13 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Clemson: Koala Insulation of Greenville, CR Score 80/100; 4.9★ from 444 Google reviews.
Best for emergencies (open 24/7): Atwood & Son, posts 24/7 hours; ranked #2 of 13.
Most-reviewed: American Eagle Home Improvement and Insulation, 27 Google reviews at 3.5★, the most of 13 ranked after Koala Insulation of Greenville; ranked #11.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
13 Clemson insulation contractors are ranked here by CR Score, from 8 published factors. 1 is open 24/7, 6 open Saturdays and 1 open Sundays, based on posted hours. The median Google rating is 5.0★ across 13 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Koala Insulation of Greenville | 80 | 4.9★ (444) | Piedmont, 22 mi away | — | Overall |
| 2 | Atwood & Son | 79 | 4.4★ (14) | Greenville, 25 mi away | 24/7 | Emergencies |
| 3 | C & M Insulation LLC | 77 | 4.4★ (16) | Anderson, 13 mi away | Sat | — |
| 4 | South Carolina Spray Foam Insulation | 77 | 5.0★ (10) | Anderson, 16 mi away | Sat | — |
| 5 | C & M Insulation | 76 | 5.0★ (6) | Anderson, 22 mi away | — | — |
| 6 | Alpha Spray Foam Insulation & Crawlspace Encapsulation Greenville SC | 76 | 5.0★ (24) | Greenville, 24 mi away | Sat | — |
| 7 | Discount Crawl Space | 75 | 5.0★ (19) | Seneca, 3 mi away | Sat | — |
| 8 | Glenco Foam & Insulation | 74 | 5.0★ (14) | Easley, 11 mi away | — | — |
| 9 | Extreme Spray Foam Seneca | 73 | 4.3★ (6) | Seneca, 8 mi away | — | — |
| 10 | Extreme Spray Foam of Anderson | 73 | 5.0★ (9) | Anderson, 16 mi away | — | — |
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 review volume: 4.9★ from 444 Google reviews, the most Google reviews on this list (444).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Greenville, 25 mi away
Ranked #2 because of its Google rating and availability: 4.4★ from 14 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Anderson, 13 mi away
Ranked #3 because of its Google rating and trade focus: 4.4★ from 16 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Anderson, 16 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Anderson, 22 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Greenville, 24 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Seneca, 3 mi away
Ranked #7 because of its Google rating and availability: 5.0★ from 19 Google reviews, open Saturdays until 6 PM.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Easley, 11 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Seneca, 8 mi away
Ranked #9 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Anderson, 16 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Anderson, 11 mi away
Ranked #11 because of its Google rating and trade focus: 3.5★ from 27 Google reviews, listed on Google as “Interior construction contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Gantt, 19 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “HVAC contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Piedmont, 24 mi away
Ranked #13 because of its Google rating and trade focus: 3.4★ from 17 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
9 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 |
|---|---|---|
| Emid | 9 mi | |
| Foam It | 10 mi | |
| Foothills Insulation Inc | 22 mi | |
| Galloway Bell Inc | 5.0★ (1) | 22 mi |
| Glenco Foam & Insulation, Inc | 21 mi | |
| Total Comfort Installations | 7 mi | |
| Total Comfort Installations (TCI) | In Clemson | |
| Trane The Wood Company Electrical Hvac Insulation | 14 mi | |
| Wood Insulating Inc | 7 mi |
National price ranges in USD, not adjusted for Clemson. 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 13 Clemson 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 Clemson 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 |