The short answer
PrimeAir repairs gas furnaces in Union City, CA, including no-heat, ignition, airflow, and noise problems, and offers 24/7 emergency service. Bay Area rules don't force you to replace a working furnace, so a sound repair is often the practical choice. If replacement makes more sense, we'll explain your options, including heat pumps.
When your furnace quits on a cold, damp Union City night, you want a clear answer about what's wrong and what it will take to fix it. PrimeAir HVAC Repair Service is based in Fremont, about 3 miles southwest of Union City, so homes across the 94587 ZIP code are close by. We diagnose and repair gas furnaces, explain what we find in plain terms, and tell you honestly whether a repair makes sense. If you're weighing repair against replacement, we'll also walk you through how current Bay Area Air District rules affect that choice.
Furnace Problems We Fix in Union City Homes
Most furnace calls come down to a handful of causes. Many furnaces sit unused through the warm months, and the first cold snap is often when worn parts show up. A dirty flame sensor, a failing igniter, or a clogged filter can keep an otherwise healthy furnace from running. We test each part of the system to find the actual cause instead of guessing and replacing parts.
- Furnace runs but blows cool or lukewarm air
- Burners light and then shut off after a few seconds
- No ignition, or repeated clicking with no flame
- Blower motor that won't start, hums, or runs nonstop
- Short cycling, where the furnace turns on and off frequently
- Rattling, squealing, or booming sounds at startup
- Thermostat calling for heat with no response from the furnace
- Weak airflow from some or all vents
What Happens During a Repair Visit
Our technician starts by asking what you've noticed: when the problem began, what sounds or smells you've picked up, and whether the furnace has been serviced recently. Then we inspect the thermostat, filter, ignition system, flame sensor, gas valve, blower, pressure switch, and venting. We also check for safety issues such as cracks in the heat exchanger or venting problems that could affect carbon monoxide.
Before any work begins, we explain what we found and what we recommend. You decide how to proceed. If a part has to be ordered, we'll tell you so and make sure your home is safe in the meantime.
Repair or Replace? How Bay Area Rules Affect Your Decision
Union City is in Alameda County, which falls under the Bay Area Air District. Under the Air District's Rule 9-4, natural gas furnaces manufactured from 2029 onward must meet a zero-NOx emission standard. In practice, that points homeowners toward heat pumps when a furnace is replaced after that date.
Those rules do not require you to replace working equipment. They apply only when an existing furnace fails or is replaced. If your furnace can be repaired safely and reliably, keeping it running is a reasonable choice. We'll give you a straight assessment of its condition so you can plan ahead instead of being caught off guard by a breakdown.
If you're considering a heat pump, keep in mind that the federal Energy Efficient Home Improvement Credit (25C) only covered qualifying heat pumps placed in service before December 31, 2025. It isn't available for new installations. Bay Area homeowners can still check BayREN and their local clean energy provider for current heat pump and electrification incentives. Amounts and availability change by funding cycle, so we confirm the current offer before including it in any quote.
Quick Checks Before You Call
A few simple checks can sometimes get the heat back on, or at least help us diagnose the problem faster. If you smell gas, skip these checks. Leave the house and call your gas utility from outside.
- Confirm the thermostat is set to Heat and the temperature is set above room temperature
- Replace the thermostat batteries if it has them
- Check that the furnace power switch, which often looks like a light switch, is on
- Look at the breaker panel for a tripped breaker
- Inspect the air filter and replace it if it's dirty
- Make sure the furnace access panel is fully closed, since a safety switch can keep the furnace from running
Emergency Furnace Repair and Nearby Service
Furnaces rarely fail at a convenient time. PrimeAir offers 24/7 emergency service, so you don't have to wait for business hours when your home is losing heat. Because we're based just down the road in Fremont, Union City is a short trip for our technicians. We also repair furnaces in Hayward, Newark, Pleasanton, San Leandro, and Menlo Park.
More services in Union City
- AC Repair in Union City
- Heating Repair in Union City
- Heat Pump Installation in Union City
- AC Installation in Union City
