Reliable Heating & Boiler Services in Hermon & Greater Penobscot County
Keeping local families and businesses warm through every Maine winter. Professional installation, tune-ups and all of your oil and propane needs.
Locally Owned & Operated in Hermon
Your neighbors, not a call center.
Licensed & Insured Maine Technicians
Trained, certified, and background-checked.
FAST RESPONSE
Real people answer.
38+ Years Serving Central Maine
Decades of trusted local service.
Core Heating Services
From emergency repairs to high-efficiency upgrades, we keep Maine homes and businesses warm all winter.
Boiler & Furnace Repair
Fast, accurate diagnostics and repair for boilers, furnaces, and hydronic systems of every make and model — done right the first time.
Request ServiceAnnual Heating Maintenance & Tune-ups
Keep your system efficient and reliable with seasonal tune-ups that lower fuel bills and catch problems before the cold hits.
Request ServiceHeat Pump & High-Efficiency Systems
Modern heat pumps and high-efficiency upgrades that cut energy costs and keep your home comfortable year-round in Maine's climate.
Request ServicePROPANE AND OIL
From single-family homes to commercial buildings, we size, install, and service heating systems built for Maine winters.
Request ServiceWhy Choose Black Diamond Heating
We're not a big-box chain or a call center. We're your neighbors — the local crew that shows up, does honest work, and stands behind it. When the temperature drops in Penobscot County, we're the name families have trusted for four decades.
Deep Local Roots
Born and based in Hermon, we've kept our neighbors warm for over 38 years. We know Maine homes, Maine weather, and Maine people.
Transparent Local Pricing
Straightforward quotes with no surprise fees. You'll know the cost before we start — honest work at a fair price, every time.
Dependable Emergency Response
When freezing weather hits, real local technicians answer the phone not a dispatch queue in another state.
What Our Neighbors Say
Real reviews from real Maine families who trusted Black Diamond to keep them warm.
"Our furnace died on the coldest night of January and Black Diamond had a tech at our door within two hours. Friendly, honest, and back up and running before morning. Lifesavers."
"Called four companies for a boiler quote — only Black Diamond showed up on time and gave me a straight price with no surprises. Did the install clean and fast. Highly recommend."
"They've serviced our heating system for years. Always on time, always explain what they're doing, and never try to sell me something I don't need. True local pros."
Proudly Serving Penobscot County
Based in Hermon, we reach homes and businesses across Greater Penobscot County and the surrounding communities.
Not sure if we cover you?
Give us a call — if you're in or around Penobscot County, we'll get a technician out to you.
Call (207) 848-5099