The short answer
ChillPro AC Repair diagnoses and repairs gas furnaces and heat pumps in Sunnyvale homes, starting with the most likely causes and explaining your options before any work. Bay Area rules don't require you to replace a working furnace, so a sound system can usually just be repaired.
Sunnyvale winters are mild by most standards, but damp nights in December and January still get cold enough that a furnace or heat pump that won't start becomes a real problem quickly. ChillPro AC Repair sends technicians from our base in San Jose, about 7 miles southeast, to homes across Sunnyvale ZIP codes 94085, 94086, 94087 and 94089. We work on gas furnaces, heat pumps, and the thermostats and ductwork that tie them together. We find the cause, explain it in plain terms, and lay out your options before any work starts.
How Sunnyvale's Climate Affects Your Heating System
The Santa Clara Valley has a Mediterranean climate: dry summers and mild, damp winters. Sunnyvale sits closer to the Bay than the hotter southern end of the valley, so many furnaces here run only a few months a year and sit idle the rest. That pattern causes its own problems. Dust settles on burners and sensors over the summer, and small faults often go unnoticed until the first cold night in fall.
Heat pumps work differently. They handle both heating and cooling, so they run in most seasons and wear accordingly. When one stops heating, the cause is often in the outdoor unit, the reversing valve, or the controls rather than anything inside the house.
- Furnace clicks or tries to light but shuts off within seconds
- Burning-dust smell that lasts longer than the first few minutes of the season
- Blower runs but the air from the vents is cool
- Heat pump outdoor unit iced over or running nonstop
- Some rooms warm while others stay cold
- Thermostat calls for heat but nothing happens
What We Check on a Heating Repair Visit
We start with the simple, likely causes before moving to parts that cost more to replace. On a typical visit we test and inspect:
- Thermostat settings, wiring and power
- Air filter and return airflow
- Flame sensor, igniter and burners on gas furnaces
- Inducer motor, pressure switch and venting
- Blower motor, capacitor and belt where applicable
- Heat pump refrigerant performance, defrost function and reversing valve
- Accessible ductwork for disconnected or crushed runs
Repair or Replace: What the Bay Area Rules Mean for You
Many Sunnyvale homeowners have heard that gas furnaces are being phased out and worry they'll be forced to replace a working system. That isn't how it works. The Bay Area Air District's appliance rules don't require anyone to replace working equipment. They apply only when an existing furnace fails or is replaced.
What the rules do change is the future. Under Rule 9-4, natural gas furnaces manufactured starting in 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 aging and needs a major repair, it's worth weighing the repair against that timeline. We'll tell you plainly whether we think a repair is a good use of your money.
If you're considering a heat pump, check current incentives through BayREN and your local clean energy provider. Amounts and availability change by funding cycle, so we confirm the current offer before including it in a quote. Note that the federal 25C tax credit covered qualifying heat pumps placed in service before December 31, 2025, and isn't available for new installations after that date.
Things to Check Before You Call
A few quick checks can sometimes restore heat or at least narrow down the problem. If none of these work, or you smell gas, stop and call for service. If you smell gas, leave the house first and contact your gas utility.
- Confirm the thermostat is set to Heat and replace its batteries if it uses them
- Look at the air filter and replace it if it's clogged
- Check that the furnace or air handler breaker hasn't tripped
- Make sure the furnace service switch, which often looks like a light switch, is on
- Clear leaves or debris from around an outdoor heat pump unit
Serving Sunnyvale and Nearby Cities
Along with Sunnyvale, we handle heating repair in Mountain View, Santa Clara, Los Altos, Cupertino and Los Altos Hills. Homes across these communities range from older houses with original ductwork to newer builds with heat pumps. We adjust our approach to the equipment you actually have.
More services in Sunnyvale
- AC Repair in Sunnyvale
- Heat Pump Installation in Sunnyvale
- AC Installation in Sunnyvale
- Furnace Repair in Sunnyvale
