132 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Cotati: Next Day Air & Heating, CR Score 95/100; 5.0★ from 499 Google reviews; open 24/7.
Best for emergencies (open 24/7): Ongaro & Sons, posts 24/7 hours; ranked #2 of 132.
Most-reviewed: Moore Home Heating Cooling & Plumbing Services, 1,764 Google reviews at 4.7★, the most of 132 ranked; ranked #17.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
132 Cotati HVAC contractors are ranked here by CR Score, from 8 published factors. 23 are open 24/7, 58 open Saturdays and 48 open Sundays, based on posted hours. The median Google rating is 5.0★ across 132 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Next Day Air & Heating | 95 | 5.0★ (499) | Cotati | 24/7 | Overall |
| 2 | Ongaro & Sons | 94 | 4.9★ (1,222) | Santa Rosa, 8 mi away | 24/7 | Emergencies |
| 3 | KC Home Services Plumbing, Heating & AC Repair | 94 | 4.9★ (827) | Santa Rosa, 6 mi away | 24/7 | — |
| 4 | Ongaro & Sons | 93 | 4.9★ (538) | Petaluma, 6 mi away | 24/7 | — |
| 5 | Elevated Comfort | 92 | 4.9★ (949) | Cotati | Sat · Sun · Evenings | — |
| 6 | Bragg Home Services | 91 | 4.9★ (486) | Santa Rosa, 11 mi away | 24/7 | — |
| 7 | Same Day Heating, Cooling, Plumbing | 90 | 4.9★ (531) | Windsor, 15 mi away | 24/7 | — |
| 8 | Milano Mechanical | 90 | 5.0★ (82) | Petaluma, 5 mi away | 24/7 | — |
| 9 | Northbay Comfort Inc. | 90 | 5.0★ (44) | Rohnert Park, 2 mi away | 24/7 | — |
| 10 | The Duct Doctor | 89 | 5.0★ (84) | Santa Rosa, 8 mi away | 24/7 | — |
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: 5.0★ from 499 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 8 mi away
Ranked #2 because of its Google rating and availability: 4.9★ from 1,222 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 6 mi away
Ranked #3 because of its Google rating and availability: 4.9★ from 827 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petaluma, 6 mi away
Ranked #4 because of its Google rating and availability: 4.9★ from 538 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Cotati
Ranked #5 because of its Google rating and trade focus: 4.9★ from 949 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 11 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 486 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Windsor, 15 mi away
Ranked #7 because of its Google rating and availability: 4.9★ from 531 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petaluma, 5 mi away
Ranked #8 because of its Google rating and availability: 5.0★ from 82 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Rohnert Park, 2 mi away
Ranked #9 because of its Google rating and availability: 5.0★ from 44 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 8 mi away
Ranked #10 because of its Google rating and availability: 5.0★ from 84 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Novato, 20 mi away
Ranked #11 because of its Google rating and availability: 4.9★ from 480 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Cotati
Ranked #12 because of its Google rating and availability: 5.0★ from 19 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 10 mi away
Ranked #13 because of its Google rating and availability: 4.8★ from 99 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petaluma, 7 mi away
Ranked #14 because of its Google rating and availability: 5.0★ from 30 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 11 mi away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 320 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Rohnert Park, 2 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 404 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 9 mi away
Ranked #17 because of its Google rating and review volume: 4.7★ from 1,764 Google reviews, the most Google reviews on this list (1,764).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petaluma, 4 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 39 Google reviews, listed on Google as “Air conditioning contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Windsor, 15 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 866 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Napa, 23 mi away
Ranked #20 because of its Google rating and trade focus: 4.8★ from 912 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 11 mi away
Ranked #21 because of its Google rating and availability: 5.0★ from 12 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 17 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 123 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 10 mi away
Ranked #23 because of its Google rating and availability: 5.0★ from 15 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 9 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 29 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sonoma, 12 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 132 ranked HVAC contractors here; the rest are on their profiles.
20 more HVAC 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 |
|---|---|---|
| AC Connection Inc ( Air Connection) | 5.0★ (2) | 9 mi |
| American Chiller Service, Inc. | 3.0★ (2) | 5 mi |
| Constantini's Heating & Air Conditioning Service | 5.0★ (6) | 13 mi |
| Core Heating & Air Conditioning | 5.0★ (76) | 5 mi |
| Denny's Heating & Air Conditioning | 5.0★ (8) | 23 mi |
| Facciano HVAC and Sheet Metal | 3.0★ (2) | 18 mi |
| Gene Burch Plumbing Heating & Air | 4.9★ (588) | 20 mi |
| Grupé HVAC | 5.0★ (43) | 5 mi |
| HVAC Controls Corp | 2.0★ (1) | In Cotati |
| Icon Plumbing & Design | 4.0★ (4) | 25 mi |
| Integrated Climate Systems | In Cotati | |
| Kelly Plumbing & Heating | 4.9★ (308) | 17 mi |
| Ledesma Heating Air | 5.0★ (2) | 8 mi |
| North End Plumbing, Heating & Air | 5.0★ (86) | 5 mi |
| Richardson Heating & Air Conditioning | 3.0★ (2) | 15 mi |
| Royal Electricity Empire Inc. | 5.0★ (52) | In Cotati |
| Samson Home Service | 5.0★ (15) | In Cotati |
| Scott Silva Plumbing | 5.0★ (1) | In Cotati |
| SERVPRO of Lafayette/Moraga/Orinda | 4.6★ (22) | In Cotati |
| Valley Comfort Heating and Air | 4.7★ (93) | 7 mi |
National price ranges in USD, not adjusted for Cotati. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
In California, Contractors State License Board (CSLB) licenses C-20 Warm-Air Heating, Ventilating and Air-Conditioning contractor license.
Jobs of $1,000 or more in labor and materials (from January 1, 2025).
No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.
Guide checked October 2026. How we verify licenses
California's HVAC demand peaks during summer heat waves and the first cold snaps. Spring and fall are the easiest times to book maintenance.
We scored 132 Cotati HVAC 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 Cotati 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 |