19 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Harpswell Center: Seal It Insulation Systems, CR Score 60/100; 4.9★ from 190 Google reviews.
Most-reviewed: Evergreen Home Performance, 101 Google reviews at 4.7★, the most of 19 ranked after Seal It Insulation Systems; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
19 Harpswell Center insulation contractors are ranked here by CR Score, from ten published factors. 1 open Saturdays and 1 open Sundays, based on posted hours. The median Google rating is 4.9★ across 19 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Best for |
|---|---|---|---|---|---|
| 1 | Seal It Insulation Systems | 60 | 4.9★ (190) | Topsham, 11 mi away | Overall |
| 2 | Evergreen Home Performance | 55 | 4.7★ (101) | Portland, 19 mi away | Most reviews |
| 3 | Horizon Homes | 54 | 4.9★ (62) | Westbrook, 21 mi away | — |
| 4 | Mattra Inc. | 54 | 4.9★ (61) | Lewiston, 24 mi away | — |
| 5 | Insulation Systems of Maine | 54 | 5.0★ (12) | Auburn, 7 mi away | — |
| 6 | Rook Energy Solutions, LLC | 53 | 5.0★ (13) | Yarmouth, 10 mi away | — |
| 7 | Northeast Spray Insulation | 53 | 4.4★ (46) | Portland, 17 mi away | — |
| 8 | Southern Maine Spray Insulation | 53 | 4.7★ (25) | Portland, 18 mi away | — |
| 9 | Quality Insulation | 52 | 3.5★ (35) | Yarmouth, 10 mi away | — |
| 10 | Casco Bay Insulation Inc. | 52 | 5.0★ (18) | Westbrook, 19 mi away | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and review volume: 4.9★ from 190 Google reviews, the most in Harpswell Center.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 19 mi away
Ranked #2 because of its Google rating and trade focus: 4.7★ from 101 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westbrook, 21 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 62 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lewiston, 24 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 61 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Auburn, 7 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Yarmouth, 10 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 17 mi away
Ranked #7 because of its Google rating and trade focus: 4.4★ from 46 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 18 mi away
Ranked #8 because of its Google rating and trade focus: 4.7★ from 25 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Yarmouth, 10 mi away
Ranked #9 because of its Google rating and trade focus: 3.5★ from 35 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westbrook, 19 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Gorham, 19 mi away
Ranked #11 because of its Google rating and trade focus: 4.8★ from 18 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Auburn, 13 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Gorham, 23 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 17 mi away
Ranked #14 because of its Google rating and trade focus: 4.1★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Auburn, 22 mi away
Ranked #15 because of its Google rating and trade focus: 4.4★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Lewiston, 21 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in New Gloucester, 18 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lewiston, 23 mi away
Ranked #18 because of its Google rating and trade focus: 3.2★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Gorham, 20 mi away
Ranked #19 because of its Google rating and trade focus: 2.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
17 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 |
|---|---|---|
| Atlas Property Serrvices LLC. | 17 mi | |
| Black Bear Insulation L.L.C | 22 mi | |
| Dalton Insulation Co | 3.0★ (1) | 22 mi |
| Damon Insulation Co | 21 mi | |
| Foam Pro Inc | 5.0★ (1) | 24 mi |
| G & G Insulation Co | 5.0★ (2) | 20 mi |
| Grey Ghost Construction | 15 mi | |
| High Efficiency Foam | 20 mi | |
| MidMaine Blower Door LLC | 5.0★ (1) | 25 mi |
| New England Spray Foam Insulation | 11 mi | |
| Northeast Insulation Services | 9 mi | |
| Portland Insulation Inc | 5.0★ (2) | 19 mi |
| Statewide Foam & Coatings Inc. | 16 mi | |
| Steve's shop | 21 mi | |
| Thermal-Lock Inc | 19 mi | |
| Weather Seal Spray Foam Solutions | 5.0★ (1) | 9 mi |
| Weatherize Northeast | 5.0★ (1) | 24 mi |
National price ranges in USD, not adjusted for Harpswell Center. 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 19 Harpswell Center insulation contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Harpswell Center data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |