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Heating Repair in Los Altos, CA

The short answer

CoolVantage AC Repair diagnoses and repairs gas furnaces and heat pumps in Los Altos homes, from ignition and airflow problems to thermostat and defrost issues. Bay Area Air District rules do not require you to replace a working furnace, so a repair is often a sensible choice. If replacement makes more sense, we explain how upcoming furnace rules and current incentives may affect your decision.

Los Altos winters are mild by most standards, but cold, damp nights from late fall into early spring still put real demand on a home's heating system. When your heat stops working, blows lukewarm air, short-cycles, or starts making new noises, CoolVantage AC Repair sends a technician from our San Jose base to find the cause and fix it. We repair gas furnaces, heat pumps, and the thermostats and ductwork that connect them for homes in the 94024 ZIP code and nearby Santa Clara County communities.

Common Heating Problems We See in Los Altos Homes

The Santa Clara Valley has a Mediterranean climate, with dry summers and mild, damp winters. Many heating systems sit idle for months and then run steadily once the weather turns. That on-and-off pattern means problems often show up on the first cold night of the season, when dust, worn parts, or a weak component finally gets tested.

These are the issues homeowners call us about most often:

  • Furnace runs but blows cool or lukewarm air
  • Burners light briefly, then shut off
  • No heat at all, or the system won't respond to the thermostat
  • Burning smell that lingers past the first few minutes of the season
  • Banging, squealing, rattling, or grinding from the furnace or air handler
  • Weak airflow from some rooms or uneven temperatures between floors
  • Heat pump frosting over and not clearing, or running constantly without warming the house
  • Frequent short cycling that drives up energy use

What Happens During a Heating Repair Visit

Our technician starts by asking what you've noticed: when the problem started, whether it's constant or intermittent, and any sounds or smells. Then we check the system step by step, including the thermostat and its wiring, the filter, ignition and flame sensing, safety switches, the blower motor and capacitor, the condensate drain on high-efficiency furnaces, and venting. On heat pumps, we also check refrigerant-side performance and the defrost cycle.

Once we find the cause, we explain it in plain terms and give you the repair options before any work begins. If a part needs to be ordered, we tell you what to expect in the meantime and whether it's safe to keep running the system. If we find a safety concern, such as a cracked heat exchanger or a venting problem, we tell you directly and explain why it matters.

Repair or Replace? How Bay Area Air District Rules Fit In

Many Los Altos homeowners have heard about new Bay Area Air District appliance rules and wonder whether they need to replace their furnace now. They don't. The rules do not require replacing working equipment. They apply only when an existing furnace or water heater fails or is replaced, so repairing a furnace that's in reasonable shape is still a practical option.

Looking ahead, natural gas furnaces manufactured from 2029 must meet a zero-NOx emission standard under the Air District's Rule 9-4. In practice, that points homeowners toward heat pumps when a furnace is replaced after that date. If your furnace is older and needs frequent or major repairs, it's worth factoring that timeline into your decision.

On incentives: the federal Energy Efficient Home Improvement Credit (25C) only covered qualifying heat pumps placed in service before December 31, 2025, so 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 we discuss it with you.

Heat Pump Heating Repair

More Los Altos homes now heat with heat pumps, either as the main system or alongside a furnace. Heat pump heating problems differ from furnace problems. Common causes include a stuck reversing valve, a failing defrost control, low refrigerant from a leak, a dirty outdoor coil, or thermostat settings that call for backup heat more often than needed.

Because heat pumps also handle cooling, a repair that fixes the winter problem often protects summer performance too. We check both modes so you aren't surprised when the weather warms up.

When to Call and What You Can Check First

Before calling, check a few simple things: make sure the thermostat is set to heat and has working batteries, confirm the furnace switch and breaker are on, and replace a clogged filter. If the heat still doesn't work, it's time for a technician.

Call promptly, and turn the system off, if you smell gas, see scorching near the furnace, or notice your carbon monoxide alarm going off. Leave the house first if you smell gas. We also serve nearby Mountain View, Sunnyvale, Cupertino, Santa Clara, and Saratoga.

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What to expect

How a visit goes

  1. Clear explanations

    We show you what's wrong, tell you why it happened, and answer your questions in plain language. You shouldn't need HVAC experience to make a good decision about your own system.

  2. Options, not pressure

    If a repair will keep your equipment running well, we'll say so. If replacement makes more sense, we'll walk you through why and what your choices are, including heat pump and ductless options.

  3. Respect for your home

    We protect floors, clean up after ourselves, and leave the work area the way we found it. Before we leave, we walk you through what we did and how your system should run.

FAQ

Common questions

Don’t see your question? Call (302) 712-5037 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 don't require replacing working equipment. They apply only when a furnace fails or is replaced, so repairing your current furnace is allowed.

What changes for furnaces in 2029?

Natural gas furnaces manufactured from 2029 must meet a zero-NOx emission standard. 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?

No. The federal 25C credit covered qualifying heat pumps placed in service before December 31, 2025, and isn't available for newer installations. Check BayREN and your local clean energy provider for current incentives.

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

A short burning smell at the start of the season is usually dust burning off the heat exchanger. If it lasts more than a short while or smells electrical, turn the system off and call for service.

Why is my heat pump covered in frost?

Light frost on a heat pump in cold, damp weather is normal, and the defrost cycle should clear it. Heavy ice that doesn't clear can point to a defrost control, sensor, airflow, or refrigerant problem.

Do you repair heating systems throughout Los Altos?

Yes. We repair furnaces and heat pumps for homes in the 94024 ZIP code and nearby communities, including Mountain View, Sunnyvale, Cupertino, Santa Clara, and Saratoga.

Tell Us What Your System Is Doing

Whether it's a breakdown, a system that's struggling to keep up, or a plan to move to a heat pump, reach out and describe what's going on. We'll set up a visit, find the cause, and walk you through your options.

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