HVAC & AC Repair in Union City, CA

Trusted HVAC Contractor in Union City

Union City sits right at the hinge between the Tri-City area and the southern East Bay, and Therma Tech serves it as part of our East Bay expansion. Between the Decoto neighborhood, the newer developments around Union Landing, and the townhome clusters near the BART station, we see everything from 1970s gas furnaces to two-year-old variable-speed heat pumps in one week of work.

The local climate is genuinely mild, which sounds like good news but quietly hides problems. A marginally low refrigerant charge or a failing capacitor can go unnoticed for a whole season in Union City because the system is rarely pushed hard — until the first stretch of 95-degree days arrives and it can't keep up. Our diagnostics measure amp draw, superheat and subcooling, and static pressure rather than relying on how the air feels at the register, so we catch the slow failures before they turn into a no-cool call.

Two-story homes here are our most frequent comfort complaint: upstairs bedrooms that run five to eight degrees warmer than the thermostat reading. That is almost always a duct-balancing or return-air problem rather than a system-capacity problem, and it is usually far cheaper to correct than a full replacement. We measure airflow room by room and show you the numbers before proposing anything.

Every Union City job is priced upfront in writing, permitted where required, and performed by NATE-certified employees. Same-day appointments are standard for repairs, and financing is available upon approval on qualifying installations if a replacement turns out to be the smarter long-term call.

Services Available in Union City

• AC Repair & Installation
• Heating & Furnace Repair
• Heat Pump Installation & Service
• HVAC Tune-Up & Maintenance
• Commercial HVAC Service

Why Union City Homeowners Choose Therma Tech

• Same-day appointments across Union City
• Free diagnostic with any approved repair
• Upfront, written pricing — no surprises
• NATE-certified, background-checked technicians
• Financing available upon approval on new installs
• Carrier authorized dealer with full warranty support