100 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Harvard: Efficient Buildings LLC, CR Score 84/100; 5.0★ from 10 Google reviews; open 24/7.
Best for emergencies (open 24/7): TH Finish Carpentry - Carpenter in Nashua, posts 24/7 hours; ranked #4 of 100.
Most-reviewed: Power Home Remodeling, 4,159 Google reviews at 4.7★, the most of 100 ranked; ranked #17.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
100 Harvard insulation contractors are ranked here by CR Score, from 8 published factors. 8 are open 24/7, 54 open Saturdays and 9 open Sundays, based on posted hours. The median Google rating is 4.8★ across 100 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Efficient Buildings LLC | 84 | 5.0★ (10) | Hudson, 7 mi away | 24/7 | Overall |
| 2 | Neeeco | 83 | 4.9★ (3,580) | Wilmington, 23 mi away | Sat · Evenings | — |
| 3 | EcoShield Pest Solutions | 82 | 4.8★ (3,069) | Winchester, 23 mi away | Sat | — |
| 4 | TH Finish Carpentry - Carpenter in Nashua | 80 | 5.0★ (12) | Nashua, 19 mi away | 24/7 | Emergencies |
| 5 | AirSealing America, LLC | 80 | 5.0★ (11) | West Concord, 11 mi away | Sat · Sun | — |
| 6 | Northeast Home & Energy | 80 | 4.9★ (225) | Grafton, 20 mi away | 24/7 | — |
| 7 | Premier Insulation | 79 | 4.8★ (26) | Gardner, 21 mi away | Sat · Sun · Evenings | — |
| 8 | East Coast Drywall Services | 79 | 5.0★ (13) | Lebanon, 18 mi away | Sat · Sun · Evenings | — |
| 9 | Freedom Insulation | 79 | 4.9★ (40) | Billerica, 7 mi away | Sat · Evenings | — |
| 10 | Endless Energy | 78 | 4.7★ (513) | Marlborough, 12 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and availability: 5.0★ from 10 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Wilmington, 23 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 3,580 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Winchester, 23 mi away
Ranked #3 because of its Google rating and trade focus: 4.8★ from 3,069 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Nashua, 19 mi away
Ranked #4 because of its Google rating and availability: 5.0★ from 12 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in West Concord, 11 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Grafton, 20 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 225 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Gardner, 21 mi away
Ranked #7 because of its Google rating and trade focus: 4.8★ from 26 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Lebanon, 18 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Billerica, 7 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 40 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Marlborough, 12 mi away
Ranked #10 because of its Google rating and availability: 4.7★ from 513 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Waltham, 20 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 278 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Acton, 6 mi away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 159 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Arlington, 16 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 29 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Framingham, 17 mi away
Ranked #14 because of its Google rating and trade focus: 4.5★ from 17 Google reviews, listed on Google as “Insulation contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Lowell, 16 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Natick, 19 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 32 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Waltham, 18 mi away
Ranked #17 because of its Google rating and review volume: 4.7★ from 4,159 Google reviews, the most Google reviews on this list (4,159).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Bedford, 16 mi away
Ranked #18 because of its Google rating and availability: 5.0★ from 15 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Burlington, 19 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 333 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Framingham, 17 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Marlborough, 11 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Woburn, 22 mi away
Ranked #22 because of its Google rating and trade focus: 4.7★ from 59 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Framingham, 11 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 54 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Acton, 14 mi away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 77 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Watertown, 22 mi away
Ranked #25 because of its Google rating and trade focus: 4.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 100 ranked insulation contractors here; the rest are on their profiles.
20 more insulation contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| AKS Attic Insulation & Roofing Services Inc, MA | 5.0★ (1) | 15 mi |
| Bay State Insulation | 5.0★ (2) | 23 mi |
| Brothers Painting | 5.0★ (2) | 18 mi |
| DENG'S Attic Insulation & Roofing Services Inc, MA | 1.0★ (2) | 15 mi |
| EcoMax Insulation | 5.0★ (2) | 23 mi |
| Foam Monsters | 5.0★ (1) | 11 mi |
| FRIG Attic Insulation & Roofing Services Framingham, MA | 5.0★ (1) | 18 mi |
| Greenstar Spray foam | 5.0★ (2) | 10 mi |
| HomeWorks Energy | 1.0★ (2) | 8 mi |
| Hot & Cold Energy | 1.0★ (1) | 9 mi |
| Kj's Energy Savers LLC | 5.0★ (2) | 23 mi |
| MX AZTECA INSULATION | 5.0★ (1) | 17 mi |
| Patrick Handyman LLC | 5.0★ (1) | 18 mi |
| Revise Inc. | 3.0★ (2) | 16 mi |
| Solergy llc | 5.0★ (2) | 21 mi |
| Sullivan Environmental Services | 5.0★ (1) | 10 mi |
| Y&J Attic Insulation Services & Roofing Services Of Newton, MA | 2.5★ (2) | 23 mi |
| ZND-A&A Attic-Solution & Insulation's & Roofing Service Tewksbury, MA | 5.0★ (1) | 17 mi |
| ZND-JACK Attic-Solution & Insulation's & Roofing Service Acton, MA | 5.0★ (2) | 9 mi |
| ZND-SAL Attic-Solution & Insulation's & Roofing Service Watertown, MA | 5.0★ (2) | 22 mi |
National price ranges in USD, not adjusted for Harvard. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Attic insulation | $1,700 | $2,100 | $2,500 | Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range | October 2026 |
We scored 100 Harvard insulation contractors on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Harvard data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |