The short answer
CoolForce AC Repair repairs gas furnaces, heat pumps, and thermostats for Los Altos homes, starting with a full diagnosis so you know exactly what failed and why. Bay Area Air District rules don't force you to replace a working furnace, so repair is often a sensible choice, and we'll tell you honestly when it isn't.
Los Altos winters are mild, but the nights are cool and damp enough that a furnace or heat pump that won't start becomes a real problem fast. CoolForce AC Repair handles heating repair for homes throughout Los Altos (94024), coming up from our base in San Jose about 14 miles away. We diagnose gas furnaces, heat pumps, and the thermostats and ductwork that connect them, explain what we find in plain terms, and fix what makes sense to fix. Because heating systems here sit idle for much of the year, many of the problems we see come from that long off-season: dust on burners, weak ignitors, dead thermostat batteries, and filters that were forgotten after summer.
Common Heating Problems in Los Altos Homes
The Santa Clara Valley has a Mediterranean climate with dry summers and mild, damp winters. That means most Los Altos heating systems run hard for a few months and then sit unused. Parts that wear out from cycling, like ignitors and flame sensors, often fail on the first cold night of the season. Dust that settles during the dry months can also cause a burning smell or a sensor fault the first time the system fires.
These are the calls we get most often:
- Furnace blower runs but only blows cool air
- System tries to start, clicks, then shuts off
- Heat pump runs constantly without warming the house
- Burning or dusty smell that lingers past the first few minutes
- Thermostat is blank or doesn't respond
- Some rooms stay cold while others are fine
- Loud banging, squealing, or rattling from the furnace or outdoor unit
What Happens on a Heating Repair Visit
We start by confirming the basics: thermostat settings, power, the filter, and, on gas furnaces, the gas supply. From there we check the ignition sequence, flame sensor, limit switches, pressure switch, inducer and blower motors, and the control board's error codes. On heat pumps we look at the reversing valve, defrost controls, capacitors, refrigerant pressures, and the outdoor coil.
Before any work begins, we explain what failed, what caused it if we can tell, and what the repair involves. If a part isn't on the truck, we'll tell you that up front and explain the next steps. We also check for safety issues like a cracked heat exchanger or poor venting, because a furnace that produces heat isn't always operating safely.
Furnace and Heat Pump Repair
Many Los Altos homes still heat with a gas furnace in a garage, attic, or hall closet. Others have switched to heat pumps, or use a heat pump alongside a furnace. We repair all three setups. Heat pumps behave differently from furnaces: they deliver steady, gentler warmth and will occasionally pause heating to run a defrost cycle on damp mornings. Knowing what's normal and what isn't helps us avoid replacing parts that are working as designed.
If ductwork is part of the problem, such as disconnected runs, crushed flex duct, or leaks in attic or crawlspace ducts, we'll point it out, because a healthy furnace can still leave rooms cold when air never reaches them.
Repair or Replace? What Bay Area Rules Mean for You
Bay Area Air District appliance rules do not require you to replace working equipment. They apply only when an existing furnace fails or is replaced. Repairing your current furnace is allowed, and for a system in decent shape it's often the practical choice.
Looking further ahead, under Rule 9-4, natural gas furnaces manufactured from 2029 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 older and needing frequent repairs, it's worth factoring that into your plans.
On incentives: the federal 25C tax credit covered qualifying heat pumps placed in service before December 31, 2025, and it isn't available for new installations after that. Local programs through BayREN and your clean energy provider may still help, but amounts and availability change by funding cycle, so we confirm the current offer before quoting it.
Before You Call: Quick Checks
A few simple checks can sometimes get heat back on or help us diagnose faster:
- Replace the thermostat batteries and confirm it's set to Heat
- Check the breaker for the furnace or heat pump and the furnace's power switch
- Swap a dirty filter for a clean one
- Make sure supply and return vents aren't blocked by furniture or rugs
- If you smell gas, leave the house and call your gas utility first
More services in Los Altos
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- AC Installation in Los Altos
- Furnace Repair in Los Altos