107 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Saint Helena: Ongaro & Sons, CR Score 64/100; 4.9★ from 1,222 Google reviews; open 24/7.
Best for emergencies (open 24/7): KC Home Services Plumbing, Heating & AC Repair, posts 24/7 hours; ranked #2 of 107.
Most-reviewed: Moore Home Heating Cooling & Plumbing Services, 1,764 Google reviews at 4.7★, the most of 107 ranked; ranked #9.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
107 Saint Helena HVAC contractors are ranked here by CR Score, from ten published factors. 21 are open 24/7, 49 open Saturdays and 39 open Sundays, based on posted hours. The median Google rating is 5.0★ across 107 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Ongaro & Sons | 64 | 4.9★ (1,222) | Santa Rosa, 14 mi away | 24/7 | Overall |
| 2 | KC Home Services Plumbing, Heating & AC Repair | 63 | 4.9★ (827) | Santa Rosa, 15 mi away | 24/7 | Emergencies |
| 3 | Bragg Home Services | 62 | 4.9★ (486) | Santa Rosa, 15 mi away | 24/7 | — |
| 4 | Next Day Air & Heating | 62 | 5.0★ (499) | Cotati, 18 mi away | 24/7 | — |
| 5 | Same Day Heating, Cooling, Plumbing | 62 | 4.9★ (531) | Windsor, 18 mi away | 24/7 | — |
| 6 | Ongaro & Sons | 61 | 4.9★ (538) | Petaluma, 20 mi away | 24/7 | — |
| 7 | Elevated Comfort | 61 | 4.9★ (949) | Cotati, 18 mi away | Sat · Sun · Evenings | — |
| 8 | Fuse HVAC & Appliance Repair Napa | 60 | 4.8★ (912) | Napa, 18 mi away | Sat · Sun | — |
| 9 | Moore Home Heating Cooling & Plumbing Services | 60 | 4.7★ (1,764) | Santa Rosa, 15 mi away | Sat · Evenings | Most reviews |
| 10 | Elevated Comfort | 60 | 4.9★ (320) | Santa Rosa, 15 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 1,222 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Rosa, 15 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 827 Google reviews, listed on Google as “Heating contractor”.
Based in Santa Rosa, 15 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 486 Google reviews, listed on Google as “HVAC contractor”.
Based in Cotati, 18 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 499 Google reviews, listed on Google as “Heating contractor”.
Based in Windsor, 18 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 531 Google reviews, listed on Google as “HVAC contractor”.
Based in Petaluma, 20 mi away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 538 Google reviews, listed on Google as “HVAC contractor”.
Based in Cotati, 18 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 949 Google reviews, listed on Google as “HVAC contractor”.
Based in Napa, 18 mi away
Ranked #8 because of its Google rating and trade focus: 4.8★ from 912 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Rosa, 15 mi away
Ranked #9 because of its Google rating and review volume: 4.7★ from 1,764 Google reviews, the most in Saint Helena.
Based in Santa Rosa, 15 mi away
Ranked #10 because of its Google rating and trade focus: 4.9★ from 320 Google reviews, listed on Google as “HVAC contractor”.
Based in Windsor, 18 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 866 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Rosa, 15 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 84 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Rosa, 14 mi away
Ranked #13 because of its Google rating and trade focus: 4.8★ from 99 Google reviews, listed on Google as “HVAC contractor”.
Based in Petaluma, 19 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 82 Google reviews, listed on Google as “HVAC contractor”.
Based in Rohnert Park, 17 mi away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 404 Google reviews, listed on Google as “HVAC contractor”.
Based in Rohnert Park, 17 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 44 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Rosa, 19 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 123 Google reviews, listed on Google as “HVAC contractor”.
Based in Sonoma, 12 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Rosa, 16 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 342 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Santa Rosa, 15 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “HVAC contractor”.
Based in Petaluma, 21 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “HVAC contractor”.
Based in Sonoma, 14 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 90 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Santa Rosa, 14 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 29 Google reviews, listed on Google as “HVAC contractor”.
Based in Rohnert Park, 16 mi away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 343 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Rosa, 15 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “HVAC contractor”.
#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 107 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 |
|---|---|---|
| Absolute Comfort Heating and Air Conditioning | 5.0★ (1) | 16 mi |
| AC Connection Inc ( Air Connection) | 5.0★ (2) | 15 mi |
| American Chiller Service, Inc. | 3.0★ (2) | 20 mi |
| Bell Products | 4.6★ (59) | 16 mi |
| CBS Plumbing & Heating | 5.0★ (2) | 16 mi |
| CM heating and air | 5.0★ (2) | 15 mi |
| ColdFlo Mechanical, Inc. | 3.0★ (2) | 24 mi |
| Constantini's Heating & Air Conditioning Service | 5.0★ (6) | 14 mi |
| Dale Heating Cooling & Sheetmetal, Inc. | 5.0★ (2) | 15 mi |
| Denny's Heating & Air Conditioning | 5.0★ (8) | 17 mi |
| FUSE Heating and Air Conditioning | 5.0★ (2) | 17 mi |
| Ledesma Heating Air | 5.0★ (2) | 20 mi |
| Madcon Inc. | 3.5★ (2) | 22 mi |
| PURE PLUMBER of ST. HELENA | 4.9★ (10) | In Saint Helena |
| Richardson Heating & Air Conditioning | 3.0★ (2) | 15 mi |
| Sonoma County Comfort Heating and Air | 5.0★ (9) | 24 mi |
| STANDARD HVAC NAPA | 5.0★ (2) | 18 mi |
| Starr Heating & Cooling | 5.0★ (1) | 16 mi |
| Todd Norris Plumbing & Heating | 5.0★ (2) | 22 mi |
| Zero Energy Associates | 5.0★ (9) | 20 mi |
National price ranges in USD, not adjusted for Saint Helena. 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 107 Saint Helena HVAC contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Saint Helena data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |