# Calnan's Energy Systems Inc.

**Trade:** Insulation & Weatherization · **Address:** 105 Harvard St #5, Waltham, MA 02453 · **Phone:** (781) 894-9626 · **Website:** https://www.calnansenergy.com/ · **Languages:** English

**Rating: 4.5/5** (medium confidence) — from 20 reviews across 7 sources.
95% of sentiment-scored reviews read net-positive. Last 6 months: 1 reviews, 0 negative.

## The honest read

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is a family-run weatherization contractor based in Waltham, the kind of business homeowners call for a drafty attic, outdated windows, or doors that need replacing.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.

**Strengths:**
- Attic and wall insulation — praised across years of Google and BuildZoom reviews
- Owner on every job — reviewers describe Rob Calnan present through each project
- Window and door replacements — repeated praise for tidy, detailed trim work
- Consistently high ratings — A+ BBB, 5.0 Angi, 4.8 Google across decades

**Concerns:**
- One unresponsive report — a 2022 Google review cited no follow-up
- No Mass Save partnership — a 2017 review flagged no subsidy participation

## Claims & citations

Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication.

- Rob Calnan and his crew are described repeatedly as attentive and communicative, coordinating with other trades and keeping job sites tidy on insulation and window projects. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2pGSFNrazNWWFZKTms4M1gwRktjM1p1V0MxU2JXYxAB!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CAIQACodChtycF9oOjFHSkk3VXVJNk83X0FKc3ZuWC1SbWc%7C%7C?hl=en) — “5★ 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 jo…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUQyd2VTbWZREAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgID2weSmfQ%7C%7C?hl=en) — “5★ Quality work, owner is on site every day, true craftsmanship, reasonable pricing, and honest. Over the last 10 yearsand 3 different jobs …”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUQ2dVpPSkZnEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgID6uZOJFg%7C%7C?hl=en) — “5★ They gave different options for insulating the rim joistand explained the pros and cons of each. They were personable, unobtrusive and co…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUQ2dU51Tmx3RRAB!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgID6uNuNlwE%7C%7C?hl=en) — “5★ Rob and his crew’s work was exceptional. His initial consultation gave me a great deal of confidence about moving forward with a difficul…”
- Customers report attic, wall, and rim-joist insulation work and full window and door replacements completed cleanly, including a 2023 case where a 1940s Cape's wall insulation was done after two competitors fell through. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSURwdmFmZ2RBEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgIDpvafgdA%7C%7C?hl=en) — “5★ Absolutely HANDS DOWN - we had THE best experience with Calnan's Energy Systems!

