66/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 762 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 762 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 11 Ross Ave, San Anselmo, CA 94960
Best HVAC Contractors in San Anselmo, CA (2026)
264 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in San Anselmo: Ongaro & Sons, CR Score 66/100; 4.9★ from 762 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Bellows Plumbing, Heating, Cooling & Electrical, posts 24/7 hours; ranked #2 of 264.
- 3
Most-reviewed: Albert Nahman Plumbing, Heating, and Cooling, 3,311 Google reviews at 4.7★, the most of 264 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
264 San Anselmo HVAC contractors are ranked here by CR Score, from ten published factors. 50 are open 24/7, 160 open Saturdays and 131 open Sundays, based on posted hours. The median Google rating is 4.9★ across 264 rated businesses.
Top 10 HVAC contractors in San Anselmo at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Ongaro & Sons | 66 | 4.9★ (762) | San Anselmo | 24/7 | Overall |
| 2 | Bellows Plumbing, Heating, Cooling & Electrical | 63 | 4.9★ (480) | Novato, 7 mi away | 24/7 | Emergencies |
| 3 | Albert Nahman Plumbing, Heating, and Cooling | 62 | 4.7★ (3,311) | Berkeley, 18 mi away | 24/7 | Most reviews |
| 4 | Heise's Plumbing | 62 | 4.9★ (1,454) | San Francisco, 19 mi away | 24/7 | — |
| 5 | Local Plumbing | 62 | 5.0★ (211) | Sausalito, 9 mi away | 24/7 | — |
| 6 | Cabrillo Plumbing, Heating & Air | 62 | 4.9★ (966) | San Francisco, 18 mi away | 24/7 | — |
| 7 | Peter Levi Plumbing, Heating, Cooling, Drains | 62 | 4.8★ (1,640) | Novato, 7 mi away | Sat · Evenings | — |
| 8 | Magic Plumbing Heating & Cooling | 61 | 4.9★ (1,876) | San Francisco, 20 mi away | Sat · Sun · Evenings | — |
| 9 | Elevated Comfort | 60 | 5.0★ (90) | San Rafael, 3 mi away | Sat · Sun · Evenings | — |
| 10 | Ongaro & Sons | 60 | 4.9★ (538) | Petaluma, 20 mi away | 24/7 | — |
The 264 best HVAC contractors in San Anselmo, ranked
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.
Based in Novato, 7 mi away
63/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 480 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.9★ from 480 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 86 Hamilton Dr Suite A, Novato, CA 94949
Based in Berkeley, 18 mi away
62/100CR ScoreRanked #3 because of its Google rating and review volume: 4.7★ from 3,311 Google reviews, the most in San Anselmo.
- 4.7★ from 3,311 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3333 Martin Luther King Jr Way, Berkeley, CA 94703
Based in San Francisco, 19 mi away
62/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 1,454 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,454 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 260 Ocean Ave, San Francisco, CA 94112
Based in Sausalito, 9 mi away
62/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 211 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 211 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 323 Pine St Ste. F, Sausalito, CA 94965
Based in San Francisco, 18 mi away
62/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 966 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 966 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 78 Dorman Ave, San Francisco, CA 94124
Based in Novato, 7 mi away
62/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 1,640 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.8★ from 1,640 Google reviews
- Hours
- Mon–Fri 7 AM–7:30 PM · Sat 7:30 AM–4 PM · Sun closed
- Address
- 24 Digital Dr STE 1, Novato, CA 94949
Based in San Francisco, 20 mi away
61/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 1,876 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,876 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 1455 Bancroft Ave, San Francisco, CA 94124
Based in San Rafael, 3 mi away
60/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 90 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 90 Google reviews
- Hours
- Mon–Sat 7 AM–8 PM · Sun 8 AM–8 PM
- Address
- 1105 Francisco Blvd E #4, San Rafael, CA 94901
#10 Ongaro & Sons
Based in Petaluma, 20 mi away
60/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.9★ from 538 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 538 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 719 Southpoint Blvd, Petaluma, CA 94954
Based in San Francisco, 18 mi away
60/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 286 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 286 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 121 Quint St STE 5E, San Francisco, CA 94124
Based in Albany, 11 mi away
60/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 62 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 62 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
#13 Fuse Service
Based in Richmond, 13 mi away
59/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 94 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 94 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 173 Lakeshore Ct, Richmond, CA 94804
Based in Novato, 7 mi away
59/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.9★ from 588 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 588 Google reviews
- Hours
- Mon–Fri 7 AM–5 PM · Sat–Sun closed
- Address
- 14 Commercial Blvd #133, Novato, CA 94949
Based in San Francisco, 15 mi away
58/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.9★ from 69 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 69 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1725 Montgomery St, San Francisco, CA 94111
Based in San Francisco, 17 mi away
58/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.8★ from 333 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 333 Google reviews
- Hours
- Mon–Fri 8 AM–8 PM · Sat–Sun 8 AM–6 PM
- Address
- 1 Henry Adams St unit S324, San Francisco, CA 94103
Based in El Cerrito, 14 mi away
58/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 418 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 418 Google reviews
- Hours
- Mon–Thu 7:30 AM–9 PM · Fri 7:30 AM–7 PM · Sat 8 AM–4:30 PM · Sun closed
- Address
- 1537 S 56th St, El Cerrito, CA 94530
Based in Benicia, 24 mi away
58/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.8★ from 1,142 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 1,142 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 361 W Channel Rd, Benicia, CA 94510
Based in San Francisco, 19 mi away
58/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 207 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 207 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 737 Lisbon St, San Francisco, CA 94112
Based in Fairfax, 2 mi away
58/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 17 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 17 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 18 Napa Ave, Fairfax, CA 94930
Based in Sausalito, 9 mi away
58/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 416 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 416 Google reviews
- Hours
- Mon–Fri 8 AM–4 PM · Sat–Sun closed
- Address
- 2000 Bridgeway, Sausalito, CA 94965
Based in Berkeley, 13 mi away
57/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 27 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Oakland, 18 mi away
57/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.9★ from 569 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 569 Google reviews
- Hours
- Mon–Fri 7:30 AM–5 PM · Sat 9 AM–12 PM · Sun closed
- Address
- 1451 32nd St, Oakland, CA 94608
Based in Petaluma, 21 mi away
57/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 82 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 82 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1317 Scott St, Petaluma, CA 94954
Based in San Rafael, 4 mi away
57/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.9★ from 54 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 54 Google reviews
- Hours
- Mon–Sat 8 AM–5 PM · Sun closed
- Address
- 1201 Andersen Dr STE J, San Rafael, CA 94901
HVAC contractors ranked #26 to #50
#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 264 ranked HVAC contractors here; the rest are on their profiles.
