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Verified record
License not state-verified. We could not confirm a current registration in the state registry. Insurance is self-reported. Look up in the official Maine registry ↗
- Not rated by the BBB
- 1 work photo
Highlights
- A same-day furnace fix — a 2021 customer said Dave fixed it with truck parts
- A split install — a 2025 customer had Dave install a split
- On-time business — a 2021 customer called it well run and on time
A 2021 customer said Dave did the original installation of their furnace and a/c when they built their home 11 years earlier. That 2021 customer said the furnace would start and then shut down, Dave was there the same day, and he fixed the problem with parts he had in his truck, with only one visit needed. A 2025 customer said Dave put in their original system five years earlier and had just installed a split for them. That 2025 customer also said Sandra was very helpful. A 2021 customer called it a well-run, on-time business and said they never felt taken advantage of.
Heard around town
News & the web
- Triple Threat: 3 Design Teams Remodel a Stunning Lakeside Home
“Donnelly’s HVAC”
— mainehomedesign.comRead the article ↗
Read the comments
Most recent comments
- 5.0Jul 30, 2025
Dave put in my original system 5 years ago, and he did an excellent job. Any maintenance issues he has gone above and beyond. He is extremely knowledgeable and professional. I just had him install a split, and once again, he and his team did not disappoint. Sandra is wonderful and very helpful as well. Highly recommend!
— Tammy ProctorView on Google Reviews ↗ - 5.0Nov 16, 2021
Well run and on time business, never felt like I was being taken advantage of. Dave certainly knows his job and his help was also excellent. Highly recommend them! Thanks, Dennis Hourihan
— Dennis HourihanView on Google Reviews ↗ - 5.0Oct 6, 2021
Dave did original installation of our furnace and a/c when we built our home 11 years ago. System has worked flawlessly all this time. This heating season furnace would start then shut down. Called for service and he was there same day. Fixed the problem with parts he had in his truck ( no downtime waiting for parts and only 1 visit needed) and system is working perfectly now. Sandra in the office was a pleasure to work with also. Highly recommended.
— Steve LView on Google Reviews ↗
What does heating and cooling work cost in Greater Portland?
Typical your area range for this kind of work, from regional averages — not a quote from Donnelly's HVAC. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$5,000 – $11,400
Typical HVAC project around $8,200
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