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Emergency HVAC Contractors in Mill Valley, CA (2026)

Top 50 of 265 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 Mill Valley: 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 Mill Valley at a glance

Top emergency HVAC contractors in Mill Valley at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Ongaro & Sons654.9★ (762)San Anselmo, 5 mi away24/7
2Albert Nahman Plumbing, Heating, and Cooling644.7★ (3,311)Berkeley, 16 mi away24/7
3Heise's Plumbing644.9★ (1,454)San Francisco, 14 mi away24/7
4Local Plumbing635.0★ (211)Sausalito, 5 mi away24/7
5Cabrillo Plumbing, Heating & Air634.9★ (966)San Francisco, 14 mi away24/7
6Bellows Plumbing, Heating, Cooling & Electrical634.9★ (480)Novato, 12 mi away24/7
7Arch Plumbing Inc.614.9★ (286)San Francisco, 14 mi away24/7
8Temescal AC Repair615.0★ (62)Albany, 7 mi away24/7
9Fuse Service604.9★ (94)Richmond, 11 mi away24/7
10Sugar Bear Home Services604.9★ (369)South San Francisco, 20 mi away24/7

Call an emergency HVAC contractor in Mill Valley 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 Mill Valley, 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 265 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 Mill Valley

    #1 Ongaro & Sons

    Based in San Anselmo, 5 mi away

    65/100CR 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

  3. #3 Heise's Plumbing

    Based in San Francisco, 14 mi away

    64/100CR Score

    Ranked #3 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

  4. #4 Local Plumbing

    Based in Sausalito, 5 mi away

    63/100CR Score

    Ranked #4 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 Arch Plumbing Inc.

    Based in San Francisco, 14 mi away

    61/100CR Score

    Ranked #7 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

  9. #9 Fuse Service

    Based in Richmond, 11 mi away

    60/100CR Score

    Ranked #9 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

  12. #12 Ongaro & Sons

    Based in Petaluma, 25 mi away

    59/100CR Score

    Ranked #12 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

  16. #16 1-888-Heat-Pumps

    Based in Berkeley, 15 mi away

    58/100CR Score

    Ranked #16 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

  20. #20 Afterglow

    Based in Albany, 18 mi away

    57/100CR Score

    Ranked #20 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

  22. #22 California HVAC

    Based in Oakland, 20 mi away

    57/100CR Score

    Ranked #22 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 265 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 Mill Valley, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Palma Super Cold HVAC565.0★ (8)12 mi
27Southgate HVAC Solutions565.0★ (28)21 mi
28Five Or Free Electrical Heating & Air Solutions564.8★ (219)17 mi
29Martin Electric and HVAC555.0★ (30)24 mi
30West Coast Refrigeration LLC555.0★ (4)11 mi
31A.L.B HVAC refrigeration service554.7★ (12)17 mi
32Anchor Heating & Cooling, Inc.554.3★ (16)19 mi
33BEST CHOICE HVAC, INC545.0★ (4)15 mi
34Big Blue Plumbing544.7★ (575)17 mi
35BV Mechanical Services LLC.545.0★ (5)18 mi
36Central Refrigeration Co544.2★ (5)17 mi
37O'Keeffe Mechanical Co Inc543.0★ (3)14 mi
38Arctic HVAC and Constructions LLC545.0★ (4)18 mi
39ON TIME HVAC SF544.0★ (8)20 mi
40Lower Hills Heating and Air Conditioning535.0★ (4)20 mi
41Brandon Heating AC & Sheet Metal531.5★ (26)15 mi
42Dormatech Mechanical Systems, Inc.533.4★ (5)22 mi
43Twin Peaks Service | Plumbing Electrical Air Conditioning Repair Water Heater Repair & Air Duct Cleaning524.8★ (11)13 mi
44Galaxy Heating & Air Conditioning525.0★ (6)11 mi
45Seaside Refrigeration / HVAC524.2★ (5)24 mi
46Ehret Co Plumbing & Heating524.6★ (52)22 mi
47American Chiller Service, Inc.524.2★ (5)25 mi
48McHale's Heating Air525.0★ (3)24 mi
49Icon Plumbing & Design504.0★ (4)6 mi
50Gladiator Rooter and Plumbing504.6★ (90)24 mi

How we ranked emergency HVAC contractors in Mill Valley

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 Mill Valley: questions

Which HVAC contractors in Mill Valley are open 24/7?

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

Who is ranked #1 for emergency heating and cooling in Mill Valley, CA?

Ongaro & Sons is #1, with a CR Score of 65 out of 100 on emergency weights.

How are emergency HVAC contractors in Mill Valley 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 Mill Valley

  1. October 2026: CR Scores recalculated for 265 hvac contractors serving Mill Valley.
  2. October 2026: 3 duplicate listings merged.

More emergency and heating and cooling pages