66/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 2,473 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,473 Google reviews
- Hours
- Mon–Sun 6 AM–7 PM
Best HVAC Contractors in Alamo, CA (2026)
544 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Alamo: Reliable Appliance, Heating and Air, CR Score 66/100; 4.9★ from 2,473 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): Service Champions, posts 24/7 hours; ranked #2 of 544.
- 2
Most-reviewed: Service Champions, 5,220 Google reviews at 4.9★, the most of 544 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
544 Alamo HVAC contractors are ranked here by CR Score, from ten published factors. 146 are open 24/7, 334 open Saturdays and 249 open Sundays, based on posted hours. The median Google rating is 4.9★ across 544 rated businesses.
Top 10 HVAC contractors in Alamo at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Reliable Appliance, Heating and Air | 66 | 4.9★ (2,473) | Alamo | Sat · Sun · Evenings | Overall |
| 2 | Service Champions | 65 | 4.9★ (5,220) | Martinez, 11 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Chill Heating and Cooling | 65 | 5.0★ (1,017) | San Ramon, 6 mi away | 24/7 | — |
| 4 | Hometown Heating and Air Conditioning | 64 | 4.9★ (2,463) | Concord, 11 mi away | 24/7 | — |
| 5 | Perfect Star Heating, Cooling, & Electrical | 64 | 4.9★ (1,255) | Concord, 7 mi away | 24/7 | — |
| 6 | Comfy Heating & Air Conditioning | 64 | 4.9★ (602) | Danville, 3 mi away | 24/7 | — |
| 7 | Jazz Heating, Air Conditioning and Plumbing | 64 | 4.9★ (3,438) | Pleasanton, 14 mi away | 24/7 | — |
| 8 | Service Champions | 64 | 4.9★ (4,721) | Livermore, 17 mi away | 24/7 | — |
| 9 | Chill Heating and Cooling | 64 | 5.0★ (481) | Walnut Creek, 6 mi away | 24/7 | — |
| 10 | Service Champions | 63 | 4.8★ (2,337) | Pleasanton, 12 mi away | 24/7 | — |
The 544 best HVAC contractors in Alamo, 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.
Based in Martinez, 11 mi away
65/100CR ScoreRanked #2 because of its Google rating and review volume: 4.9★ from 5,220 Google reviews, the most in Alamo.
- 4.9★ from 5,220 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 261 Arthur Rd, Martinez, CA 94553
Based in San Ramon, 6 mi away
65/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 1,017 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 1,017 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 23 Beta Ct suite f, San Ramon, CA 94583
Based in Concord, 11 mi away
64/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 2,463 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,463 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4075 Nelson Ave Suite D, Concord, CA 94520
Based in Concord, 7 mi away
64/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.9★ from 1,255 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,255 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4415 Cowell Rd, Concord, CA 94518
Based in Danville, 3 mi away
64/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 602 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 602 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 801 Lancelot Ct, Danville, CA 94526
Based in Pleasanton, 14 mi away
64/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 3,438 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 3,438 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2158 Rheem Dr, Pleasanton, CA 94588
Based in Livermore, 17 mi away
64/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 4,721 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 4,721 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 207 Boeing Ct, Livermore, CA 94551
Based in Walnut Creek, 6 mi away
64/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 481 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 481 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 11 Cll Este, Walnut Creek, CA 94597
Based in Pleasanton, 12 mi away
63/100CR ScoreRanked #10 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
Based in Antioch, 15 mi away
63/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 2,331 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,331 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2595 W 10th St, Antioch, CA 94509
Based in Berkeley, 13 mi away
63/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.7★ from 3,311 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 3,311 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3333 Martin Luther King Jr Way, Berkeley, CA 94703
Based in Alamo
63/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 358 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 358 Google reviews
- Hours
- Mon–Fri 8 AM–8 PM · Sat–Sun 9 AM–5 PM
Based in Concord, 11 mi away
62/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.8★ from 1,046 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 1,046 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2440 Sprig Ct, Concord, CA 94520
Based in Pleasant Hill, 6 mi away
62/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.8★ from 370 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 370 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3301 Vincent Rd, Pleasant Hill, CA 94523
Based in Pittsburg, 14 mi away
62/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.9★ from 851 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 851 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 620 Garcia Ave ste a, Pittsburg, CA 94565
Based in Alamo
62/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 73 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 73 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Concord, 10 mi away
62/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 324 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 324 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1717 Solano Way STE 7, Concord, CA 94520
Based in Brentwood, 20 mi away
61/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 709 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 709 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 570 Valdry Ct C3, Brentwood, CA 94513
Based in San Ramon, 6 mi away
61/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.8★ from 138 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.8★ from 138 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 111 Deerwood Rd STE 200, San Ramon, CA 94583
Based in Livermore, 19 mi away
61/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 920 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 920 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4935 Southfront Rd A, Livermore, CA 94551
Based in Alameda, 8 mi away
61/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.9★ from 130 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 130 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Hayward, 16 mi away
60/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.7★ from 863 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 863 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3266 Investment Blvd, Hayward, CA 94545
Based in San Francisco, 22 mi away
60/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 966 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 966 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 78 Dorman Ave, San Francisco, CA 94124
#25 Heise's Plumbing
Based in San Francisco, 24 mi away
60/100CR ScoreRanked #25 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
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 544 ranked HVAC contractors here; the rest are on their profiles.
