Sinclair Air Systems
Air Conditioning Contractor
Hours
| Monday | 9:00 am - 5:00 pm |
|---|---|
| Tuesday | 9:00 am - 5:00 pm |
| Wednesday | 9:00 am - 5:00 pm |
| Thursday | 9:00 am - 5:00 pm |
| Friday | 9:00 am - 5:00 pm |
| Saturday | Closed |
| Sunday | Closed |
From Google, checked May 2026.
Google Reviews
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!
In the business's own words
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.
What this listing mentions
- Transgender safe space
- LGBTQ+ friendly
- Small business
- Installation service
- Repair service
- On-site parking
- Online estimates
Mini-split, AC and furnace work in Covina
Sinclair Air Systems installs ductless mini-splits, central air conditioning, heat pumps and furnaces. Its website describes each install as starting with a load calculation so the new system fits the size of the home. The company also says it handles smart thermostat upgrades, and Google lists it for dryer vent cleaning and air conditioning repair.
The company says it is family-owned and based in La Verne. It names Glendora, Covina and Pomona among the towns it covers, and it reports over 40 years of combined experience on its team. Its website states that you get a firm price before any work starts and that same-day repairs are offered during business hours.
Covina has a mean temperature of 63.7°F per NOAA normals for 1991-2020. The average high is 74.2°F and the average low is 53.2°F.
Before you call Sinclair Air Systems
The shop is open Monday to Friday from 9 am to 5 pm and closed on weekends. It holds a 4.7 rating from 36 Google reviews.
Reviewers mention fair prices most, and several say the crew steered them away from work they did not need. Many also say installs were done in a single day, with the crew on time and the site left clean.
Same-day help runs on business hours. If your cooling starts to struggle late in the week, call before Friday afternoon rather than waiting for the weekend.