5 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Durham: Royal Aire Solar, Heating, Air & Water, CR Score 87/100; 4.7★ from 718 Google reviews; open 24/7.
Most-reviewed: EcoGuard Pest Management, 115 Google reviews at 4.9★, the most of 5 ranked after Royal Aire Solar, Heating, Air & Water; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
5 Durham insulation contractors are ranked here by CR Score, from 8 published factors. 1 is open 24/7, 3 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.7★ across 5 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Royal Aire Solar, Heating, Air & Water | 87 | 4.7★ (718) | Chico, 5 mi away | 24/7 | Overall |
| 2 | EcoGuard Pest Management | 78 | 4.9★ (115) | Linda, 14 mi away | Sat · Sun · Evenings | Most reviews |
| 3 | Diaz Insulation | 74 | 4.4★ (19) | Chico, 9 mi away | — | — |
| 4 | Steve Caperello Painting | 73 | 5.0★ (4) | Chico, 5 mi away | Sat · Sun | — |
| 5 | Tugwell Roofing Co. - Chico Roofing Company | 66 | 4.1★ (14) | Chico, 8 mi away | — | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and review volume: 4.7★ from 718 Google reviews, the most Google reviews on this list (718).
Based in Linda, 14 mi away
Ranked #2 because of its Google rating and availability: 4.9★ from 115 Google reviews, open 7 days a week.
Based in Chico, 9 mi away
Ranked #3 because of its Google rating and trade focus: 4.4★ from 19 Google reviews, listed on Google as “Insulation contractor”.
Based in Chico, 5 mi away
Ranked #4 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 7 days a week.
Based in Chico, 8 mi away
Ranked #5 because of its Google rating and trade focus: 4.1★ from 14 Google reviews, listed on Google as “Roofing contractor”.
National price ranges in USD, not adjusted for Durham. 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 5 Durham 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 Durham 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 |