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The Energy Monster is a Massachusetts home-performance contractor that now trades as Wattson Home Solutions under new owners Heather Cassani and Patrick Burke. It says it has made energy-efficiency upgrades since 2008, running no-cost Mass Save assessments and installing insulation, spray foam, air sealing and ductless mini-splits. BuildZoom shows 171 permitted projects, with activity falling from 28 in 2023 to 6 in 2024 and 3 in 2025. Its customer reviews on Angi run from 2012 to 2017. In a 2016 review, a customer said the crew evaluated a crawlspace, pointed them to the Mass Save program, installed new fiberglass and foam board, sealed the edges and cleaned up. Another 2016 reviewer said the crew tested the house before and after the work and walked them through both results. A 2023 Reddit commenter said the company also fixed a bathroom vent that had been venting into the soffit. In a May 2026 r/somerville thread, a commenter who had to use Wattson for a Mass Save audit called the company useless and said Wattson never responds. The Massachusetts home improvement contractor registration #176201, held by Energy Monster, Inc., is expired on the state registry.
“But Wattson never responds and Eversource and MassSave says talk to them.”
“Had to use Wattson, the MassSave partner, to do the audit and they were useless.”
“Mine are from Wattson Home Solutions. So far, works fine.”
“Imo talk to Boston Solar or Wattson, maybe they can point you in the right direction?”
“I went with Monster Energy and have no regrets.”
Energy monster was very courteous, knowledgeable, and went way beyond, they cleaned , and vacuumed after all work was done, I would highly recommend them to everyone...outstanding company , shamus and his crew were awesome.
I needed to replace fiberglass insulation that was anchored under a crawlspace. Energy Monster did an evaluation, told me about the Mass Save program, suggested insulation that would work much better than what I originally contacted them for, and installed new fiberglass and foam board, sealed the edges, and cleaned up afterwards. I'm very happy with the work and will definitely be calling them again next year to add insulation to my attic.
Great people. They put down cloth to protect the floors from their boots. They tested the house before they started the work. They showed me results and explained them. They did the work, tested the house again and showed me the results again. BIG DIFFERENCE! They cleaned up everything afterwards, showed me and explained everything they had done and told me to call if I ever had any questions. Excellent!!
Steve and Chris were very professional.They finished in a timely maner and at a very reasonable price!!
Courteous, professional, pleasant to work with from their home energy audit through project completion, whole process was smooth, they gave me my nstar rebates, pricing was already set by mass save, mass save rep checked their work and was pleased and stated they are one of the best around, highly recommend them
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3 changes recorded — last scanned Aug 5, 2026.
Heat-pump sizing for a Victorian home5.0
Kept an addition warm all winter4.6
Active MA HIC license3.0
