Comfort you feel.
Efficiency you see.
Heat pumps, central AC, furnaces and boilers for New England homes, sized properly and installed by our own crews. Free in-home estimates, with same-week installs on most systems.
- 25+ yrs
- Experience
- 24/7
- Service
- 5.0★
- Google reviewed
Heating and cooling for New England homes
Every system we install is sized, installed, and commissioned by our own crew.
Heat Pumps
Cold-climate systems that heat down to -15°F and cool all summer.
Learn moreCentral AC
Quiet, high-SEER2 systems for older Boston homes with existing ductwork.
Learn moreDuctless Mini-Splits
Room-by-room control for additions, condos, and finished attics.
Learn moreFurnaces
96%+ AFUE gas furnaces with variable-speed blowers.
Learn moreBoilers
Condensing boilers for radiators, baseboards, and radiant floors.
Learn moreMaintenance Plans
Diamond Membership tune-ups twice a year, plus priority scheduling.
Learn moreWe are a Mass Save partner.
Mass Save is the statewide energy efficiency program run by Massachusetts utilities. It offers rebates and incentives for homeowners who upgrade to high-efficiency heating and cooling equipment like heat pumps, central AC, and ductless mini-splits.
The paperwork can be confusing, and the equipment has to meet specific standards to qualify. We handle that side of things for you. From the first estimate through the final installation, we make sure your system qualifies and the documentation is ready so you do not miss out on money you are entitled to.
What we help with
Common Mass Save HVAC incentives
- Qualifying cold-climate heat pumps and central AC systems
- Whole-home ductless and hybrid heating and cooling setups
- Proper sizing and documentation for rebate submissions
- Coordinating with your utility program requirements
Built for the way New Englanders actually live.
We are a young company with more than 20 years of field experience behind it. We started Black Diamond to do this work the way we always wanted to: straight answers, fair pricing, clean job sites.
We fix the cause, not the symptom
If the system is undersized or the ductwork is leaking, we tell you instead of patching it again.
Sized and commissioned properly
We run the load calculation and verify airflow and charge before we leave.
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."
Ready for a home that heats and cools like it should?
Free in-home estimates across Massachusetts, with same-week installs on most systems.