I'd reached out to two other insulation companies to ge…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNobnY3VFlnEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgIChnv7TYg%7C%7C?hl=en) — “5★ After a poor experience with Revise energy, I reached out to Calnan in the hopes of having quality work performed. They exceeded my expec…”
- Strong third-party ratings: BBB grades the business A+, Angi shows a 5.0 average across 157 reviews with insulation Super Service Award wins from 2008 through 2022, and Google shows 4.8 from 26 ratings. _(confidence: high)_
  - [Google](https://www.google.com/maps/search/?api=1&query=Calnan%E2%80%99s%20Energy%20Systems%2C%20Inc.&query_place_id=ChIJZ_CBTSaD44kRJKoy5Yg_d9w) — “Google: 4.8★ from 26 ratings”
  - [Better Business Bureau](https://www.bbb.org/us/ma/waltham/profile/insulation-contractors/calnans-energy-systems-inc-0021-12001) — “Better Business Bureau grade: A+”
  - [Angi](https://www.angi.com/companylist/us/ma/waltham/calnan%27s-energy-systems-inc-reviews-189904.htm) — “Angi: 5.0★ from 157 ratings”
  - [Angi](https://www.angi.com/companylist/us/ma/waltham/calnan%27s-energy-systems-inc-reviews-189904.htm) — “Angi star distribution: 99% 5★ · 1% 4★ (of 157 ratings)”
  - [Angi](https://www.angi.com/companylist/us/ma/waltham/calnan%27s-energy-systems-inc-reviews-189904.htm) — “Listed certification: Angie's List Super Service award winner in Insulation for 2008, 2009, 2010, 2011, 2013, 2014, 2015, 2016, 2017, 2018, …”
- Holds an active Massachusetts home improvement contractor registration, verified against the state registry. _(confidence: high)_
  - [State License Registry](https://contractorhub.mass.gov/s/hic-contractor-search) — “MA hic license 108453 registry-verified active — registry holder of record: CALNAN ENERGY SYSTEMS, INC.”
- The company says on its site that it has served area homeowners since 1980, with direct owner supervision and family involvement on projects. _(confidence: medium)_
  - [Official Website](https://www.calnansenergy.com) — “Company history (self-reported): The site states that Calnan’s Energy Systems, Inc. has been helping local homeowners since 1980.”
  - [Official Website](https://www.calnansenergy.com) — “Ownership (self-reported): The site states that direct supervision by the owner occurs on each project and that family members are involved.”
  - [Official Website](https://www.calnansenergy.com) — “Stated ownership (self-reported): Family-owned”
- Reviews describe trim, door, and siding replacement alongside window work, extending into finish carpentry. _(confidence: low)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNSeWR5QXRnRRAB!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgICRydyAtgE%7C%7C?hl=en) — “5★ Rob Calnan has replaced 2/3rds of the windows in our house, and I only wish I’d known about him when I had the first third done. He’s rep…”
- A 2022 Google review reported the business did not respond, with no further detail given. _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUR1em9EenJnRRAB!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgIDuzoDzrgE%7C%7C?hl=en) — “1★ No Response”
- A 2017 BuildZoom review noted Calnan's is not part of the Mass Save subsidy program. _(confidence: medium)_
  - [BuildZoom](https://www.buildzoom.com/contractor/calnans-energy-systems-inc) — “5★ The attic insulation was completed professionally and I would recommend Calnan to a friend. Be aware though that Calnan is not part of th…”
- Twenty reviews from 2017 to 2026 across seven platforms are almost entirely five-star, with only one negative report lacking detail. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUR1em9EenJnRRAB!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgIDuzoDzrgE%7C%7C?hl=en) — “1★ No Response”
  - [Angi](https://www.angi.com/companylist/us/ma/waltham/calnan%27s-energy-systems-inc-reviews-189904.htm) — “Angi star distribution: 99% 5★ · 1% 4★ (of 157 ratings)”
- Specializes in Insulation & Weatherization _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNobnY3VFlnEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgIChnv7TYg%7C%7C?hl=en) — “5★ After a poor experience with Revise energy, I reached out to Calnan in the hopes of having quality work performed. They exceeded my expec…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUQyd2VTbWZREAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgID2weSmfQ%7C%7C?hl=en) — “5★ Quality work, owner is on site every day, true craftsmanship, reasonable pricing, and honest. Over the last 10 yearsand 3 different jobs …”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUQ2dVpPSkZnEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgID6uZOJFg%7C%7C?hl=en) — “5★ They gave different options for insulating the rim joistand explained the pros and cons of each. They were personable, unobtrusive and co…”
  - [Official Website](https://www.calnansenergy.com) — “Calnan’s Energy Systems provides residential weatherization services including replacement windows and doors, insulation, retrofits, and rel…”
  - [Better Business Bureau](https://www.bbb.org/us/ma/waltham/profile/insulation-contractors/calnans-energy-systems-inc-0021-12001) — “Services offered (Better Business Bureau): installation of insulation, replacement windows and doors, storm windows and doors, air sealing o…”
- Specializes in Windows / Siding / Gutters _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNSeWR5QXRnRRAB!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgICRydyAtgE%7C%7C?hl=en) — “5★ Rob Calnan has replaced 2/3rds of the windows in our house, and I only wish I’d known about him when I had the first third done. He’s rep…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUMyaTQtY1NnEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgIC2i4-cSg%7C%7C?hl=en) — “5★ Calnan Energy replaced my bathroom window. The attention to detail and the quality of work were astonishing and far beyond my expectation…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNXd3ZTTkRnEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgICWwvSNDg%7C%7C?hl=en) — “5★ We used Rob to replace windows. The work is done professionally and he takes care of details very well. The service is courteous and genu…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUM2dnEza2FnEAE!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgIC6vq3kag%7C%7C?hl=en) — “5★ Robert Calnan and his crew replaced all the windows in my house and added insulation in the attic.  My energy bills were reduced by half.…”
  - [Better Business Bureau](https://www.bbb.org/us/ma/waltham/profile/insulation-contractors/calnans-energy-systems-inc-0021-12001) — “Services offered (Better Business Bureau): installation of insulation, replacement windows and doors, storm windows and doors, air sealing o…”
- Also offers Carpentry _(confidence: low)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNSeWR5QXRnRRAB!2m1!1s0x0:0xdc773f88e532aa24!3m1!1s2@1:CIHM0ogKEICAgICRydyAtgE%7C%7C?hl=en) — “5★ Rob Calnan has replaced 2/3rds of the windows in our house, and I only wish I’d known about him when I had the first third done. He’s rep…”

