68/100CR Score
Ranked #1 because of its Google rating and review volume: 4.8★ from 7,425 Google reviews, the most in Ontario.
- 4.8★ from 7,425 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5001 Ontario Mills Pkwy, Ontario, CA 91764
Best HVAC Contractors in Ontario, CA (2026)
985 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Ontario: All Pro Cooling, Heating, Plumbing & Electrical, CR Score 68/100; 4.8★ from 7,425 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Steve's Five Star Service, posts 24/7 hours; ranked #2 of 985.
- 23
Most-reviewed: Service Champions Plumbing, Heating & AC, 6,978 Google reviews at 4.9★, the most of 985 ranked after All Pro Cooling, Heating, Plumbing & Electrical; ranked #23.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
985 Ontario HVAC contractors are ranked here by CR Score, from ten published factors. 347 are open 24/7, 755 open Saturdays and 503 open Sundays, based on posted hours. The median Google rating is 4.9★ across 985 rated businesses.
Top 10 HVAC contractors in Ontario at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | All Pro Cooling, Heating, Plumbing & Electrical | 68 | 4.8★ (7,425) | Ontario | 24/7 | Overall |
| 2 | Steve's Five Star Service | 65 | 4.9★ (1,292) | Upland, 4 mi away | 24/7 | Emergencies |
| 3 | Klaus & Sons Plumbing, Heating & Air Conditioning | 65 | 4.9★ (977) | Montclair, 3 mi away | 24/7 | — |
| 4 | Metz Air Control | 64 | 4.9★ (969) | Chino, 5 mi away | 24/7 | — |
| 5 | Rooter Hero Plumbing & Air | 64 | 4.8★ (802) | Montclair, 4 mi away | 24/7 | — |
| 6 | RC Air Heating & Air Conditioning Service | 63 | 4.9★ (705) | Rancho Cucamonga, 5 mi away | 24/7 | — |
| 7 | NexGen HVAC & Plumbing | 63 | 4.6★ (507) | Ontario | 24/7 | — |
| 8 | Airplus of California Inc. | 63 | 4.9★ (1,325) | Corona, 13 mi away | 24/7 | — |
| 9 | MSP HEATING AND AIR CONDITIONING | 62 | 5.0★ (1,203) | Jurupa Valley, 15 mi away | 24/7 | — |
| 10 | Friends & Family HVAC | 62 | 4.9★ (1,213) | Corona, 13 mi away | 24/7 | — |
The 985 best HVAC contractors in Ontario, 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 Upland, 4 mi away
65/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 1,292 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.9★ from 1,292 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 665 N Central Ave, Upland, CA 91786
Based in Montclair, 3 mi away
65/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 977 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 977 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5623 E Arrow Hwy, Montclair, CA 91763
Based in Chino, 5 mi away
64/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 969 Google reviews, listed on Google as “Air conditioning repair service”.
- 4.9★ from 969 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 13784 Monte Vista Ave, Chino, CA 91710
Based in Montclair, 4 mi away
64/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.8★ from 802 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 802 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4650 Arrow Hwy, Montclair, CA 91763
Based in Rancho Cucamonga, 5 mi away
63/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 705 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.9★ from 705 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8327 Orange St, Rancho Cucamonga, CA 91701
Based in Ontario
63/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.6★ from 507 Google reviews, listed on Google as “HVAC contractor”.
- 4.6★ from 507 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1428 S Grove Ave Unit B, Ontario, CA 91761
Based in Corona, 13 mi away
63/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 1,325 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,325 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3050 Palisades Dr, Corona, CA 92878
Based in Jurupa Valley, 15 mi away
62/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 1,203 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 1,203 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2932 Rubidoux Blvd Suite B, Jurupa Valley, CA 92509
Based in Corona, 13 mi away
62/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.9★ from 1,213 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,213 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1611 Pomona Rd Suite 240, Corona, CA 92878
Based in Corona, 16 mi away
62/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.7★ from 4,107 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 4,107 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1240 Graphite Dr, Corona, CA 92881
Based in Fontana, 8 mi away
62/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.8★ from 708 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 708 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10820 Mulberry Ave, Fontana, CA 92337
Based in Jurupa Valley, 10 mi away
62/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 401 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 401 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9346 Galena St Ste. C, Jurupa Valley, CA 92509
Based in Covina, 13 mi away
62/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.8★ from 1,506 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 1,506 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 706 Arrow Grand Cir, Covina, CA 91722
Based in Rancho Cucamonga, 7 mi away
62/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 201 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 201 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8351 Rochester Ave ste 103b, Rancho Cucamonga, CA 91730
#16 Home Comfort USA
Based in Anaheim, 18 mi away
62/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.8★ from 2,813 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 2,813 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1120 N Tustin Ave, Anaheim, CA 92807
Based in Upland, 6 mi away
62/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 143 Google reviews, listed on Google as “Air conditioning contractor”.
- 5.0★ from 143 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2264 Ajuga Ave, Upland, CA 91784
Based in Chino, 6 mi away
62/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ from 392 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 392 Google reviews
- Hours
- Mon–Sat 7 AM–10 PM · Sun 8 AM–5 PM
- Address
- 3811 Schaefer Ave Suite D, Chino, CA 91710
Based in Ontario
62/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 413 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 413 Google reviews
- Hours
- Mon–Thu 7 AM–6 PM · Fri 7 AM–5 PM · Sat 8 AM–3 PM · Sun closed
- Address
- 1630 E Francis St ste c, Ontario, CA 91761
Based in Corona, 19 mi away
61/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.7★ from 3,741 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 3,741 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3959 Temescal Canyon Rd, Corona, CA 92883
Based in Anaheim, 17 mi away
61/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.7★ from 2,250 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 2,250 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5472 E La Palma Ave, Anaheim, CA 92807
Based in Anaheim, 16 mi away
61/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 1,899 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 1,899 Google reviews
- Hours
- Mon–Fri 6 AM–8 PM · Sat–Sun 7 AM–7 PM
- Address
- 5612 E La Palma Ave, Anaheim, CA 92807
Based in Brea, 15 mi away
61/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.9★ from 6,978 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 6,978 Google reviews
- Hours
- Mon–Fri 8 AM–7 PM · Sat 8 AM–5 PM · Sun closed
- Address
- 625 Columbia St, Brea, CA 92821
Based in Anaheim, 17 mi away
61/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 995 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 995 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1241 N Lakeview Ave Suite K, Anaheim, CA 92807
Based in Yorba Linda, 16 mi away
61/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.9★ from 764 Google reviews, listed on Google as “Air conditioning contractor”.
- 4.9★ from 764 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8642 Bridle Cir, Yorba Linda, CA 92886
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 985 ranked HVAC contractors here; the rest are on their profiles.
Also serving Ontario
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 |
|---|---|---|
| 4 Points A/C and Heating | 4.9★ (949) | 21 mi |
| Accurate Electric, Plumbing, Heating and Air | 4.9★ (69) | 4 mi |
| Air Bee HVAC | In Ontario | |
| AIR Designs 4 U LLC | In Ontario | |
| Airite | In Ontario | |
| American Plumbing, Heating, Air & Electrical | 5.0★ (57) | 6 mi |
| Evolution Mechanical | 4.8★ (219) | 13 mi |
| Fenco Heating And Air Conditioning | In Ontario | |
| GJR LLC | 5.0★ (1) | In Ontario |
| Golden Construction Chino | 5.0★ (2) | 4 mi |
| Honest Pro Air Conditioning & Heating - HVAC | 4.9★ (89) | 10 mi |
| Innovative Mechanical Services | In Ontario | |
| J's Heating & Cooling | In Ontario | |
| M.A. Ogg Heating & Air Conditioning, Inc. | 3.0★ (2) | 4 mi |
| Meza's Hvac | 5.0★ (2) | 6 mi |
| N & S Heating, Air Conditioning & Electrical | 4.5★ (2) | 3 mi |
| Price air | In Ontario | |
| RKM Heating and Air Conditioning | 4.9★ (1,073) | 22 mi |
| Synergy Mechanical Inc | 1.0★ (2) | 4 mi |
| West-Tech Mechanical Inc | 3.0★ (2) | 2 mi |
How much do HVAC contractors cost in Ontario?
National price ranges in USD, not adjusted for Ontario. 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 Ontario HVAC contractors
We scored 985 Ontario 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 23, 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 Ontario 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 Ontario: frequently asked questions
Who is the best HVAC contractor in Ontario?
By CR Score, the highest-ranked HVAC contractor in Ontario, CA is All Pro Cooling, Heating, Plumbing & Electrical with a CR Score of 68/100. It has 4.8★ from 7,425 Google reviews. It is open 24/7. Steve's Five Star Service (#2) and Klaus & Sons Plumbing, Heating & Air Conditioning (#3) follow. We ranked 985 HVAC contractors on ten factors, last updated October 23, 2026.
How many HVAC contractors are there in Ontario?
ContractorsRanked ranks 985 HVAC contractors serving Ontario, CA. 5 of them are based in Ontario; 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 Ontario are open 24/7?
347 ranked HVAC contractors in Ontario post 24/7 hours. The highest-ranked are All Pro Cooling, Heating, Plumbing & Electrical (#1), Steve's Five Star Service (#2) and Klaus & Sons Plumbing, Heating & Air Conditioning (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Ontario work on weekends?
755 of 985 ranked HVAC contractors post Saturday hours and 503 post Sunday hours. The highest-ranked open Saturdays are All Pro Cooling, Heating, Plumbing & Electrical (#1), Steve's Five Star Service (#2) and Klaus & Sons Plumbing, Heating & Air Conditioning (#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 Ontario?
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 Ontario. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Ontario HVAC contractors have?
The median Google rating among 985 rated HVAC contractors in Ontario is 4.9★, with a median of 18 reviews. All Pro Cooling, Heating, Plumbing & Electrical has the most, 7,425 reviews, and ranks #1. 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 Ontario?
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 Ontario
- October 2026: CR Scores recalculated for 985 hvac contractors serving Ontario.
- October 2026: 7 duplicate listings merged.
More HVAC contractors and Ontario pages
HVAC contractors near Ontario
- HVAC contractors in Upland, CA914 ranked
- HVAC contractors in Montclair, CA1003 ranked
- HVAC contractors in Chino, CA1184 ranked
- HVAC contractors in Rancho Cucamonga, CA846 ranked
- HVAC contractors in Claremont, CA1024 ranked
- HVAC contractors in Pomona, CA1167 ranked
- HVAC contractors in Los Serranos, CA1345 ranked
- HVAC contractors in La Verne, CA1048 ranked
- HVAC contractors in Chino Hills, CA1397 ranked
- HVAC contractors in Eastvale, CA1067 ranked
Other trades in Ontario
- Roofers in Ontario1496 ranked
- Plumbers in Ontario940 ranked
- Electricians in Ontario599 ranked
- General contractors in Ontario863 ranked
- Painters in Ontario156 ranked
- Landscapers in Ontario164 ranked
- Handymen in Ontario89 ranked
- Kitchen remodelers in Ontario404 ranked
- Bathroom remodelers in Ontario423 ranked
- Flooring contractors in Ontario388 ranked
- Tile installers in Ontario66 ranked
- Drywall contractors in Ontario34 ranked
- Concrete contractors in Ontario291 ranked
- Fence contractors in Ontario201 ranked
- Deck builders in Ontario101 ranked
- Siding contractors in Ontario99 ranked
- Window installers in Ontario587 ranked
- Gutter installers in Ontario108 ranked
- Insulation contractors in Ontario118 ranked
- Solar installers in Ontario490 ranked
- Garage door repair companies in Ontario180 ranked
- Foundation repair companies in Ontario160 ranked
- Tree services in Ontario288 ranked
- Masonry contractors in Ontario155 ranked
- Water damage restoration companies in Ontario1029 ranked
- Home builders in Ontario601 ranked
- Demolition contractors in Ontario108 ranked
- All contractors in Ontario