certified company
Based on 268 reviews
Our Certification Process
Best Pick Guarantee
Verified License(s)
Verified General Liability Ins.
Verified Workers' Comp
5th year as a Best Pick Call
"If your heat goes out in the dead of winter or your air goes out on the hottest day of summer, you can't wait forever for relief. Your family's comfort is our top priority, so we commit to providing service within hours, not days. Get professional service from people who care with Donnelly's, where we believe your home is your refuge."

Marty Donnelly | President
Company Information
Services Offered
Donnelly's maintains, installs, and repairs all brands of gas furnaces and gas boilers, central air conditioning units, heat pumps, humidifiers, and whole-house filtration systems. The company also provides free estimates for HVAC replacements.
Donnelly's offers a 100 percent satisfaction guarantee.
Company History
The company is a second-generation, veteran-owned business with over 45 years of experience.
Donnelly's is a member of the Plumbing-Heating-Cooling Contractors Association, the Air Conditioning Contractors Association, and the Nexstar Network.
Employee Information
Donnelly's employees must pass background checks and drug testing. Field staff wear uniforms with name badges and drive vehicles clearly marked with the Donnelly's logo.
Areas Served
Montgomery County, The Main Line, Bucks County
A selection of 268 homeowner reviews:
“I thought Donnelly's was wonderful. They replaced an air conditioner in my house. It was a very positive experience. Their guys were in and out in one day, and they took extra precaution to make sure they didn't drag dirt all over the house. They kept my house very clean, which I really appreciated. They were excellent. I'd give them an A. Those guys were great.”
“We used Donnelly's to service the HVAC unit. They showed up on time, and they were really informative. They told us what caused the problem and how to prevent it from happening. It was excellent.”
“I've been quite happy with them. They replaced the HVAC system and the water heater, and they do general maintenance. They show up when they're supposed to, and they do a good job. I'd give them an A+.”
“It was excellent with no complaints. They did HVAC work.”
“Our air conditioning had a problem. They were professional and clean. They explained what they had to do and why. It's sort of a work in progress. We need to revisit it in a few months. I'd give them an A overall. Their customer service was very good.”
“They installed a heater and an air conditioner. I'd give them an A for the total experience. I've used them before so I would recommend them since this is not the first time they've worked for me.”
“It was an OK experience.”
“I had no complaints and I'd recommend them.”
“I don't have a bad memory of them.”
“I'd rate Donnelly's as an A. My heater still works, so I guess I'm all right. Everything was good. We had a problem, and we had no heat. I chose them because I'd used them before; this was my third time. They fixed it, and everything went fine.”