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Emergency HVAC Contractors in Los Altos, CA (2026)

Top 50 of 498 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 Los Altos: 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 Los Altos at a glance

Top emergency HVAC contractors in Los Altos at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Service Champions654.9★ (3,407)San Jose, 12 mi away24/7
2Fuse HVAC, Refrigeration, Electrical & Plumbing644.9★ (1,034)Santa Clara, 9 mi away24/7
3Fuse service645.0★ (444)Palo Alto, 5 mi away24/7
4Same Day Air Conditioning & Heating644.7★ (550)Sunnyvale, 3 mi away24/7
5IRBIS Air Plumbing Electrical644.9★ (1,466)San Jose, 12 mi away24/7
6TRIO Heating, Air & Plumbing634.9★ (1,142)San Jose, 12 mi away24/7
7Fuse HVAC, Refrigeration, Electrical & Plumbing634.9★ (216)Mountain View, 3 mi away24/7
8Heating And Air Experts - Affordable HVAC Contractor in Fremont, California635.0★ (761)Fremont, 12 mi away24/7
9AIS Heating & Air Conditioning634.9★ (723)Fremont, 12 mi away24/7
10Atlas Trillo634.6★ (1,308)San Jose, 11 mi away24/7

Call an emergency HVAC contractor in Los Altos 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 Los Altos, 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 498 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 Los Altos

    #1 Service Champions

    Based in San Jose, 12 mi away

    65/100CR 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

  3. #3 Fuse service

    Based in Palo Alto, 5 mi away

    64/100CR Score

    Ranked #3 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

  10. #10 Atlas Trillo

    Based in San Jose, 11 mi away

    63/100CR Score

    Ranked #10 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

  11. #11 Fuse

    Based in San Jose, 10 mi away

    62/100CR Score

    Ranked #11 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

  15. #15 ARS/ Rescue Rooter

    Based in San Jose, 11 mi away

    62/100CR Score

    Ranked #15 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

  16. #16 Fuse Service

    Based in Santa Clara, 10 mi away

    61/100CR Score

    Ranked #16 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 Finest Heating & air

    Based in Palo Alto, 5 mi away

    61/100CR Score

    Ranked #18 because of its Google rating and trade focus: 4.9★ from 87 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 87 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2100 Geng Rd Suit 210, Palo Alto, CA 94303
    View profile for Finest Heating & air(650) 223-2028

  21. #21 Service Champions

    Based in Pleasanton, 24 mi away

    61/100CR Score

    Ranked #21 because of its Google rating and trade focus: 4.8★ from 2,337 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 2,337 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    7020 Commerce Dr, Pleasanton, CA 94588
    View profile for Service Champions(925) 248-3458

  25. #25 HVAC Gurus

    Based in San Jose, 14 mi away

    61/100CR Score

    Ranked #25 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

Top 50 of 498 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 Los Altos, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Service Hero Plumbing & Air614.5★ (1,252)18 mi
27Evergreen Air HVAC Corp605.0★ (115)10 mi
28Fuse Service604.9★ (264)14 mi
29Expert Heating & Air Conditioning Mountain View CA605.0★ (34)2 mi
30Trio Heating & Air Hayward605.0★ (148)12 mi
31Fuse Service604.9★ (217)14 mi
32Skyrocket HVAC & Appliance Repair605.0★ (124)12 mi
33Electric Air605.0★ (72)8 mi
34Best HVAC604.8★ (153)11 mi
35Same Day Air Conditioning & Heating604.5★ (700)16 mi
361st Heating And Cooling East Palo Alto605.0★ (46)6 mi
37Excellent Repair604.8★ (43)4 mi
38Superior HVAC Contractor Palo Alto605.0★ (31)4 mi
39Golden Comfort AC & Heating Repair605.0★ (85)11 mi
40Haxx Heating, Air & Electrical604.9★ (108)11 mi
41Trusted AC Repair Palo Alto605.0★ (36)5 mi
42Glover & Son Heating & Air Conditioning [Recommended] Bay Area AC Repair604.8★ (122)11 mi
43R&R Refrigeration & Air Conditioning, Inc.605.0★ (142)14 mi
44Bellows Plumbing, Heating, Cooling & Electrical604.7★ (159)12 mi
45Freon Service594.9★ (219)17 mi
46Silicon Valley Comfort594.9★ (134)15 mi
47Albert Nahman Plumbing, Heating, and Cooling594.6★ (474)19 mi
48Green Mechanics Heating & AC Repair Specialists594.9★ (74)11 mi
49Villquin Air Services594.9★ (172)17 mi
50Aire Serv of Campbell and Saratoga594.9★ (127)15 mi

How we ranked emergency HVAC contractors in Los Altos

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 Los Altos: questions

Which HVAC contractors in Los Altos are open 24/7?

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

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

Service Champions is #1, with a CR Score of 65 out of 100 on emergency weights.

How are emergency HVAC contractors in Los Altos 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 Los Altos

  1. October 2026: CR Scores recalculated for 498 hvac contractors serving Los Altos.
  2. October 2026: 5 duplicate listings merged.

More emergency and heating and cooling pages