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The Weatherize Guyz ,LLC
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Mill City Energy is an Auburn, New Hampshire, home-performance company built around energy audits and the insulation and air-sealing work that follows them — attic sealing, cellulose insulation, rim-joist and kneewall work, spray foam. The company's own site describes home energy audits, efficiency improvements and consultation for New Hampshire homeowners, and owner Mike Joy is named directly by several of the customers who hired the crew. The Google page carries sixteen five-star reviews stretching from 2023 through this year, with none negative. The specifics repeat: crews that show up promptly, finish on schedule even around an early snowstorm, and leave the site spotless each day. One customer's job covered attic air sealing, blown cellulose replacement, kneewall insulation and air sealing, basement rim-joist insulation and air sealing, and spray foaming an addition's floor — the kind of full-house weatherization push the reviews describe again and again. Another customer had the crew back for a second home, and one reviewer said they were matched with the company through the MassSave energy-efficiency program via an outside energy consultant. Worth asking up front: at least one customer came to the company through that MassSave referral pathway rather than booking directly, so it's worth checking whether your project would run through a similar program or get scheduled straight with the company. For anything from a single insulation upgrade to a full attic-to-basement air-sealing push, the reviews point to a crew that finishes clean and on time — get a walkthrough scheduled and ask how the audit and installation stages are sequenced for your home.
Very conscientious and hard working crew!
Mill City Energy completed several projects at my home including attic air sealing, blown cellulose replacement, kneewall insulation and air sealing, basement rim joist insulation and air sealing, and spray foaming the floor of an addition. They also installed ducting for a bathroom fan and built some better dams in the attic around the access hatch and chimney. Ryan, Larry, and team all had clear communication, were honest, and performed thorough quality workmanship. I will hire them again for future insulation projects because they did such a good job.
Mill City Energy was exceptionally professional and thorough. the job was done on time and with no interruptions to our schedule. Mike and his team did a great job on the install and cleanup. I would highly endorse their services.
Mill City Energy was great. Had some insulation work done. Crew was prompt, friendly and cleaned up very well. Mike, the owner, is great. I had a very tight timeframe, and they were able to get someone out very quickly
Do you know why one of the insulation guys had quit? Because he couldnt keep it cool under pressure!!! Hahaha This team is quick and thorough, Mike Joy has a crew of guys, with a ton of years experience and the knowledge required to keep things cool under pressure! And Warm!! If you need help with insulation questions or you just want to know how drafty your home actually is and why, you are you losing heat? Give Bryan Cantera, Mike's right hand man, a call at Mill City and tell him that Trash Goblin sent you!
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1 change recorded — last scanned Sep 2, 2026.
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