Comfort you feel.
Efficiency you see.
Premium heat pumps, AC, and heating for New England homes — designed for efficiency and installed to last. Free in-home estimates. Same-week installs.
- 25+ yrs
- Experience
- 24/7
- Service
- 5.0★
- Google reviewed
Whole-home comfort, engineered for New England
From cold-climate heat pumps to modern central AC — every system sized, installed, and commissioned by our own team.
Heat Pumps
Cold-climate systems that heat down to -15°F and cool all summer.
Learn moreCentral Air Conditioning
Whisper-quiet, high-SEER systems designed for older Boston homes.
Learn moreDuctless Mini-Splits
Room-by-room control — perfect for additions, condos & finished attics.
Learn moreHigh-Efficiency Furnaces
96%+ AFUE gas furnaces with variable-speed comfort.
Learn moreBoilers
Modern condensing boilers for hydronic and radiant heat.
Learn moreMaintenance Plans
Diamond Membership tune-ups that keep systems running at peak efficiency.
Learn more
Built for the way New Englanders actually live.
We're a start-up with 20+ years of field experience — and we built Black Diamond because homeowners deserve HVAC that's transparent, efficient, and premium from the first phone call.
Energy-first, not repair-first
We design systems that pay you back on every bill — not just patch what's broken.
Our own W-2 technicians
No subcontractors. Every install is done by trained, background-checked Black Diamond crews.
Energy-efficiency focused
We size and commission every system for maximum efficiency — lower bills, longer equipment life.
Lifetime install warranty
If we installed it, we stand behind the workmanship for as long as you own the home.
Rated 5.0 on Google by Massachusetts homeowners.
Every review below comes from our verified Google Business Profile.
"Joe walked us through where every ductless head should go in our older home and why — and they hid the exterior line-set so it barely shows. They even helped us through the Mass Save rebate paperwork."
"We had just bought the house and the central AC quit on us. They got out the same week and Mateus diagnosed and fixed it in one visit."
"Scheduled around our work-from-home days and the baby's nap times, showed up when they said they would, and left the place spotless."
Proudly serving Greater Boston.
Ready for a home that heats and cools like new?
Free in-home estimates across Greater Boston. Same-week install on most systems.