8 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Marion: RSP Heating and Cooling, CR Score 88/100; 4.9★ from 1,882 Google reviews; open 24/7.
Most-reviewed: Tabor Services, 248 Google reviews at 4.9★, the most of 8 ranked after RSP Heating and Cooling; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
8 Marion insulation contractors are ranked here by CR Score, from 8 published factors. 1 is open 24/7, 2 open Saturdays and 1 open Sundays, based on posted hours. The median Google rating is 4.8★ across 8 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | RSP Heating and Cooling | 88 | 4.9★ (1,882) | Carterville, 6 mi away | 24/7 | Overall |
| 2 | Armorguard Coatings LLC | 78 | 4.8★ (34) | Marion | — | — |
| 3 | JBS Spray Foam Insulation | 76 | 5.0★ (5) | Herrin, 7 mi away | Sat | — |
| 4 | SI Thermal Home Insulation | 72 | 3.2★ (13) | Marion | — | — |
| 5 | Tabor Services | 70 | 4.9★ (248) | Benton, 18 mi away | — | Most reviews |
| 6 | John's Mechanical Services | 68 | 5.0★ (4) | Marion | — | — |
| 7 | Darnell Heating & Cooling | 66 | 4.2★ (32) | West Frankfort, 11 mi away | — | — |
| 8 | Hegger Construction, Inc | 65 | 4.0★ (4) | Harrisburg, 22 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 1,882 Google reviews, the most Google reviews on this list (1,882).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Marion
Ranked #2 because of its Google rating and trade focus: 4.8★ from 34 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Herrin, 7 mi away
Ranked #3 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 Marion
Ranked #4 because of its Google rating and trade focus: 3.2★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Benton, 18 mi away
Ranked #5 because of its Google rating and review volume: 4.9★ from 248 Google reviews, 248 Google reviews.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Marion
Ranked #6 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in West Frankfort, 11 mi away
Ranked #7 because of its Google rating and trade focus: 4.2★ from 32 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Harrisburg, 22 mi away
Ranked #8 because of its Google rating and trade focus: 4.0★ from 4 Google reviews, listed on Google as “Contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
National price ranges in USD, not adjusted for Marion. 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 8 Marion 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 Marion 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 |