Skip to content
Serving Fremont and nearby cities Open 24 hours, 7 days a week ยท (669) 286-3980

Heating Repair in San Carlos, CA

The short answer

PrimeAir HVAC Repair Service repairs gas furnaces and heat pumps in San Carlos homes, with 24/7 emergency service. Bay Area Air District rules do not require you to replace a working furnace, so a repair is often the sensible choice. If your furnace fails for good after 2029, the rules will steer most replacements toward heat pumps.

When your heat stops working in San Carlos, you want to know what's wrong, what it takes to fix it, and whether the repair makes sense for your system. PrimeAir HVAC Repair Service diagnoses and repairs gas furnaces, heat pumps, and the ductwork and controls that connect them in homes throughout the 94070 ZIP code. San Carlos is about 13 miles west of our Fremont base, across the Bay, and we schedule regular visits on the Peninsula. Winters here are mild, but a furnace that sits idle for most of the year can still fail on the first cold night. If that happens after hours, we offer 24/7 emergency service.

Heating problems we fix in San Carlos homes

Many heating calls start with a system that worked fine last spring and won't run after months of sitting idle. Dust, a weak ignition part, or a dead thermostat battery can stop a furnace before the season really begins. Other problems build up slowly, like short cycling or rooms that never warm up, and get worse until something fails.

These are the issues we diagnose and repair most often:

  • Furnace won't ignite, or lights and then shuts off
  • Blower runs but the air coming out is cool
  • Short cycling, where the system turns on and off every few minutes
  • Banging, squealing, or rattling from the furnace or ducts
  • Burning or musty smells when the heat comes on
  • Heat pump stuck in defrost, frozen over, or blowing lukewarm air
  • Thermostat not responding or not talking to the system
  • Uneven heat caused by leaky, crushed, or disconnected ducts

What happens during a repair visit

Our technician starts by asking what you've noticed: when the problem began, what it sounds or smells like, and whether it comes and goes. Then we test the system and find the actual cause instead of swapping parts until something works. On a gas furnace, that includes checking ignition, flame sensing, airflow, venting, and safety controls. On a heat pump, we look at refrigerant-side performance, the defrost cycle, the outdoor unit, and the electrical connections.

Before any work starts, we explain what we found in plain terms and lay out your options. If a part has to be ordered, we tell you so and make sure your system is safe to leave as it is in the meantime. If we find a safety concern, such as a cracked heat exchanger or a venting problem, we explain it and shut the system down if that's what keeping your household safe requires.

Repair or replace? What the Air District rules mean for you

San Carlos is in San Mateo County, which falls under the Bay Area Air District. Its appliance rules do not require you to replace equipment that works. They apply only when an existing furnace or water heater fails or gets replaced. If your furnace can be repaired safely and reliably, you are free to keep using it.

Planning ahead still helps. Under the Air District's furnace rule, natural gas furnaces manufactured from 2029 on must meet a zero-NOx emission standard. In practice, that points homeowners toward heat pumps when a furnace is replaced after that date. If your furnace is aging and needs frequent repairs, we can talk through whether one more repair makes sense or whether planning a heat pump switch on your own schedule is the better move.

If you're weighing a heat pump, note that the federal 25C tax credit covered qualifying heat pumps placed in service before December 31, 2025. It is not available for new installations after that date. Bay Area homeowners can still check BayREN and their local clean energy provider for current heat pump and electrification incentives. Those programs change by funding cycle, so we confirm the current offer before quoting it.

Heat pump repair on the Peninsula

More San Carlos homeowners now heat with heat pumps, and these systems need a technician who understands them. Common heat pump problems include a reversing valve that won't switch to heat, sensors that misread outdoor temperature, refrigerant leaks, and outdoor units blocked by leaves or plants. We repair ducted heat pumps and ductless mini-splits. We also help homeowners who have both a heat pump and a backup furnace get the two working together properly.

Serving San Carlos and nearby communities

We provide heating repair throughout San Carlos and in neighboring Redwood City, Foster City, Atherton, Menlo Park, and East Palo Alto. Whether your home has an attic furnace, a closet unit, or a newer heat pump, we come ready to diagnose it and give you clear options. For no-heat situations at night or on weekends, our 24/7 emergency service is available.

More services in San Carlos

Related

What to expect

How a visit goes

  1. Diagnose First

    We track down why your system is acting up before suggesting a part or a replacement, so you're not paying to guess.

  2. Plain Explanations

    We tell you what's wrong, what your choices are, and what each one involves, in language that makes sense. Then you decide.

  3. Repair When It Makes Sense

    If your equipment can be fixed and still has life left, we'll say so. Bay Area appliance rules don't require replacing a system that works, and neither do we.

FAQ

Common questions

Do I have to replace my gas furnace because of the Bay Area Air District rules?

No. The Air District rules don't require you to replace working equipment. They apply only when an existing furnace fails or is replaced. If your furnace can be repaired, you can keep using it.

What changes in 2029 for furnaces?

Natural gas furnaces manufactured from 2029 on must meet a zero-NOx emission standard under the Air District's rule. In practice, that points homeowners toward heat pumps when they replace a furnace after that date.

Can I still get the federal tax credit for a heat pump?

The federal 25C credit covered qualifying heat pumps placed in service before December 31, 2025, and it isn't available for new installations after that. Check BayREN and your local clean energy provider for current incentives, which change by funding cycle.

Do you offer emergency heating repair in San Carlos?

Yes. We offer 24/7 emergency service for San Carlos and nearby Peninsula communities, including Redwood City, Foster City, Atherton, Menlo Park, and East Palo Alto.

Why does my furnace smell like it's burning when I first turn it on?

A brief dusty smell at the start of the season is usually dust burning off the heat exchanger. If the smell lasts, smells electrical, or comes back every time the heat runs, turn the system off and have it checked.

Should I also think about my water heater?

The Air District's zero-NOx date for small water heaters was set for 2027, but the Board is considering amendments in November 2026 that could delay it. Check the current rule before planning a water heater replacement.

Need Heating or Cooling Help?

Tell us what your system is doing, and we'll set up a visit to find the cause and talk through your options. For urgent breakdowns, we offer 24/7 emergency service.

Request Service Call (669) 286-3980
Call (669) 286-3980 Request Service