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 ↗
Highlights
- Geothermal systems — about 25 designed and installed since 1992, per fosters.com
- Long history — company self-reports 112 years in business
W.H. Demmons is a Portland mechanical contractor whose own list of expertise reads like a building engineer's: improved air quality, process cooling, archival storage, clean and dry rooms, manufacturing, auditoriums and meeting halls, marijuana grow rooms and geothermal systems. The company self-reports 112 years in business. Geothermal is the thread a fosters.com article picks up: it quotes Douglas Martin, president of W.H. Demmons Inc. of Portland, saying the company had designed and installed about 25 geothermal systems since 1992. Its Procore Construction Network profile lists HVAC, plumbing and roofing and shows 20 projects. A Better Business Bureau profile with an A+ grade describes Demmons Roofing, Inc., a commercial roofing company incorporated in Maine in 1987, with Douglas Martin as president.
Heard around town
News & the web
- Maine regulation of geothermal energy questioned
“Douglas Martin, president of W.H. Demmons Inc. of Portland, which has designed and installed about 25 geothermal systems since 1992, said he welcomes DEP's interest in improving oversight.”
— fosters.comRead the article ↗ - Historic preservation completed for a midcoast music school’s permanent home
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— mainebiz.bizRead the article ↗
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 W.H. Demmons. 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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