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Best HVAC Contractors in Foster City, CA (2026)

538 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Foster City: Fuse Service, CR Score 64/100; 4.9★ from 264 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Fuse service, posts 24/7 hours; ranked #2 of 538.

  3. 8

    Most-reviewed: Jazz Heating, Air Conditioning and Plumbing, 3,438 Google reviews at 4.9★, the most of 538 ranked; ranked #8.

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

538 Foster City HVAC contractors are ranked here by CR Score, from ten published factors. 148 are open 24/7, 358 open Saturdays and 295 open Sundays, based on posted hours. The median Google rating is 4.9★ across 538 rated businesses.

Top 10 HVAC contractors in Foster City at a glance

Top 10 HVAC contractors in Foster City at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Fuse Service644.9★ (264)San Mateo, 2 mi away24/7Overall
2Fuse service635.0★ (444)Palo Alto, 10 mi away24/7Emergencies
3Heise's Plumbing634.9★ (1,454)San Francisco, 15 mi away24/7—
4Cabrillo Plumbing, Heating & Air635.0★ (208)Menlo Park, 7 mi away24/7—
5Cabrillo Plumbing, Heating & Air634.9★ (966)San Francisco, 15 mi away24/7—
6Bell Brothers Plumbing Heating & Air - Hayward624.7★ (863)Hayward, 10 mi away24/7—
7Magic Plumbing Heating & Cooling624.9★ (1,876)San Francisco, 13 mi awaySat · Sun · Evenings—
8Jazz Heating, Air Conditioning and Plumbing624.9★ (3,438)Pleasanton, 23 mi away24/7Most reviews
9Service Champions624.9★ (3,407)San Jose, 23 mi away24/7—
10Green Mechanics Heating & AC Repair Specialists624.9★ (74)Foster City24/7—

The 538 best HVAC contractors in Foster City, ranked

Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.

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 Foster City

    #1 Fuse Service

    Based in San Mateo, 2 mi away

    64/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.9★ from 264 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 264 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    3 37th Ave, San Mateo, CA 94403
    View profile for Fuse Service(408) 702-2554

  2. #2 Fuse service

    Based in Palo Alto, 10 mi away

    63/100CR Score

    Ranked #2 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

  3. #3 Heise's Plumbing

    Based in San Francisco, 15 mi away

    63/100CR 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

  9. #9 Service Champions

    Based in San Jose, 23 mi away

    62/100CR Score

    Ranked #9 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

  14. #14 Service Champions

    Based in Pleasanton, 22 mi away

    62/100CR Score

    Ranked #14 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

  19. #19 Villquin Air Services

    Based in Hayward, 10 mi away

    61/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 172 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    27343 Industrial Blvd Suite H, Hayward, CA 94545
    View profile for Villquin Air Services(510) 405-1580

  21. #21 Electric Air

    Based in Redwood City, 7 mi away

    61/100CR Score

    Ranked #21 because of its Google rating and trade focus: 5.0★ from 72 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 72 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2684 Middlefield Rd Unit D, Redwood City, CA 94063
    View profile for Electric Air(650) 670-4860

  25. #25 Arch Plumbing Inc.

    Based in San Francisco, 15 mi away

    61/100CR Score

    Ranked #25 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

HVAC contractors ranked #26 to #50

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 538 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Foster City, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26TRIO Heating, Air & Plumbing604.9★ (1,142)24 mi
27TRIO Heating, Air & Plumbing604.9★ (145)11 mi
28Belmont HVAC Pro604.7★ (75)4 mi
29Pacific Coast Home Services604.5★ (86)2 mi
30Rooter Hero Plumbing & Air of San Lorenzo604.7★ (265)12 mi
31Fuse HVAC, Refrigeration, Electrical & Plumbing604.9★ (216)16 mi
32Nur HVAC605.0★ (364)15 mi
33Same Day Air Conditioning & Heating604.7★ (550)17 mi
34Finest Heating & air604.9★ (87)11 mi
35Comfy Heating & Air Conditioning594.9★ (602)24 mi
36Comfy Heating & Air Conditioning Inc.594.8★ (111)12 mi
37HVAC Redwood City595.0★ (33)7 mi
381st Heating And Cooling East Palo Alto595.0★ (46)9 mi
39Fuse594.9★ (400)22 mi
40Glover & Son Heating & Air Conditioning [Recommended] Bay Area AC Repair594.8★ (122)13 mi
41Atlas Trillo594.6★ (1,308)23 mi
42Eco Air Cooling and Heating595.0★ (28)7 mi
43Alaska Refrigeration Air Conditioning & Heating Co594.9★ (130)17 mi
44Trusted AC Repair Palo Alto595.0★ (36)10 mi
45ARS/ Rescue Rooter584.7★ (546)23 mi
46Fuse Service584.9★ (273)24 mi
47Local Plumbing585.0★ (211)24 mi
48Excellent Repair584.8★ (43)11 mi
49The Clean Sky HVAC and Appliance Repair585.0★ (37)12 mi
50Art of Comfort585.0★ (153)24 mi

Also serving Foster City

20 more HVAC contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.

