Alameda Furnace 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, 6 active C-20 licences give an Alameda business address as of 2026-09-02, out of 260 across the county. That is a thin local bench. Expect an Alameda job to be run by a crew based a few minutes away rather than one with an Alameda address — for a same-day callout, drive time matters more than the pin on the map.

Only one holds the C-20 on its own. The other 5 also carry a general building or plumbing classification, so HVAC is one line of work among several for them — fine for a planned install, less reassuring at 9pm in August.

By business structure the Alameda list runs 3 limited-liability companies, 2 corporations, 1 sole owner. Limited-liability companies lead — typically small owner-run outfits that incorporated for the liability cover, so the chain between you and the person on the roof is still short.

Those addresses sit in a single ZIP: 94501 — and we cover it.

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 Alameda is number 562098; its newest is 1128499. Across the whole county the range runs 68847 to 1159177, so Alameda's oldest surviving licence sits in the middle of it — an established local trade without the county's oldest names.

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 Alameda 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.