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Emergency HVAC Contractors in Sunnyvale, CA (2026)

Top 50 of 480 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 Sunnyvale: Service Champions, 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 Sunnyvale at a glance

Top emergency HVAC contractors in Sunnyvale at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Service Champions664.9★ (3,407)San Jose, 8 mi away24/7
2Fuse HVAC, Refrigeration, Electrical & Plumbing654.9★ (1,034)Santa Clara, 5 mi away24/7
3IRBIS Air Plumbing Electrical654.9★ (1,466)San Jose, 8 mi away24/7
4Same Day Air Conditioning & Heating644.7★ (550)Sunnyvale24/7
5TRIO Heating, Air & Plumbing644.9★ (1,142)San Jose, 7 mi away24/7
6Atlas Trillo644.6★ (1,308)San Jose, 7 mi away24/7
7Heating And Air Experts - Affordable HVAC Contractor in Fremont, California635.0★ (761)Fremont, 11 mi away24/7
8Fuse634.9★ (400)San Jose, 6 mi away24/7
9AIS Heating & Air Conditioning634.9★ (723)Fremont, 10 mi away24/7
10Fuse HVAC, Refrigeration, Electrical & Plumbing634.9★ (216)Mountain View, 3 mi away24/7

Call an emergency HVAC contractor in Sunnyvale 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 Sunnyvale, 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 480 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 Sunnyvale

    #1 Service Champions

    Based in San Jose, 8 mi away

    66/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.9★ from 3,407 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 3,407 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2161 Del Franco St, San Jose, CA 95131
    View profile for Service Champions(408) 549-7376

  6. #6 Atlas Trillo

    Based in San Jose, 7 mi away

    64/100CR Score

    Ranked #6 because of its Google rating and trade focus: 4.6★ from 1,308 Google reviews, listed on Google as “HVAC contractor”.

    • 4.6★ from 1,308 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2305 Paragon Dr, San Jose, CA 95131
    View profile for Atlas Trillo(408) 675-1924

  8. #8 Fuse

    Based in San Jose, 6 mi away

    63/100CR Score

    Ranked #8 because of its Google rating and trade focus: 4.9★ from 400 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 400 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2512 Seaboard Ave, San Jose, CA 95131
    View profile for Fuse(669) 240-1243

  11. #11 Fuse service

    Based in Palo Alto, 9 mi away

    63/100CR Score

    Ranked #11 because of its Google rating and trade focus: 5.0★ from 444 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 444 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    349 Everett Ave, Palo Alto, CA 94301
    View profile for Fuse service(408) 412-9334

  12. #12 ARS/ Rescue Rooter

    Based in San Jose, 7 mi away

    63/100CR Score

    Ranked #12 because of its Google rating and trade focus: 4.7★ from 546 Google reviews, listed on Google as “HVAC contractor”.

    • 4.7★ from 546 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2305 Paragon Dr, San Jose, CA 95131
    View profile for ARS/ Rescue Rooter(408) 620-3458

  13. #13 Fuse Service

    Based in Santa Clara, 6 mi away

    63/100CR Score

    Ranked #13 because of its Google rating and trade focus: 4.9★ from 273 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 273 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1221 Sherwood Ave, Santa Clara, CA 95050
    View profile for Fuse Service(408) 412-0203

  18. #18 HVAC Gurus

    Based in San Jose, 10 mi away

    62/100CR Score

    Ranked #18 because of its Google rating and trade focus: 4.7★ from 439 Google reviews, listed on Google as “HVAC contractor”.

    • 4.7★ from 439 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    75 Phelan Ave Unit 6, San Jose, CA 95112
    View profile for HVAC Gurus(408) 499-0494

  23. #23 Fuse Service

    Based in San Mateo, 9 mi away

    61/100CR Score

    Ranked #23 because of its Google rating and trade focus: 4.9★ from 217 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 217 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    3 37th Ave W, San Mateo, CA 94403
    View profile for Fuse Service(669) 240-1215

  25. #25 Best HVAC

    Based in Lodi, 7 mi away

    61/100CR Score

    Ranked #25 because of its Google rating and trade focus: 4.8★ from 153 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 153 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Best HVAC

Top 50 of 480 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 Sunnyvale, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Skyrocket HVAC & Appliance Repair615.0★ (124)8 mi
27Cabrillo Plumbing, Heating & Air615.0★ (208)12 mi
28Service Champions614.8★ (2,337)24 mi
29Golden Comfort AC & Heating Repair615.0★ (85)6 mi
30Haxx Heating, Air & Electrical614.9★ (108)7 mi
31R&R Refrigeration & Air Conditioning, Inc.615.0★ (142)10 mi
32Bellows Plumbing, Heating, Cooling & Electrical614.7★ (159)8 mi
33Bell Brothers Plumbing Heating & Air - Hayward614.7★ (863)18 mi
34Finest Heating & air604.9★ (87)7 mi
35Freon Service604.9★ (219)13 mi
36Silicon Valley Comfort604.9★ (134)11 mi
37Aire Serv of Campbell and Saratoga604.9★ (127)11 mi
38Around the Clock Service, Inc.604.5★ (34)In Sunnyvale
39Service Hero Plumbing & Air604.5★ (1,252)19 mi
40Expert Heating & Air Conditioning Mountain View CA605.0★ (34)3 mi
41EVS MECHANICAL INC605.0★ (36)5 mi
42Glover & Son Heating & Air Conditioning [Recommended] Bay Area AC Repair604.8★ (122)11 mi
43Same Day Air Conditioning & Heating604.5★ (700)18 mi
44Advanced Technical Hvac605.0★ (54)8 mi
45Tempro605.0★ (48)8 mi
46Fuse Service594.9★ (264)18 mi
47Green Mechanics Heating & AC Repair Specialists594.9★ (74)10 mi
48Mr. Reliable Plumbing & Heating594.7★ (55)7 mi
491st Heating And Cooling East Palo Alto595.0★ (46)9 mi
50Electric Air595.0★ (72)12 mi

How we ranked emergency HVAC contractors in Sunnyvale

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 Sunnyvale: questions

Which HVAC contractors in Sunnyvale are open 24/7?

25 on this list post 24/7 hours, including Service Champions, Fuse HVAC, Refrigeration, Electrical & Plumbing, IRBIS Air Plumbing Electrical, Same Day Air Conditioning & Heating and TRIO Heating, Air & Plumbing.

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

Service Champions is #1, with a CR Score of 66 out of 100 on emergency weights.

How are emergency HVAC contractors in Sunnyvale 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?

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

Update log for Sunnyvale

  1. October 2026: CR Scores recalculated for 480 hvac contractors serving Sunnyvale.
  2. October 2026: 4 duplicate listings merged.

More emergency and heating and cooling pages