❄️ Official Rankings
10 Best HVAC in Ontario, CA (September 2026)
We compared 10 hvac serving Ontario and San Bernardino County, California, and ranked the top providers by verified reviews, ratings, and local reputation — 14,085 customer reviews in all.
The 10 listed below hold an average rating of 4.9 out of 5, led by Diamond Air Services. Updated for September 2026.
- HVAC ranked
- 10
- Average rating
- 4.9★
- Reviews analyzed
- 14,085
- Area code
- 909
⭐ 5.0 · 424 reviews
1630 E Francis St Ste c, Ontario, CA 91761
⭐ 5.0 · 131 reviews
615 N Benson Ave, Upland, CA 91786
⭐ 4.9 · 1680 reviews
665 N Central Ave, Upland, CA 91786
⭐ 4.9 · 1197 reviews
13784 Monte Vista Ave, Chino, CA 91710
⭐ 4.9 · 992 reviews
5623 E Arrow Hwy, Montclair, CA 91763
⭐ 5.0 · 100 reviews
4959 Palo Verde St Ste 208C-7, Montclair, CA 91763
⭐ 4.9 · 445 reviews
34 N Central Ave, Upland, CA 91786
⭐ 4.8 · 8882 reviews
2311 E Locust St, Ontario, CA 91761
⭐ 5.0 · 48 reviews
8608 Utica Ave Ste 220 RS, Rancho Cucamonga, CA 91730
⭐ 4.8 · 186 reviews
4375 E Lowell St Ste n, Ontario, CA 91761
HVAC listed here serve Ontario, San Bernardino County, and nearby ZIP codes including 91758, 91761, 91762, 91764, 91798.