20 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in O'Fallon: Bug Out, CR Score 80/100; 4.9★ from 87 Google reviews; open 24/7.
Best for emergencies (open 24/7): Guaranteed Comfort and Energy, posts 24/7 hours; ranked #4 of 20.
Most-reviewed: Energy Stars Heating & Cooling Co, 1,175 Google reviews at 4.9★, the most of 20 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
20 O'Fallon insulation contractors are ranked here by CR Score, from 8 published factors. 2 are open 24/7, 6 open Saturdays and 4 open Sundays, based on posted hours. The median Google rating is 4.8★ across 20 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Bug Out | 80 | 4.9★ (87) | St. Louis, 17 mi away | 24/7 | Overall |
| 2 | Brady Pest Solutions | 80 | 4.8★ (36) | Collinsville, 8 mi away | Sat | — |
| 3 | Energy Stars Heating & Cooling Co | 79 | 4.9★ (1,175) | East Saint Louis, 15 mi away | Sat | Most reviews |
| 4 | Guaranteed Comfort and Energy | 78 | 4.6★ (38) | Maryville, 10 mi away | 24/7 | Emergencies |
| 5 | Goley, Inc. | 78 | 4.9★ (240) | Columbia, 18 mi away | — | — |
| 6 | Koala Insulation of St. Louis | 77 | 4.9★ (430) | St. Louis, 24 mi away | — | — |
| 7 | Foundation Recovery Systems Downtown St. Louis | 77 | 4.9★ (72) | St. Louis, 16 mi away | Sat · Sun · Evenings | — |
| 8 | St. Louis Insulation of Metro East Illinois | 75 | 4.8★ (24) | Troy, 10 mi away | — | — |
| 9 | Thornburgh Insulation Inc | 74 | 5.0★ (5) | St. Louis, 21 mi away | Sun · Evenings | — |
| 10 | Janssen Heating Cooling Plumbing & Insulation | 74 | 5.0★ (52) | East Alton, 22 mi away | Sat | — |
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: 4.9★ from 87 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Collinsville, 8 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 36 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in East Saint Louis, 15 mi away
Ranked #3 because of its Google rating and review volume: 4.9★ from 1,175 Google reviews, the most Google reviews on this list (1,175).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Maryville, 10 mi away
Ranked #4 because of its Google rating and availability: 4.6★ from 38 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Columbia, 18 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 240 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 24 mi away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 430 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 16 mi away
Ranked #7 because of its Google rating and availability: 4.9★ from 72 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Troy, 10 mi away
Ranked #8 because of its Google rating and trade focus: 4.8★ from 24 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 21 mi away
Ranked #9 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 East Alton, 22 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 52 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Belleville, 8 mi away
Ranked #11 because of its Google rating and trade focus: 4.1★ from 28 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Waterloo, 13 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in East Alton, 24 mi away
Ranked #13 because of its Google rating and trade focus: 4.1★ from 8 Google reviews, listed on Google as “Insulation contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in St. Louis, 19 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 22 mi away
Ranked #15 because of its Google rating and trade focus: 3.9★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 23 mi away
Ranked #16 because of its Google rating and review volume: 4.8★ from 131 Google reviews, 131 Google reviews.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 25 mi away
Ranked #17 because of its Google rating and trade focus: 4.7★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in East Saint Louis, 15 mi away
Ranked #18 because of its Google rating and trade focus: 3.9★ from 10 Google reviews, listed on Google as “Painter”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 18 mi away
Ranked #19 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Webster Groves, 24 mi away
Ranked #20 because of its Google rating and trade focus: 2.3★ from 3 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
National price ranges in USD, not adjusted for O'Fallon. 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 20 O'Fallon 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 O'Fallon 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 |