Also serving San Anselmo
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 |
|---|---|---|
| A.L.B HVAC refrigeration service | 4.7★ (12) | 20 mi |
| American Chiller Service, Inc. | 3.0★ (2) | 21 mi |
| ARASTEK Heating and Cooling , HVAC , Air Conditioning | 5.0★ (2) | 10 mi |
| BEST CHOICE HVAC, INC | 5.0★ (4) | 20 mi |
| Brothers Energy | 5.0★ (2) | 10 mi |
| California HVAC | 4.9★ (59) | 23 mi |
| Central Refrigeration Co | 4.2★ (5) | 22 mi |
| Creative Comfort Systems | 5.0★ (2) | 21 mi |
| Five Or Free Electrical Heating & Air Solutions | 4.8★ (219) | 20 mi |
| Icon Plumbing & Design | 4.0★ (4) | 2 mi |
| Ledesma Heating Air | 5.0★ (2) | 19 mi |
| Lower Hills Heating and Air Conditioning | 5.0★ (4) | 23 mi |
| North Cal Heating And Air | 5.0★ (2) | 10 mi |
| North Star Heating & Cooling | 5.0★ (2) | 10 mi |
| ON TIME HVAC SF | 4.0★ (8) | 24 mi |
| Quaweay Electric | 5.0★ (2) | 21 mi |
| Rising Design & Construction | 3.0★ (2) | 8 mi |
| Sears Heating and Air Conditioning | 3.0★ (2) | 14 mi |
| Severson Heating & Cooling | 4.9★ (46) | 22 mi |
| SOS PLUMBING, HEATING & AIR | 4.0★ (3) | 24 mi |
How much do HVAC contractors cost in San Anselmo?
National price ranges in USD, not adjusted for San Anselmo. 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 |
How to check an HVAC contractor's license in California
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).
- Search the business name or license number on the Contractors State License Board (CSLB) license lookup.
- Check that the status is active and the name matches the contract or truck.
- Ask for proof of insurance before work starts.
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
When to hire an HVAC contractor in California
California's HVAC demand peaks during summer heat waves and the first cold snaps. Spring and fall are the easiest times to book maintenance.
How we ranked San Anselmo HVAC contractors
We scored 264 San Anselmo 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 San Anselmo 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 |
HVAC contractors in San Anselmo: frequently asked questions
Who is the best HVAC contractor in San Anselmo?
By CR Score, the highest-ranked HVAC contractor in San Anselmo, CA is Ongaro & Sons with a CR Score of 66/100. It has 4.9★ from 762 Google reviews. It is open 24/7. Bellows Plumbing, Heating, Cooling & Electrical (#2) and Albert Nahman Plumbing, Heating, and Cooling (#3) follow. We ranked 264 HVAC contractors on ten factors, last updated October 22, 2026.
How many HVAC contractors are there in San Anselmo?
ContractorsRanked ranks 264 HVAC contractors serving San Anselmo, CA. 1 of them is based in San Anselmo; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in San Anselmo are open 24/7?
50 ranked HVAC contractors in San Anselmo post 24/7 hours. The highest-ranked are Ongaro & Sons (#1), Bellows Plumbing, Heating, Cooling & Electrical (#2) and Albert Nahman Plumbing, Heating, and Cooling (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in San Anselmo work on weekends?
160 of 264 ranked HVAC contractors post Saturday hours and 131 post Sunday hours. The highest-ranked open Saturdays are Ongaro & Sons (#1), Bellows Plumbing, Heating, Cooling & Electrical (#2) and Albert Nahman Plumbing, Heating, and Cooling (#3). Posted hours are office hours; crews may book weekend jobs separately.
How do I check an HVAC contractor's license in California?
In California, Contractors State License Board (CSLB) handles licensing and covers C-20 Warm-Air Heating, Ventilating and Air-Conditioning contractor license. Search the business or license number at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx. Jobs of $1,000 or more in labor and materials (from January 1, 2025).
How much does ac replacement cost in San Anselmo?
AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for San Anselmo. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do San Anselmo HVAC contractors have?
The median Google rating among 264 rated HVAC contractors in San Anselmo is 4.9★, with a median of 14 reviews. Albert Nahman Plumbing, Heating, and Cooling has the most, 3,311 reviews, and ranks #3. We adjust ratings for review count, so a few five-star reviews cannot top the list.
When is the best time to hire an HVAC contractor in San Anselmo?
California's HVAC demand peaks during summer heat waves and the first cold snaps. Spring and fall are the easiest times to book maintenance.
Update log for San Anselmo
- October 2026: CR Scores recalculated for 264 hvac contractors serving San Anselmo.
- October 2026: 2 duplicate listings merged.
More HVAC contractors and San Anselmo pages
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