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Typical Greater Boston range for this kind of work, from regional averages — not a quote from AirTight Home Services LLC, DBA Air-Tight Weatherization. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$5,000 – $11,400
Typical HVAC project around $8,200
Air-Tight Weatherization runs two businesses out of one truck fleet in Middleton — HVAC work (furnaces, mini-splits, heat pumps) and the insulation and weatherization jobs that give the company its name, much of it referred through Mass Save. On Google it holds a 4.6-star average from 95 ratings, built mostly on installs and multi-day insulation crews rather than single quick calls. The specific jobs customers describe skew toward complicated ones. A 2025 review credits the crew with coordinating a full oil-to-gas conversion alongside National Grid before installing a new central air and heating system. A 2022 review of a close-cell attic and rim-joist job reports meaningfully better blower-test numbers afterward. On pricing, a 2025 customer says the company beat two competing quotes on hot water heater work, and a 2024 reviewer chose it specifically because it didn't push a pricier heat-pump upsell the way other bidders did. There's a real cluster of complaints worth knowing about, mostly from late 2025 and earlier: one customer says a smart-thermostat install went unresolved after repeated follow-up calls, another never received a promised inspection report, and a third says the electrician sent for a knob-and-tube wiring check skipped part of the scoped work order. Separately, an early-2025 Mass-Save-referred insulation job drew a one-star account of a multi-day job with wall damage and a post-work inspection that found the attic and basement air sealing incomplete — the reviewer says the house ended up less insulated than when the crew arrived. For a straightforward HVAC swap or an insulation job coordinated through Mass Save, the reviews lean solidly positive; for anything requiring precise scope adherence or a fast callback on a loose end, it's worth confirming the plan and getting a firm follow-up commitment before the crew leaves.
Rudi was awesome. Very informative and great communication on arrival time!
Excellent service from start to finish! The team was professional, knowledgeable, and truly committed to doing quality work. They took the time to explain everything clearly, worked efficiently, and made sure the job was done right. It’s refreshing to work with a company that takes such pride in their work and treats customers with respect. Thank you!!!
I don't like doing this, but since you won't call me back to complete the job you said you would, the only course of action I have is to leave you a negative review. I requested to have my smart thermostat installed. Someone came out and said the wiring was wrong and fixed it. He plugged in the smart thermostat and it didn't work. After some back and forth the technician promised me that if I bought another one it would work (the other 1 of the exact same model did not work). I was skeptical, but willing to play along. The brand new one didn't work as well. I called AirTight back and was told "I've got you covered, I'll call you later to setup an appointment". He never called, I called a few days later leaving a message with someone for him to call me back. Nothing for a week. I then called again and left a message on voice mail. No call back. So no, you don't have me covered.
The furnace install was just ok. They arrived with a team of people. They took a whole day to have it setup. One of them was very personable, however the team lead was very rude. After installing the furnace they couldn't get it to work correctly on day 1, due to wiring connections and had to bypass the security sensor. I am not sure if it was a lack of knowledge but they came out again another day and finally got it running the proper way. The install day was a little rainy and by the time the team left, my basement was all muddy and I had to mop it out the next day. Since this install was done through CTI, I had not much say in picking a contractor for the installation.
Evaluation of heating systems , asked for a detailed report on what was determined to be the issue! I haven’t received any information as of now ! Tecnitian seems well educated
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1 change recorded — last scanned Sep 19, 2026.