Also serving Alamo
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 |
|---|---|---|
| AC Repair Danville | 5.0★ (2) | 3 mi |
| AC Repair San Ramon | 3.5★ (2) | In Alamo |
| All Heating & Air | In Alamo | |
| All Preventative Measures LLC | In Alamo | |
| ARASTEK Heating and Cooling , HVAC , Air Conditioning | 5.0★ (2) | In Alamo |
| Barker Heating & Cooling | 4.8★ (1,930) | 20 mi |
| Bay HVAC Alliance | 5.0★ (2) | In Alamo |
| Brothers Energy | 5.0★ (2) | In Alamo |
| California HVAC | 4.9★ (59) | 12 mi |
| Diablo Valley Comfort Systems | 5.0★ (2) | In Alamo |
| Double R Heating & Air Conditioning | 4.9★ (174) | 16 mi |
| Freeway Mechanical | 5.0★ (2) | In Alamo |
| North Star Heating & Cooling | In Alamo | |
| Premium Express Heating and Air Conditioning | 5.0★ (2) | In Alamo |
| Redfoxheating&cooling | 3.0★ (2) | In Alamo |
| Same Day Air Conditioning & Heating | 4.5★ (700) | 16 mi |
| Sayman Mechanical Systems, Inc. | 5.0★ (1) | In Alamo |
| Simple Air | 3.0★ (2) | 3 mi |
| United Constructors Inc. | 4.9★ (48) | In Alamo |
| Walnut Creek Construction and Remodeling Company | 5.0★ (25) | In Alamo |
How much do HVAC contractors cost in Alamo?
National price ranges in USD, not adjusted for Alamo. 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 |
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).
- Search the business name or license number on the Contractors State License Board (CSLB) license lookup.
- Check that the status is active and the name matches the contract or truck.
- 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 Alamo HVAC contractors
We scored 544 Alamo 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 Alamo 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 |
HVAC contractors in Alamo: frequently asked questions
Who is the best HVAC contractor in Alamo?
By CR Score, the highest-ranked HVAC contractor in Alamo, CA is Reliable Appliance, Heating and Air with a CR Score of 66/100. It has 4.9★ from 2,473 Google reviews. It is open 7 days a week. Service Champions (#2) and Chill Heating and Cooling (#3) follow. We ranked 544 HVAC contractors on ten factors, last updated October 22, 2026.
How many HVAC contractors are there in Alamo?
ContractorsRanked ranks 544 HVAC contractors serving Alamo, CA. 3 of them are based in Alamo; 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 Alamo are open 24/7?
146 ranked HVAC contractors in Alamo post 24/7 hours. The highest-ranked are Service Champions (#2), Chill Heating and Cooling (#3) and Hometown Heating and Air Conditioning (#4). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Alamo work on weekends?
334 of 544 ranked HVAC contractors post Saturday hours and 249 post Sunday hours. The highest-ranked open Saturdays are Reliable Appliance, Heating and Air (#1), Service Champions (#2) and Chill Heating and Cooling (#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 Alamo?
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 Alamo. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Alamo HVAC contractors have?
The median Google rating among 544 rated HVAC contractors in Alamo is 4.9★, with a median of 16 reviews. Service Champions has the most, 5,220 reviews, and ranks #2. 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 Alamo?
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 Alamo
- October 2026: CR Scores recalculated for 544 hvac contractors serving Alamo.
- October 2026: 5 duplicate listings merged.
More HVAC contractors and Alamo pages
HVAC contractors near Alamo
- HVAC contractors in Danville, CA543 ranked
- HVAC contractors in Saranap, CA545 ranked
- HVAC contractors in Walnut Creek, CA533 ranked
- HVAC contractors in Lafayette, CA569 ranked
- HVAC contractors in Waldon, CA521 ranked
- HVAC contractors in Moraga, CA616 ranked
- HVAC contractors in Contra Costa Centre, CA521 ranked
- HVAC contractors in San Ramon, CA585 ranked
- HVAC contractors in Pleasant Hill, CA509 ranked
- HVAC contractors in Blackhawk, CA465 ranked
Other trades in Alamo
- Roofers in Alamo772 ranked
- Plumbers in Alamo649 ranked
- Electricians in Alamo469 ranked
- General contractors in Alamo897 ranked
- Painters in Alamo238 ranked
- Landscapers in Alamo184 ranked
- Handymen in Alamo112 ranked
- Kitchen remodelers in Alamo444 ranked
- Bathroom remodelers in Alamo420 ranked
- Flooring contractors in Alamo298 ranked
- Tile installers in Alamo72 ranked
- Drywall contractors in Alamo36 ranked
- Concrete contractors in Alamo269 ranked
- Fence contractors in Alamo122 ranked
- Deck builders in Alamo139 ranked
- Siding contractors in Alamo104 ranked
- Window installers in Alamo326 ranked
- Gutter installers in Alamo164 ranked
- Insulation contractors in Alamo99 ranked
- Solar installers in Alamo305 ranked
- Garage door repair companies in Alamo208 ranked
- Foundation repair companies in Alamo131 ranked
- Tree services in Alamo230 ranked
- Masonry contractors in Alamo114 ranked
- Water damage restoration companies in Alamo400 ranked
- Home builders in Alamo507 ranked
- Demolition contractors in Alamo95 ranked
- All contractors in Alamo