Contact
721 E San Bernardino Rd, Covina, CA 91723
Hours
- Mon 9:00 am - 5:00 pm
- Tue 9:00 am - 5:00 pm
- Wed 9:00 am - 5:00 pm
- Thu 9:00 am - 5:00 pm
- Fri 9:00 am - 5:00 pm
- Sat Closed
- Sun Closed
From Google, checked May 2026. Page updated 23 October 2026.
From the business Google listing
At Sinclairair Systems, we provide affordable and reliable HVAC services you can count on — including air conditioning installation, heating repair, and smart thermostat upgrades. Based in La Verne, we proudly serve San Dimas, Claremont, Pomona, Glendora, Covina, West Covina, Upland, Rancho Cucamonga, Diamond Bar, and surrounding areas. With over 40 years of combined experience, our team is known for expert craftsmanship, honest pricing, and fast, friendly service. Whether you're a homeowner or business, we’re the HVAC contractor trusted to keep your space comfortable all year long.
Source: Google listing, Aug 2026
What this listing mentions
- Transgender safe space
- LGBTQ+ friendly
- Small business
- Installation service
- Repair service
- On-site parking
- Online estimates
Source: Google listing, Aug 2026
Google Reviews
These quotes come from Google Reviews and belong to their authors. They can be out of date.
We recently had our entire HVAC system, including all the ducting, fully replaced by Sinclair Air Systems and could not be happier with the results. Our old system was nearly 20 years old, no longer working, and had become unserviceable. Sinclair Air Systems came in with the best proposal by far. Other companies were quoting almost twice as much and recommending work we didn't actually need. What really stood out was how they worked with us on inside our budget.
Sinclair Air Systems did an excellent job installing our new HVAC system. The pricing was fair and the quality of work was top-notch. Professional crew and great results. Would definitely use them again!
Had Sinclair Air Systems install a new HVAC system and couldn't be happier. Fair pricing with no surprises, and the quality of work was outstanding. Professional team, clean installation, and the system works perfectly. Highly recommend!