Unranked HVAC contractors serving Foster City
BusinessGoogle ratingDistance
AirNova HVAC SystemsIn Foster City
Automatic Control Engineering4.5★ (2)11 mi
Bayside Heating & Air Conditioning, Inc.5.0★ (2)2 mi
C F Archibald Paving5.0★ (2)7 mi
Commercial Filter Services3.0★ (2)11 mi
Cosmos Electric Co3.0★ (2)13 mi
Furnace Man5.0★ (2)7 mi
Hayward duct cleaning & dryer solution5.0★ (2)10 mi
Heating & Air Conditioning5.0★ (2)3 mi
Insulation & Air Duct Crew5.0★ (2)12 mi
Janal Heating & Air Conditioning5.0★ (2)6 mi
Panda Heating & Cooling3.5★ (2)13 mi
Phil Finer Refrigeration & AC2.0★ (2)3 mi
Restart HVAC & Electrical5.0★ (2)2 mi
RJA Group LLC3.0★ (2)14 mi
Ron Williams Plumbing & Heating4.0★ (2)5 mi
Roofsky Air Duct Cleaning Service5.0★ (17)7 mi
Silicon Valley Air Systems, IncIn Foster City
Techpro Heating & Cooling4.8★ (60)3 mi
Water Heater Specialists4.9★ (350)In Foster City

How much do HVAC contractors cost in Foster City?

National price ranges in USD, not adjusted for Foster City. Each row names its basis and the month we checked it.

How much do HVAC contractors cost in Foster City?
JobLowTypicalHighBasisChecked
AC replacement$3,887$5,978$8,073Per system, installed (unit plus labor); typical range of customer-reported jobs. US national rangeOctober 2026
Furnace replacement$2,823$4,814$6,896Per system, installed; typical range of customer-reported jobs. US national rangeOctober 2026

How to check an HVAC contractor's license in California

In California, Contractors State License Board (CSLB) licenses C-20 Warm-Air Heating, Ventilating and Air-Conditioning contractor license.

Jobs of $1,000 or more in labor and materials (from January 1, 2025).

  1. Search the business name or license number on the Contractors State License Board (CSLB) license lookup.
  2. Check that the status is active and the name matches the contract or truck.
  3. Ask for proof of insurance before work starts.

No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.

Guide checked October 2026. How we verify licenses

When to hire an HVAC contractor in California

California's HVAC demand peaks during summer heat waves and the first cold snaps. Spring and fall are the easiest times to book maintenance.

How we ranked Foster City HVAC contractors

We scored 538 Foster City HVAC contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.

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 fromIn Foster City data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

HVAC contractors in Foster City: frequently asked questions

Who is the best HVAC contractor in Foster City?

By CR Score, the highest-ranked HVAC contractor in Foster City, CA is Fuse Service with a CR Score of 64/100. It has 4.9★ from 264 Google reviews. It is open 24/7. Fuse service (#2) and Heise's Plumbing (#3) follow. We ranked 538 HVAC contractors on ten factors, last updated October 22, 2026.

How many HVAC contractors are there in Foster City?

ContractorsRanked ranks 538 HVAC contractors serving Foster City, CA. 1 of them is based in Foster City; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which HVAC contractors in Foster City are open 24/7?

148 ranked HVAC contractors in Foster City post 24/7 hours. The highest-ranked are Fuse Service (#1), Fuse service (#2) and Heise's Plumbing (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Foster City work on weekends?

358 of 538 ranked HVAC contractors post Saturday hours and 295 post Sunday hours. The highest-ranked open Saturdays are Fuse Service (#1), Fuse service (#2) and Heise's Plumbing (#3). Posted hours are office hours; crews may book weekend jobs separately.

How do I check an HVAC contractor's license in California?

In California, Contractors State License Board (CSLB) handles licensing and covers C-20 Warm-Air Heating, Ventilating and Air-Conditioning contractor license. Search the business or license number at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx. Jobs of $1,000 or more in labor and materials (from January 1, 2025).

How much does ac replacement cost in Foster City?

AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Foster City. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Foster City HVAC contractors have?

The median Google rating among 538 rated HVAC contractors in Foster City is 4.9★, with a median of 18 reviews. Jazz Heating, Air Conditioning and Plumbing has the most, 3,438 reviews, and ranks #8. We adjust ratings for review count, so a few five-star reviews cannot top the list.

When is the best time to hire an HVAC contractor in Foster City?

California's HVAC demand peaks during summer heat waves and the first cold snaps. Spring and fall are the easiest times to book maintenance.

Update log for Foster City

  1. October 2026: CR Scores recalculated for 538 hvac contractors serving Foster City.
  2. October 2026: 6 duplicate listings merged.

More HVAC contractors and Foster City pages

Other trades in Foster City