Popular Cities
24 companies listed · 5 in Union City · 4 open 24/7 · 14 open weekends · 20 rated 4.5+
Data verified October 15, 2026
The 24 companies listed for Union City, CA work on furnaces, heat pumps and air conditioners. Each profile repeats what the company publishes about its hours, its license and the equipment it fits, alongside ratings and quotes drawn from public reviews.
Of the 24 companies we list here, 5 are in Union City itself and 19 come from towns including Redwood City (11, 13 mi), Foster City (2, 14 mi) and Livermore (2, 15 mi). 21 of the companies on this page have a rating, from 4.0 to 5.0 across 3,100 reviews; 7 have 50 or more reviews and 20 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (89%), responsiveness (79%) and quality (69%). The topics that come up most in reviews of the companies on this page are "price", "efficient" and "estimates". 4 are open around the clock; 12 are open on Saturdays and 10 on Sundays. 10 show a license on their websites; 2 list staff certifications (NATE) and 4 have a BBB rating of A or A+. 14 have ten or more years of experience, the longest 62 years. 6 offer emergency call-outs; 5 offer financing or payment plans; 9 give free estimates; 7 are family- or locally-owned and 6 list coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Round the clock availability appears in 4 of the 24 listings on this page. An overnight visit is usually a diagnosis and a temporary fix, since supply counters are shut until morning. Ask what the after hours call out is before the truck leaves.
