5 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Big Flats: Isaac Heating & Air Conditioning, CR Score 89/100; 4.8★ from 1,532 Google reviews; open 24/7.
Most-reviewed: Koala Insulation of Southern Tier NY, 87 Google reviews at 5.0★, the most of 5 ranked after Isaac Heating & Air Conditioning; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
5 Big Flats insulation contractors are ranked here by CR Score, from 8 published factors. 1 is open 24/7, 2 open Saturdays and 2 open Sundays, based on posted hours. The median Google rating is 4.2★ across 5 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Isaac Heating & Air Conditioning | 89 | 4.8★ (1,532) | Big Flats | 24/7 | Overall |
| 2 | Koala Insulation of Southern Tier NY | 88 | 5.0★ (87) | Corning, 3 mi away | — | Most reviews |
| 3 | PRO-LINE CONSTRUCTION | 71 | 4.0★ (4) | Corning, 8 mi away | Sat · Sun | — |
| 4 | Energy Tec | 68 | 3.7★ (6) | Ithaca, 21 mi away | — | — |
| 5 | Energy Savers NY LLC | 65 | 4.2★ (5) | Elmira, 9 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: 4.8★ from 1,532 Google reviews, the most Google reviews on this list (1,532).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Corning, 3 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 87 Google reviews, listed on Google as “Insulation contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Corning, 8 mi away
Ranked #3 because of its Google rating and availability: 4.0★ from 4 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Ithaca, 21 mi away
Ranked #4 because of its Google rating and trade focus: 3.7★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Elmira, 9 mi away
Ranked #5 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
National price ranges in USD, not adjusted for Big Flats. 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 Big Flats 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 Big Flats 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 |