Calnan's Energy Systems Inc.

Calnan's Energy Systems is a family-run weatherization contractor based in Waltham, the kind of business homeowners call for a drafty attic, outdated windows, or doors that need replacing. The company's site says it has worked with local families since 1980, and its reviews consistently describe Rob Calnan as present through the job himself, with family members involved in the work. The written record — twenty reviews spanning 2017 through 2026 across Google, Angi, and BuildZoom — circles back to the same jobs again and again: attic and wall insulation, full window and door replacements, and trim and siding work done alongside them. In a 2023 review, one homeowner described reaching out to two other insulation companies first — one never called back, the other measured quickly but never followed through — before Calnan's completed the wall insulation on a 1940s Cape. Another, in 2021, said new windows and attic insulation cut their energy bills in half. Reviewers repeatedly mention Rob coordinating with other trades mid-project — roofers, HVAC crews, cleanup — and leaving the site tidy when the work involved dust or debris. As recently as this spring, one reviewer summed the experience up simply: "Awesome service." That consistency shows up in the numbers too: Angi puts the business at a 5.0 average across 157 ratings, with insulation Super Service Award wins stretching from 2008 to 2022; Google's smaller pool of 26 ratings averages 4.8; BBB grades the company A+. Its Massachusetts home improvement contractor registration is active. A couple of things are worth confirming before booking. A 2022 Google review, with no detail given, reported the business went unresponsive — an outlier against an otherwise steady record, but real enough to ask about directly. And a 2017 review noted that Calnan's doesn't participate in the Mass Save program, so anyone hoping to use that subsidy toward an insulation project should check financing separately rather than assume it's built in. For insulation, window and door replacement, or general weatherization work on an older Massachusetts home, Calnan's brings a long, consistent paper trail and a verified license. Ask about current scheduling, confirm whether Mass Save applies to your project, and get the estimate in writing before signing on.