summer heat arrives in King of Prussia, it can be unpleasant. Fortunately, a well-functioning home air conditioning system can be all you need to stay safe and comfortable. It will also remove excess indoor humidity to keep your belongings safe from warping and mold growth. Our team offers comprehensive AC services, including:

• AC installation and replacement
• AC repair
• AC maintenance

Our HVAC technicians can assist with your ductless mini-split AC systems and suggest products that can help enhance your indoor air quality. With our help, you can rest assured that your family is breathing in safe air while relaxing at home.

Heating Services

When cold winter weather hits, you’ll spend more time indoors. Having a reliable heating system that functions optimally will help ensure that your household stays warm and your heating bills stay affordable. Look to us for:

• Heating installation and replacement
• Heating repair
• Heating maintenance

We service all heating systems, including boilers, furnaces, and heat pumps.

Electrical Services in King of Prussia, PA

Your home’s electrical system powers everything from heating and cooling to lighting, cooking, and entertainment — making safety and reliability essential. At Donnelly’s Plumbing, Cooling, Heating & Electric, we offer expert electrical services tailored to the needs of King of Prussia homeowners. Whether you’re living in a newer development or updating an older home, our certified electricians handle every project with precision and care.

Our Electrical Services Include:

• Electrical Repairs: Quick, professional solutions for flickering lights, faulty switches, and circuit breaker issues.

• Panel Upgrades & Replacements: Upgrade your electrical panel for improved safety and support for modern energy demands.

• Lighting & Fixture Installations: Brighten and enhance your home with energy-efficient lighting and professional installation.

• EV Charger Installation: Get your home EV-ready with safe, code-compliant charger setups.

• Whole-Home Surge Protection: Protect your electronics, HVAC system, and appliances from unexpected surges.

• Generator Installation & Maintenance: Ensure peace of mind during outages with reliable whole-home generator solutions.

Choose Us for Plumbing, Electrical & HVAC Services in King of Prussia

Your home’s plumbing, electrical, and HVAC systems are some of its most important components. To ensure they remain in tiptop shape and receive quick repair service when you experience an issue, you need to have a reliable professional you can trust.

Donnelly’s Plumbing, Cooling, Heating & Electric is a dependable and professional company with background-checked technicians who can service all different brands of systems. We also offer emergency repair services and discounts for veterans, seniors, and military members.

Contact us online now to schedule HVAC, electrical or plumbing services in King of Prussia, Pennsylvania.