Family-owned since 1978 · Greater Portland
The most trusted name in home comfort.
Heating, cooling, and clean air — installed and serviced by NATE-certified technicians who treat your home like their own. Upfront pricing, guaranteed work, and real people on call 24/7.
Why Hearthstone
The comfort company your neighbors recommend.
Four decades of doing right by our customers — and it shows in everything we do.
NATE-certified technicians
Every tech is background-checked, drug-tested, and factory-trained on the systems we install.
Upfront, flat-rate pricing
You approve the price before we start. No surprises, no overtime charges — even nights and weekends.
100% satisfaction guarantee
If you’re not comfortable, we’re not done. Repairs and installs are backed in writing.
Licensed, bonded & insured
Fully licensed Maine HVAC contractor with manufacturer warranties on parts and labor.
Financing available
A new system shouldn’t break the bank.
Comfort now, pay over time. Qualified homeowners can finance a new furnace, AC, or heat pump with flexible, low monthly payments — and approval takes minutes.
Subject to credit approval. Terms and conditions apply. Ask us for full details.
Comfort Club membership
Protect your system year-round.
Members get priority service, seasonal tune-ups, and exclusive savings — so small problems never become big, expensive ones.
Comfort Basic
One annual tune-up + priority scheduling.
- 1 precision tune-up per year
- Priority scheduling
- 10% off repairs
- No overtime fees
Comfort Plus
Heating + cooling tune-ups and deeper savings.
- 1 precision tune-up per year
- Priority scheduling
- 10% off repairs
- No overtime fees
Total Care
Whole-home coverage with the best protection.
- 1 precision tune-up per year
- Priority scheduling
- 10% off repairs
- No overtime fees
We install and service every major brand
Reviews
Rated 4.9 stars by your neighbors.
Trusted on Google and rated A+ by the Better Business Bureau.
Our furnace died at 11pm in January and Hearthstone had a tech at our door within the hour. Honest, kind, and the price was exactly what they quoted.
Katherine D.Falmouth, ME They installed a heat pump system that cut our winter heating bill by a third. The crew was tidy, on time, and walked us through everything.
Marcus R.South Portland, ME Been on their maintenance plan for six years. Same friendly techs, never an upsell, always fair. The company my parents trusted and now we do too.
Linda P.Cape Elizabeth, ME Good to know
Answers to common comfort questions.
Seasonal offer
$89 furnace tune-up — book before the cold hits.
A 21-point precision tune-up keeps your heat running safely and efficiently all winter. New customers welcome.
Mention code: HEARTH89Offer valid through Nov 30. Cannot be combined with other offers.
Ready for comfort you can count on?
Schedule online in under a minute, or call our team 24/7. We’ll make it right — guaranteed.