San Leandro AC Repair
done today, done right.

California licenses this trade as a C-20 — warm-air heating, ventilating and air-conditioning. In the Contractors State License Board register for Alameda County, 33 active C-20 licences give a San Leandro business address as of 2026-09-02, out of 260 across the county. That is one of the deepest benches in the county — enough that a San Leandro call rarely has to leave the city to find someone qualified.

20 hold the C-20 on its own; the other 13 also carry a general building or plumbing classification. A C-20-only shop does this work all day, which is worth knowing when two quotes look the same on paper.

By business structure the San Leandro list runs 20 corporations, 11 sole owners, 2 limited-liability companies. Corporations lead, which usually means a dispatcher sits between you and the tech — quicker to answer the phone, less certain who arrives.

Those addresses sit in 3 ZIPs: 94577 (24), 94578 (5), 94579 (4). 94577 alone accounts for 24 of the 33. We cover all of them.

CSLB issues licence numbers in sequence, so the register doubles as a record of how long the trade has been established here. The longest-held active C-20 in San Leandro is number 188225; its newest is 1159177. Across the whole county the range runs 68847 to 1159177, so San Leandro's oldest surviving licence sits near the very bottom of that range — this is old ground for the trade, with shops that long predate most of the county's.

That register is how we decide who gets your request: an active, unexpired licence, and a preference for the C-20-only shops. 3 of the San Leandro licences come up for renewal before the end of 2026, and a lapsed licence is uninsurable — one more reason to check the number rather than the van. Check ours, or anyone's, yourself — every California licence is public at the CSLB licence lookup. A contractor who will not give you a licence number has told you what you need to know.