HVAC Repair for San Jose Homes, Explained Before It Is Fixed
ClearSky Heating & Cooling services furnaces, air conditioners, heat pumps and ductwork in San Jose, Santa Clara, Milpitas, Sunnyvale, Campbell and Cupertino.
Services
What we fix and install
From a furnace that short-cycles on a damp January night to an air conditioner that cannot keep up during an inland heat spell, here is the work we handle for South Bay households, along with installs for those ready to move to a heat pump or mini-split.
- Technicians take measurements before recommending any part
- You see the options and make the call
- Visits end with written notes on what was found
About us
A service company built around the first question: what is actually wrong?
ClearSky Heating & Cooling works on residential heating and cooling equipment throughout San Jose and its neighbors. Every call begins the same way. A technician listens to what you have noticed, then checks the system with gauges and meters instead of guessing. Refrigerant charge, capacitor health, burner operation, static pressure in the ducts and temperature split across the coil all tell part of the story. When the picture is clear, you get an explanation and a set of choices: repair the failed part, address a deeper issue, or plan a replacement on your own timeline. Many South Bay houses have older attic ducts and equipment that has been patched more than once, so we pay attention to the whole system rather than the one component that quit. Homes in hotter inland pockets of the valley ask more of their cooling than homes near the Bay, and our sizing and repair advice reflects where you live.
More about how we workWhat to expect
How a visit goes
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Evidence first
Recommendations come from readings taken at your equipment, and we are glad to show you the numbers and what they mean.
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Your timeline, your decision
If something can safely wait, we tell you. If it cannot, we explain why, then let you decide how to proceed.
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Accurate rule and incentive information
We describe Bay Area Air District rules and current incentive programs as they stand, and confirm any offer before it appears in a quote.
Service areas
Where we work
Our technicians cover San Jose and the cities around it, including Santa Clara, Milpitas, Sunnyvale, Campbell, Fremont, Cupertino, Mountain View, Los Altos, Saratoga, Newark, Monte Sereno and Los Gatos.
What kinds of HVAC problems do you handle?
We repair and maintain air conditioners, furnaces, heat pumps and ductless mini-splits, clean and assess ductwork, and help with indoor air quality concerns. We also install new AC systems, furnaces, heat pumps and mini-splits.
Will I have to replace my working gas furnace because of Air District rules?
No. Bay Area Air District appliance rules do not require replacing working equipment. They apply when a furnace or water heater fails or is replaced. Gas furnaces manufactured from 2029 must meet a zero-NOx standard, which in practice points replacements after that date toward heat pumps.
Can I still claim the federal tax credit for a heat pump?
The federal 25C credit covered qualifying heat pumps placed in service before December 31, 2025. It is not available for installations after that date. Local programs through BayREN or your clean energy provider may still offer incentives, and we check the current offer before quoting it.
How do you decide between repairing and replacing my system?
We look at the condition of the failed part, the age and overall health of the rest of the system, how often it has needed work, and the state of your ducts. Then we present both paths with the tradeoffs so you can choose.
Why does my upstairs get so much hotter than downstairs?
Common causes include leaky or undersized ducts feeding the second floor, poor return air, attic heat soaking into supply runs, and equipment that is not sized for the home. A visit with airflow and temperature readings usually narrows it down.
Do you work outside San Jose?
Yes. We serve nearby cities in Santa Clara County and parts of neighboring counties, including Fremont and Newark to the north.
Should I replace my water heater now because of the 2027 rule?
The zero-NOx date for small water heaters under Rule 9-6 was set for 2027, and the Air District Board is considering amendments in November 2026 that could delay it. Check the current rule before planning a replacement.
Tell us what your system is doing
Describe the noise, the smell, the warm air or the cold rooms, and we will set up a visit to find the cause and walk you through your options.