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Emergency HVAC Contractors in Saint Helena, CA (2026)

Top 50 of 107 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

21 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 Saint Helena: 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 Saint Helena at a glance

Top emergency HVAC contractors in Saint Helena at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Ongaro & Sons644.9★ (1,222)Santa Rosa, 14 mi away24/7
2KC Home Services Plumbing, Heating & AC Repair644.9★ (827)Santa Rosa, 15 mi away24/7
3Henry Mechanical635.0★ (866)Windsor, 18 mi away24/7
4Bragg Home Services634.9★ (486)Santa Rosa, 15 mi away24/7
5Next Day Air & Heating625.0★ (499)Cotati, 18 mi away24/7
6Same Day Heating, Cooling, Plumbing624.9★ (531)Windsor, 18 mi away24/7
7Ongaro & Sons624.9★ (538)Petaluma, 20 mi away24/7
8Stout's Heating & AC, Inc604.8★ (99)Santa Rosa, 14 mi away24/7
9The Duct Doctor605.0★ (84)Santa Rosa, 15 mi away24/7
10Milano Mechanical595.0★ (82)Petaluma, 19 mi away24/7

Call an emergency HVAC contractor in Saint Helena 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 Saint Helena, 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 107 is on the HVAC contractors page.

  1. Ranked #1 in Saint Helena

    #1 Ongaro & Sons

    Based in Santa Rosa, 14 mi away

    64/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.9★ from 1,222 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 1,222 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    250 D St Suite 700B, Santa Rosa, CA 95404
    View profile for Ongaro & Sons(707) 908-9208

  3. #3 Henry Mechanical

    Based in Windsor, 18 mi away

    63/100CR Score

    Ranked #3 because of its Google rating and trade focus: 5.0★ from 866 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 866 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    7656 Bell Rd, Windsor, CA 95492
    View profile for Henry Mechanical(707) 585-1787

  4. #4 Bragg Home Services

    Based in Santa Rosa, 15 mi away

    63/100CR Score

    Ranked #4 because of its Google rating and trade focus: 4.9★ from 486 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 486 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    3345 Industrial Dr STE 16, Santa Rosa, CA 95403
    View profile for Bragg Home Services(707) 639-1746

  5. #5 Next Day Air & Heating

    Based in Cotati, 18 mi away

    62/100CR Score

    Ranked #5 because of its Google rating and trade focus: 5.0★ from 499 Google reviews, listed on Google as “Heating contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 499 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    651 Portal St #6, Cotati, CA 94931
    View profile for Next Day Air & Heating(707) 600-6986

  7. #7 Ongaro & Sons

    Based in Petaluma, 20 mi away

    62/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.9★ from 538 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 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 Stout's Heating & AC, Inc

    Based in Santa Rosa, 14 mi away

    60/100CR Score

    Ranked #8 because of its Google rating and trade focus: 4.8★ from 99 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.8★ from 99 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    840 Piner Rd STE 14, Santa Rosa, CA 95403
    View profile for Stout's Heating & AC, Inc(707) 527-1504

  9. #9 The Duct Doctor

    Based in Santa Rosa, 15 mi away

    60/100CR Score

    Ranked #9 because of its Google rating and trade focus: 5.0★ from 84 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 84 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    720 Blossom Way, Santa Rosa, CA 95401
    View profile for The Duct Doctor(707) 490-2722

  10. #10 Milano Mechanical

    Based in Petaluma, 19 mi away

    59/100CR Score

    Ranked #10 because of its Google rating and trade focus: 5.0★ from 82 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 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

  11. #11 Severson Heating & Cooling

    Based in Sonoma, 15 mi away

    59/100CR Score

    Ranked #11 because of its Google rating and trade focus: 4.9★ from 46 Google reviews, listed on Google as “Heating contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 46 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    19260 Wyatt Rd, Sonoma, CA 95476
    View profile for Severson Heating & Cooling(707) 938-3929

  12. #12 Northbay Comfort Inc.

