Union City 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, 9 active C-20 licences give an Union City business address as of 2026-09-02, out of 260 across the county. That is a middling bench — enough choice to be selective, few enough that the good ones are booked solid in the first heatwave.

6 hold the C-20 on its own; the other 3 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 Union City list runs 4 corporations, 4 sole owners, 1 limited-liability company. No single structure dominates, so what turns up varies with who takes the call.

Those addresses sit in a single ZIP: 94587 — 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 Union City is number 773869; its newest is 1144327. Across the whole county the range runs 68847 to 1159177, so Union City's oldest surviving licence sits well up it: every active licence in Union City was issued after most of the county's were, so the local trade here is newer than its neighbours'.

That register is how we decide who gets your request: an active, unexpired licence, and a preference for the C-20-only shops. 1 of the Union City 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.