Top 50 of 677 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.
#1 for emergency heating and cooling in Union City: Jazz Heating, Air Conditioning and Plumbing, open 24/7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
| Rank | Business | CR Score | Google rating | Based in | Hours |
|---|---|---|---|---|---|
| 1 | Jazz Heating, Air Conditioning and Plumbing | 65 | 4.9★ (3,438) | Pleasanton, 10 mi away | 24/7 |
| 2 | Service Champions | 65 | 4.9★ (4,721) | Livermore, 14 mi away | 24/7 |
| 3 | Service Champions | 65 | 4.8★ (2,337) | Pleasanton, 9 mi away | 24/7 |
| 4 | Heating And Air Experts - Affordable HVAC Contractor in Fremont, California | 64 | 5.0★ (761) | Fremont, 6 mi away | 24/7 |
| 5 | Service Champions | 64 | 4.9★ (3,407) | San Jose, 15 mi away | 24/7 |
| 6 | AIS Heating & Air Conditioning | 64 | 4.9★ (723) | Fremont, 7 mi away | 24/7 |
| 7 | Bell Brothers Plumbing Heating & Air - Hayward | 64 | 4.7★ (863) | Hayward, 6 mi away | 24/7 |
| 8 | Service Hero Plumbing & Air | 63 | 4.5★ (1,252) | Hayward, 6 mi away | 24/7 |
| 9 | Chill Heating and Cooling | 63 | 5.0★ (1,017) | San Ramon, 13 mi away | 24/7 |
| 10 | Same Day Air Conditioning & Heating | 63 | 4.5★ (700) | Hayward, 5 mi away | 24/7 |
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.
#1Jazz Heating, Air Conditioning and Plumbing
Open 24/7 · 4.9 from 3,438 Google reviews
Open 24/7 · 4.9 from 4,721 Google reviews
Open 24/7 · 4.8 from 2,337 Google reviews
#4Heating And Air Experts - Affordable HVAC Contractor in Fremont, California
Open 24/7 · 5.0 from 761 Google reviews
Open 24/7 · 4.9 from 3,407 Google reviews
#6AIS Heating & Air Conditioning
Open 24/7 · 4.9 from 723 Google reviews
#7Bell Brothers Plumbing Heating & Air - Hayward
Open 24/7 · 4.7 from 863 Google reviews
Open 24/7 · 4.5 from 1,252 Google reviews
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 677 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.
Ranked #1 in Union City
Based in Pleasanton, 10 mi away
Ranked #1 because of its Google rating and trade focus: 4.9★ from 3,438 Google reviews, listed on Google as “HVAC contractor”.
Based in Livermore, 14 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 4,721 Google reviews, listed on Google as “HVAC contractor”.
Based in Pleasanton, 9 mi away
Ranked #3 because of its Google rating and trade focus: 4.8★ from 2,337 Google reviews, listed on Google as “HVAC contractor”.
Based in Fremont, 6 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 761 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 15 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 3,407 Google reviews, listed on Google as “HVAC contractor”.
Based in Fremont, 7 mi away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 723 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 6 mi away
Ranked #7 because of its Google rating and trade focus: 4.7★ from 863 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 6 mi away
Ranked #8 because of its Google rating and trade focus: 4.5★ from 1,252 Google reviews, listed on Google as “HVAC contractor”.
Based in San Ramon, 13 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 1,017 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 5 mi away
Ranked #10 because of its Google rating and trade focus: 4.5★ from 700 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 15 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 1,466 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 5 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 8 mi away
Ranked #13 because of its Google rating and trade focus: 4.6★ from 474 Google reviews, listed on Google as “HVAC contractor”.
Based in Santa Clara, 17 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 1,034 Google reviews, listed on Google as “HVAC contractor”.
Based in Palo Alto, 13 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 444 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 17 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 1,142 Google reviews, listed on Google as “HVAC contractor”.
Based in Livermore, 19 mi away
Ranked #17 because of its Google rating and trade focus: 4.8★ from 1,930 Google reviews, listed on Google as “HVAC contractor”.
Based in Livermore, 17 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 920 Google reviews, listed on Google as “HVAC contractor”.
Based in Berkeley, 22 mi away
Ranked #19 because of its Google rating and trade focus: 4.7★ from 3,311 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 15 mi away
Ranked #20 because of its Google rating and trade focus: 4.6★ from 1,308 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 7 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 162 Google reviews, listed on Google as “HVAC contractor”.
Based in Newark, 4 mi away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 122 Google reviews, listed on Google as “HVAC contractor”.
Based in Danville, 16 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 602 Google reviews, listed on Google as “HVAC contractor”.
Based in San Lorenzo, 9 mi away
Ranked #24 because of its Google rating and trade focus: 4.7★ from 265 Google reviews, listed on Google as “HVAC contractor”.
Based in Pleasanton, 10 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 153 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.
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.
| Factor | Weight | Computed from |
|---|---|---|
| Reputation | 15% | Google star rating, adjusted for how many reviews back it |
| Credentials | 15% | Active state license, bond and workers’ comp on file |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list |
| Recency | 5% | Share of reviews from the last 12 months |
| Availability | 15% | Weekly open hours, Saturday, Sunday, 24/7 or same-day |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) |
| Proximity | 5% | Based in the city scores highest, less the farther away it is |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are |