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Heating Repair in Los Altos, CA

The short answer

If your heat isn't working in Los Altos, a technician can usually trace the problem to a specific part, such as an igniter, flame sensor, blower motor, thermostat, or heat pump component, and repair it. Bay Area Air District rules do not require you to replace a working furnace, so repairing your existing system remains a valid option.

Los Altos winters are mild and damp rather than harsh, so many furnaces and heat pumps sit mostly idle through the dry months and then run every morning and evening once the rain and cool nights arrive. That seasonal restart is when problems tend to surface: a furnace that clicks but won't light, a heat pump blowing lukewarm air, or a system that runs constantly without warming the house. Prime Choice HVAC Repair Service sends technicians from our base in San Jose, about 11 miles away, to diagnose and repair gas furnaces, heat pumps, and the thermostats and ductwork that connect them in homes throughout Los Altos.

Heating problems we commonly diagnose in Los Altos homes

Because heating systems here often sit unused for long stretches, parts that worked fine last winter can fail on the first cold night. Dust settles on burners and sensors, filters get forgotten, and small electrical issues show up only under load. These are the symptoms homeowners most often call about:

  • Furnace won't ignite, or lights briefly and then shuts off
  • Blower runs but the air coming out of the vents is cool
  • System turns on and off every few minutes (short cycling)
  • Heat pump blows lukewarm air or ices up on cold mornings
  • Rattling, squealing, or banging from the furnace or air handler
  • Some rooms stay cold while others overheat
  • Thermostat is blank, unresponsive, or doesn't match the room temperature
  • Burning or dusty smell that lingers past the first few minutes of operation

What happens during a heating repair visit

Your technician starts by asking what you've noticed and when it started, then checks the thermostat, power, and filter before opening the equipment. On a gas furnace, that usually means watching a full ignition cycle and testing the igniter, flame sensor, pressure switch, limit switch, and blower. On a heat pump, it means checking the outdoor unit, defrost operation, refrigerant-side performance, and the backup heat strips if your system has them.

Once the cause is found, we explain what failed and why, describe your repair options in plain terms, and get your approval before any work begins. If something we find raises a safety concern, such as a cracked heat exchanger or signs of a venting problem, we'll show you what we see and explain why the system shouldn't run until it's addressed.

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

Many Los Altos homeowners have heard that gas furnaces are being phased out and wonder whether repairing an older unit is worth it. Under Bay Area Air District Rule 9-4, natural gas furnaces manufactured from 2029 onward must meet a zero-NOx emission standard, which in practice points toward heat pumps when a furnace is replaced after that date. The rules do not require you to replace working equipment. They apply only when an existing furnace fails or is replaced, so fixing the system you have is still allowed.

If your furnace is near the end of its life, we can talk through whether a repair makes sense now or whether it's time to start planning for a heat pump. Keep in mind that the federal 25C tax credit for qualifying heat pumps covered only systems placed in service before December 31, 2025, so it is not available for new installations. BayREN and your local clean energy provider may offer heat pump and electrification incentives, but amounts change by funding cycle, so we confirm the current offer before including it in any quote.

Quick checks before you schedule a repair

A few simple steps can sometimes restore heat or help your technician diagnose the problem faster:

  • Confirm the thermostat is set to Heat and above the current room temperature, and replace its batteries if it uses them
  • Check the breaker for the furnace or air handler and the outdoor heat pump unit
  • Make sure the furnace's power switch, which often looks like a light switch nearby, is on
  • Replace a dirty air filter, since a clogged filter can cause overheating and shutdowns
  • Clear leaves and debris from around the outdoor heat pump unit
  • If you smell gas or a carbon monoxide alarm sounds, leave the house and call your gas utility or 911 from outside

Serving Los Altos and nearby communities

We work on heating systems in homes throughout Los Altos, including the 94024 ZIP code. Our technicians also serve the surrounding Santa Clara County communities of Los Altos Hills, Mountain View, Sunnyvale, Cupertino, and Santa Clara, so if you have family or a rental property nearby, we can help there too.

More services in Los Altos

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What to expect

How a visit goes

  1. Diagnosis Before Recommendations

    We find the actual cause of the problem before suggesting a part, a repair, or new equipment. You'll know what's wrong and why.

  2. Honest Repair-or-Replace Advice

    If a repair will keep your system running reliably, we'll say so. If replacement makes more sense, we'll explain your options, including heat pumps and ductless systems, without pressure.

  3. Clear, Current Information

    Appliance rules and incentive programs change. We check the current details before we talk about them, so you're planning with accurate information.

FAQ

Common questions

Don’t see your question? Call (669) 274-2438 and we’ll talk it through.

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

No. The Bay Area Air District appliance rules do not require replacing working equipment. They apply only when an existing furnace fails or is replaced, and the zero-NOx standard covers furnaces manufactured from 2029 onward.

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

After months of sitting idle, dust collects on the burners and heat exchanger and burns off during the first few cycles. A smell that fades quickly is usually normal. If it persists, smells electrical, or smells like gas, turn the system off and have it inspected.

Is my heat pump broken if it blows lukewarm air?

Not necessarily. Heat pump air often feels cooler than furnace air even when it's working normally. If rooms aren't reaching the set temperature, the outdoor unit is iced over for long periods, or the system runs nonstop, it's worth having it checked.

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

The federal Energy Efficient Home Improvement Credit (25C) covered qualifying heat pumps placed in service before December 31, 2025, and is not available for installations after that date. Check BayREN and your local clean energy provider for current incentives.

Why does my furnace keep turning on and off?

Short cycling is often caused by a clogged filter, a dirty flame sensor, an overheating limit switch, or a thermostat issue. Replace the filter first. If the cycling continues, a technician can test the components to find the cause.

What areas near Los Altos do you serve?

Besides Los Altos, we serve Los Altos Hills, Mountain View, Sunnyvale, Cupertino, and Santa Clara, with technicians dispatched from our base in San Jose.

Need Heating or Cooling Help?

Tell us what's going on with your system, and we'll set up a time to take a look. We'll explain what we find and walk you through your options before any work begins.

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