## Ownership

- Identifies as family-owned — the business's own statement, not independently verified.

## License

Status: **active** (#108453, hic) — verified against the official MA state registry on 2026-09-04, never self-reported.
Re-check at the official registry: https://contractorhub.mass.gov/s/hic-contractor-search

## Sources

- [Google](https://www.google.com/maps/search/?api=1&query=Calnan's%20Energy%20Systems%20Inc.&query_place_id=ChIJZ_CBTSaD44kRJKoy5Yg_d9w): 4.8★ from 26 ratings
- [Google Reviews](https://www.google.com/maps/search/?api=1&query=Calnan's%20Energy%20Systems%20Inc.&query_place_id=ChIJZ_CBTSaD44kRJKoy5Yg_d9w): Listed on this source
- [Official Website](https://www.calnansenergy.com): Self-reported profile and service details
- [Exa](https://www.experience.com/reviews/calnans-22649303): 0 web mentions across the open web (each linked to its source)
- [Better Business Bureau](https://www.bbb.org/us/ma/waltham/profile/insulation-contractors/calnans-energy-systems-inc-0021-12001): Listed on this source
- [BuildZoom](https://www.buildzoom.com/contractor/calnans-energy-systems-inc): 5.0★ from 1 ratings
- [Angi](https://www.angi.com/companylist/us/ma/waltham/calnan%27s-energy-systems-inc-reviews-189904.htm): 5.0★ from 157 ratings

## Recent reviews

- **5/5 · Google Reviews · Auto Factory Automotive · 2026-03-24**: Awesome service!
- **5/5 · Google Reviews · Munroe · 2024-02-09**: Prompt, kind and knowledgeable. Job work completed in a very timely manner with great care for my surrounding landscape.
- **5/5 · Google Reviews · Duvvuri Sridhar · 2025-12-14**: 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 …
- **5/5 · Angi · Karen M. · 2024-02-01**: Calnan Energy promptly gave me an estimate to replace our damaged bulkhead. They were professional, punctual and very patient explaining the process. Very quick response getting the estimate and getting my job done. It's a family owned and run company - could not have been any nicer and did a meticu…
- **5/5 · Google Reviews · Adam Mouneimneh · 2023-09-16**: 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 …
- **5/5 · Google Reviews · Sarah Lawrence · 2023-08-27**: 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 thei…
- **5/5 · Google Reviews · Miriam R · 2023-04-04**: Rob Calnan has replaced 2/3rds of the windows in our house, and I only wish I’d known about him when I had the first third done. He’s replaced doors, trim, and siding as well. His work is always tidy and it’s nearly impossible to tell that something was replaced. He does a great job on our quirky ol…
- **5/5 · Google Reviews · Connor McCullough · 2023-03-29**: Rob came highly recommended by a reputable roofing contractor that praised his attention to detail, trustworthiness and professional approach to business. I reached out for a quote on insulation work and he came out very quickly thereafter to walk through my house with me. After knocking out the fir…
- **5/5 · Google Reviews · Mark Miller · 2023-02-13**: After a poor experience with Revise energy, I reached out to Calnan in the hopes of having quality work performed. They exceeded my expectations. R60 cellulose for the attic with R60 foam board for the verticals. The house is SO much more comfortable now. They also put in a cat walk in the attic so …
- **1/5 · Google Reviews · Ke Jin · 2022-08-20**: No Response

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Data freshness: last scanned 2026-09-04T22:36:04.833Z.
Cite as: Calnan's Energy Systems Inc. — Tavlee (https://tavlee.com/contractor/calnan-s-energy-systems-inc-waltham)
Source: https://tavlee.com/contractor/calnan-s-energy-systems-inc-waltham