    Based in Rohnert Park, 17 mi away

    58/100CR Score

    Ranked #12 because of its Google rating and trade focus: 5.0★ from 44 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 44 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    5701 State Farm Dr #9, Rohnert Park, CA 94928
    View profile for Northbay Comfort Inc.(707) 723-6182

  14. #14 Martin Electric and HVAC

    Based in Petaluma, 21 mi away

    57/100CR Score

    Ranked #14 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 30 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    Water St, Petaluma, CA 94952
    View profile for Martin Electric and HVAC(415) 699-4040

  18. #18 Excelsior Heating & Cooling

    Based in Sonoma, 16 mi away

    55/100CR Score

    Ranked #18 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 4 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    20549 Broadway, Sonoma, CA 95476
    View profile for Excelsior Heating & Cooling(707) 696-3053

  20. #20 Climate Pro Services

    Based in Santa Rosa, 15 mi away

    54/100CR Score

    Ranked #20 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 3 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1780 Piner Rd, Santa Rosa, CA 95403
    View profile for Climate Pro Services(707) 581-1534

  21. #21 STAT Heating & Air

    Based in Larkfield-Wikiup, 23 mi away

    52/100CR Score

    Ranked #21 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 3 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for STAT Heating & Air(707) 755-0518

  22. #22 CFM HVAC

    Based in Petaluma, 19 mi away

    48/100CR Score

    Ranked #22 because of its Google rating and trade focus: 5.0★ from 39 Google reviews, listed on Google as “Air conditioning contractor”.

    Based on 7 of 10 factors; credentials, recency and availability not yet collected.

    • 5.0★ from 39 Google reviews
    Address
    1364 N McDowell Blvd Suite 5, Petaluma, CA 94954
    View profile for CFM HVAC(707) 775-8117

  23. #23 Optemo Hydronics

    Based in Santa Rosa, 14 mi away

    47/100CR Score

    Ranked #23 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Heating contractor”.

    Based on 7 of 10 factors; credentials, recency and availability not yet collected.

    • 5.0★ from 18 Google reviews
    Address
    332 Carrillo St, Santa Rosa, CA 95401
    View profile for Optemo Hydronics(707) 292-3400

Top 50 of 107 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 Saint Helena, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Denny's Heating & Air Conditioning455.0★ (8)17 mi
27Roy Mechanical Services Inc453.6★ (7)15 mi
28Elevated Comfort444.9★ (949)18 mi
29Zero Energy Associates445.0★ (9)20 mi
30Fuse HVAC & Appliance Repair Napa444.8★ (912)18 mi
31Elevated Comfort434.9★ (320)15 mi
32John Owens Services, Inc.434.9★ (342)16 mi
33Ross HVAC And Appliance Service434.9★ (404)17 mi
34Sonoma County Comfort Heating and Air435.0★ (9)24 mi
35Enviro Heating & Air Conditioning Inc434.9★ (343)16 mi
36AdamEck HVAC, Inc434.9★ (111)10 mi
37North HVAC Services, Inc Heating & Air Conditioning425.0★ (240)20 mi
38Apes Plumbing Heating Sewer and Drain Services414.9★ (90)14 mi
39North End Plumbing, Heating & Air415.0★ (86)15 mi
40HP Mechanical415.0★ (123)19 mi
41Valley Comfort Heating and Air414.7★ (93)14 mi
42Fuse service: HVAC, Electrical & Appliance415.0★ (45)12 mi
43Cherry Hill Plumbing & Heating405.0★ (65)16 mi
44Warming Trends Inc.404.4★ (96)14 mi
45Core Heating & Air Conditioning405.0★ (76)19 mi
46John Owens Services, Inc.404.9★ (88)19 mi
47Boden Plumbing Heating & Air404.6★ (72)16 mi
48Mountain House Mechanical405.0★ (52)17 mi
49Hulbert Heating & Air Conditioning Inc405.0★ (54)18 mi
50Bell Products394.6★ (59)16 mi

How we ranked emergency HVAC contractors in Saint Helena

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 Saint Helena: questions

Which HVAC contractors in Saint Helena are open 24/7?

21 on this list post 24/7 hours, including Ongaro & Sons, KC Home Services Plumbing, Heating & AC Repair, Henry Mechanical, Bragg Home Services and Next Day Air & Heating.

Who is ranked #1 for emergency heating and cooling in Saint Helena, CA?

Ongaro & Sons is #1, with a CR Score of 64 out of 100 on emergency weights.

How are emergency HVAC contractors in Saint Helena 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 Saint Helena

  1. October 2026: CR Scores recalculated for 107 hvac contractors serving Saint Helena.
  2. October 2026: 2 duplicate listings merged.

More emergency and heating and cooling pages