498 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Los Altos: Service Champions, CR Score 65/100; 4.9★ from 3,407 Google reviews; open 24/7.
Best for emergencies (open 24/7): Fuse service, posts 24/7 hours; ranked #2 of 498.
Most-reviewed: Jazz Heating, Air Conditioning and Plumbing, 3,438 Google reviews at 4.9★, the most of 498 ranked; ranked #16.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
498 Los Altos HVAC contractors are ranked here by CR Score, from ten published factors. 141 are open 24/7, 331 open Saturdays and 269 open Sundays, based on posted hours. The median Google rating is 4.9★ across 498 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Service Champions | 65 | 4.9★ (3,407) | San Jose, 12 mi away | 24/7 | Overall |
| 2 | Fuse service | 64 | 5.0★ (444) | Palo Alto, 5 mi away | 24/7 | Emergencies |
| 3 | Fuse HVAC, Refrigeration, Electrical & Plumbing | 64 | 4.9★ (1,034) | Santa Clara, 9 mi away | 24/7 | — |
| 4 | IRBIS Air Plumbing Electrical | 64 | 4.9★ (1,466) | San Jose, 12 mi away | 24/7 | — |
| 5 | TRIO Heating, Air & Plumbing | 64 | 4.9★ (1,142) | San Jose, 12 mi away | 24/7 | — |
| 6 | Heating And Air Experts - Affordable HVAC Contractor in Fremont, California | 63 | 5.0★ (761) | Fremont, 12 mi away | 24/7 | — |
| 7 | Same Day Air Conditioning & Heating | 63 | 4.7★ (550) | Sunnyvale, 3 mi away | 24/7 | — |
| 8 | Fuse HVAC, Refrigeration, Electrical & Plumbing | 63 | 4.9★ (216) | Mountain View, 3 mi away | 24/7 | — |
| 9 | Nur HVAC | 63 | 5.0★ (364) | Mountain View, 2 mi away | Sat · Sun · Evenings | — |
| 10 | AIS Heating & Air Conditioning | 63 | 4.9★ (723) | Fremont, 12 mi away | 24/7 | — |
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.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 3,407 Google reviews, listed on Google as “HVAC contractor”.
Based in Palo Alto, 5 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 444 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Clara, 9 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 1,034 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 12 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 1,466 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 12 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 1,142 Google reviews, listed on Google as “HVAC contractor”.
Based in Fremont, 12 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 761 Google reviews, listed on Google as “HVAC contractor”.
Based in Sunnyvale, 3 mi away
Ranked #7 because of its Google rating and trade focus: 4.7★ from 550 Google reviews, listed on Google as “HVAC contractor”.
Based in Mountain View, 3 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 216 Google reviews, listed on Google as “HVAC contractor”.
Based in Mountain View, 2 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 364 Google reviews, listed on Google as “HVAC contractor”.
Based in Fremont, 12 mi away
Ranked #10 because of its Google rating and trade focus: 4.9★ from 723 Google reviews, listed on Google as “HVAC contractor”.
Based in Cupertino, 7 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 839 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 10 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 400 Google reviews, listed on Google as “HVAC contractor”.
Based in Palo Alto, 3 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 145 Google reviews, listed on Google as “HVAC contractor”.
Based in Menlo Park, 8 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 208 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 11 mi away
Ranked #15 because of its Google rating and trade focus: 4.6★ from 1,308 Google reviews, listed on Google as “HVAC contractor”.
Based in Pleasanton, 25 mi away
Ranked #16 because of its Google rating and review volume: 4.9★ from 3,438 Google reviews, the most in Los Altos.
Based in Santa Clara, 10 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 273 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 14 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 426 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 11 mi away
Ranked #19 because of its Google rating and trade focus: 4.7★ from 546 Google reviews, listed on Google as “HVAC contractor”.
Based in Palo Alto, 5 mi away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 87 Google reviews, listed on Google as “HVAC contractor”.
Based in Campbell, 16 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 560 Google reviews, listed on Google as “HVAC contractor”.
Based in Campbell, 12 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 166 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 14 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 236 Google reviews, listed on Google as “HVAC contractor”.
Based in Pleasanton, 24 mi away
Ranked #24 because of its Google rating and trade focus: 4.8★ from 2,337 Google reviews, listed on Google as “HVAC contractor”.
Based in Fremont, 10 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 115 Google reviews, listed on Google as “HVAC contractor”.
#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 498 ranked HVAC contractors here; the rest are on their profiles.
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.
| Business | Google rating | Distance |
|---|---|---|
| Air Conditioning Service Help | 5.0★ (2) | 12 mi |
| ALL PRO CLEANING SPECIALIST, INC. | 5.0★ (2) | 4 mi |
| Allied Aire Service, Inc. | 5.0★ (2) | 12 mi |
| Altai Heating & Air | 5.0★ (2) | 4 mi |
| Bay Area Mechanical LLC | 5.0★ (2) | 10 mi |
| C F Archibald Paving | 5.0★ (2) | 8 mi |
| CELLAR HVAC | 5.0★ (2) | 3 mi |
| Freon INC | 5.0★ (16) | 3 mi |
| Furnace Man | 5.0★ (2) | 9 mi |
| Golden Gate Mechanical, Inc. | 3.5★ (2) | 9 mi |
| Heating & Air Conditioning | 5.0★ (2) | 12 mi |
| Janal Heating & Air Conditioning | 5.0★ (2) | 8 mi |
| Melgar Mechanical | 3.0★ (2) | 9 mi |
| Pacific Coast Home Services | 4.4★ (735) | 13 mi |
| RCS Mechanical Services | 4.0★ (2) | 12 mi |
| Ron Williams Plumbing & Heating | 4.0★ (2) | 10 mi |
| Same Day Air Conditioning & Heating | 4.5★ (700) | 16 mi |
| San Jose Heating & Air Conditioning | 5.0★ (2) | 12 mi |
| Santa Clara Cleaning Service CO | 5.0★ (2) | 9 mi |
| Team Trusted Heating & Cooling | In Los Altos |
National price ranges in USD, not adjusted for Los Altos. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
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).
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
California's HVAC demand peaks during summer heat waves and the first cold snaps. Spring and fall are the easiest times to book maintenance.
We scored 498 Los Altos 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.
| Factor | Weight | Computed from | In Los Altos data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |