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Emergency HVAC Contractors in San Anselmo, CA (2026)

Top 50 of 264 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

25 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

If you smell gas, leave the building now and call your gas utility or 911 from outside.

The short answer

  1. 1

    #1 for emergency heating and cooling in San Anselmo: Ongaro & Sons, open 24/7.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

Top emergency HVAC contractors in San Anselmo at a glance

Top emergency HVAC contractors in San Anselmo at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Ongaro & Sons664.9★ (762)San Anselmo24/7
2Bellows Plumbing, Heating, Cooling & Electrical644.9★ (480)Novato, 7 mi away24/7
3Albert Nahman Plumbing, Heating, and Cooling634.7★ (3,311)Berkeley, 18 mi away24/7
4Heise's Plumbing634.9★ (1,454)San Francisco, 19 mi away24/7
5Local Plumbing625.0★ (211)Sausalito, 9 mi away24/7
6Cabrillo Plumbing, Heating & Air624.9★ (966)San Francisco, 18 mi away24/7
7Ongaro & Sons614.9★ (538)Petaluma, 20 mi away24/7
8Arch Plumbing Inc.604.9★ (286)San Francisco, 18 mi away24/7
9Temescal AC Repair605.0★ (62)Albany, 11 mi away24/7
10Fuse Service604.9★ (94)Richmond, 13 mi away24/7

Call an emergency HVAC contractor in San Anselmo now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency HVAC contractors in San Anselmo, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 264 is on the HVAC contractors page.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  1. Ranked #1 in San Anselmo

    #1 Ongaro & Sons

    Based in San Anselmo

    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
    View profile for Ongaro & Sons(415) 523-3755

  4. #4 Heise's Plumbing

    Based in San Francisco, 19 mi away

    63/100CR Score

    Ranked #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
    View profile for Heise's Plumbing(415) 333-0704

  5. #5 Local Plumbing

    Based in Sausalito, 9 mi away

    62/100CR Score

    Ranked #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
    View profile for Local Plumbing(415) 636-9210

  7. #7 Ongaro & Sons

    Based in Petaluma, 20 mi away

    61/100CR Score

    Ranked #7 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
    View profile for Ongaro & Sons(707) 633-9499

  8. #8 Arch Plumbing Inc.

    Based in San Francisco, 18 mi away

    60/100CR Score

    Ranked #8 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
    View profile for Arch Plumbing Inc.(415) 325-2547

  10. #10 Fuse Service

    Based in Richmond, 13 mi away

    60/100CR Score

    Ranked #10 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
    View profile for Fuse Service(415) 234-1807

  15. #15 Milano Mechanical

    Based in Petaluma, 21 mi away

    58/100CR Score

    Ranked #15 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
    View profile for Milano Mechanical(707) 778-9339

  17. #17 1-888-Heat-Pumps

    Based in Berkeley, 18 mi away

    57/100CR Score

    Ranked #17 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 45 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1826 Prince St, Berkeley, CA 94703
    View profile for 1-888-Heat-Pumps(888) 432-8786

  24. #24 Afterglow

    Based in Albany, 22 mi away

    56/100CR Score

    Ranked #24 because of its Google rating and trade focus: 4.9★ from 47 Google reviews, listed on Google as “Heating contractor”.

    • 4.9★ from 47 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Afterglow(510) 495-0550

  25. #25 California HVAC

    Based in Oakland, 23 mi away

    56/100CR Score

    Ranked #25 because of its Google rating and trade focus: 4.9★ from 59 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 59 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1445 34th Ave Unit 7213, Oakland, CA 94601
    View profile for California HVAC(510) 616-9857

Top 50 of 264 HVAC contractors by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

HVAC contractors in San Anselmo, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Severson Heating & Cooling564.9★ (46)22 mi
27Estes Refrigeration, Inc.564.0★ (10)12 mi
28Palma Super Cold HVAC565.0★ (8)14 mi
29Climate Services Heating and Air Conditioning555.0★ (19)21 mi
30Five Or Free Electrical Heating & Air Solutions554.8★ (219)20 mi
31A.L.B HVAC refrigeration service544.7★ (12)20 mi
32West Coast Refrigeration LLC545.0★ (4)16 mi
33Anchor Heating & Cooling, Inc.544.3★ (16)23 mi
34BV Mechanical Services LLC.545.0★ (5)19 mi
35Big Blue Plumbing544.7★ (575)21 mi
36BEST CHOICE HVAC, INC535.0★ (4)20 mi
37Dormatech Mechanical Systems, Inc.533.4★ (5)20 mi
38Arctic HVAC and Constructions LLC535.0★ (4)21 mi
39Central Refrigeration Co534.2★ (5)22 mi
40Excelsior Heating & Cooling535.0★ (4)21 mi
41O'Keeffe Mechanical Co Inc533.0★ (3)18 mi
42Lower Hills Heating and Air Conditioning525.0★ (4)23 mi
43ON TIME HVAC SF524.0★ (8)24 mi
44Brandon Heating AC & Sheet Metal521.5★ (26)19 mi
45SOS PLUMBING, HEATING & AIR524.0★ (3)24 mi
46Twin Peaks Service | Plumbing Electrical Air Conditioning Repair Water Heater Repair & Air Duct Cleaning514.8★ (11)18 mi
47Galaxy Heating & Air Conditioning515.0★ (6)15 mi
48Icon Plumbing & Design514.0★ (4)2 mi
49Flow Elite Plumbing & Hydronic Heating515.0★ (21)24 mi
50AquaSaver Water Heaters475.0★ (5)20 mi

How we ranked emergency HVAC contractors in San Anselmo

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency HVAC contractors in San Anselmo: questions

Which HVAC contractors in San Anselmo are open 24/7?

25 on this list post 24/7 hours, including Ongaro & Sons, Bellows Plumbing, Heating, Cooling & Electrical, Albert Nahman Plumbing, Heating, and Cooling, Heise's Plumbing and Local Plumbing.

Who is ranked #1 for emergency heating and cooling in San Anselmo, CA?

Ongaro & Sons is #1, with a CR Score of 66 out of 100 on emergency weights.

How are emergency HVAC contractors in San Anselmo ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the HVAC contractor arrives?

If you smell gas, leave the building now and call your gas utility or 911 from outside.

How many emergency HVAC contractors here list a phone number?

25 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for San Anselmo

  1. October 2026: CR Scores recalculated for 264 hvac contractors serving San Anselmo.
  2. October 2026: 2 duplicate listings merged.

More emergency and heating and cooling pages