Calnan’s Energy Systems, Inc.

Insulation Contractors, Insulation Installation, Windows Installation

105 Harvard St #5, Waltham, MA 02453

About Calnan’s Energy Systems, Inc.

Calnan’s Energy Systems, Inc. has been dedicated to enhancing home energy efficiency since 1980, specializing in residential weatherization services, including the installation of replacement windows, doors, and energy-saving insulation. Customers consistently praise the professionalism and expertise of Rob and his crew. Many reviews highlight their exceptional service, noting how they take the time to understand the specific needs of each project, ensuring high-quality results. Clients report positive experiences, describing the team as thoughtful, considerate, and reliable. One customer emphasized the crew's prompt communication and thorough explanations throughout the process, which included insulation work on a 1940s home. The project was completed efficiently, with no mess left behind, and the difference in noise levels was immediately noticeable. Customers express eagerness to work with Calnan’s Energy Systems again, particularly appreciating the positive impact on energy savings. Overall, Calnan’s Energy Systems, Inc. is highly recommended for anyone looking to improve their home’s energy efficiency through professional and friendly service.

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Reviews for Calnan’s Energy Systems, Inc.

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  • Dec 2025

    Rob and his team are amazing to work with. They will go above and beyond to ensure that the work is of highest quality. The insulation job on my 70 year old house was complicated. Rob had to co-ordinate with roofers (i was also changing my roof), HVAC team and cleaners (mess from a previous job) to appropriately insulate my home. He was also able to get me a good rate on the HVAC work. He and his team are very considerate and ensured that I was fully satisfied. When issues came up, they would clearly and quickly communicate and help identify a cost effective solution. They are amazing at what they do and I can clearly see a difference in my home comfort level and not...read full review

  • Sep 2023

    Rob and his crew were amazing in every possible way. They took the time to understand what I was trying to accomplish beyond replacing my windows and doors, and the final product shows. The work they did was impeccable, and they were very thoughtful, considerate and professional throughout. I can't say enough good things about them and the work they do. I look forward to working with them again in the future, and I would recommend hiring Rob and his crew without reservation.

  • Sep 2023

    Absolutely HANDS DOWN - we had THE best experience with Calnan's Energy Systems!I'd reached out to two other insulation companies to get quotes to have the walls of our 1940's Cape insulated -- one company never got back to me, and the other came out to measure quickly but I had to chase down their prohibitively-high quote call after call, for a couple weeks.Rob Calnan came out promptly, took the measurements and explained the process and the materials used. He kept in touch, keeping us updated on the status of the building permit, when our work would start (no small feat during this mostly-rainy summer!), and was here as the insulation was going in.Rob and his sons...read full review

Hours

Monday: 7:30AM - 5PM
Tuesday: 7:30AM - 5PM
Wednesday: 7:30AM - 5PM
Thursday: 7:30AM - 5PM
Friday: 7:30AM - 5PM
Saturday: ClosedSunday: Closed

Location

105 Harvard St #5, Waltham

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