The short answer
ClearSky Heating & Cooling repairs furnaces, air conditioners, heat pumps and ducts throughout Santa Clara County, from Palo Alto to Los Gatos and Milpitas. We test the system, explain what failed and let you choose the fix.
Santa Clara County is home ground for ClearSky Heating & Cooling. From our San Jose base we reach communities up to about seventeen miles out, across the valley floor in Santa Clara, Milpitas, Sunnyvale, Campbell, Mountain View, Cupertino, Los Altos, Palo Alto and Stanford, along the foothills in Saratoga, Monte Sereno, Los Gatos, Los Altos Hills and East Foothills, and up into Loyola and Lexington Hills. The valley may look uniform on a map, but heating and cooling needs shift noticeably from one end to the other.
One county, several microclimates
The Santa Clara Valley has a Mediterranean pattern of dry summers and mild, damp winters, yet inland and southern parts run hotter in summer than places near the Bay. A Sunnyvale or Mountain View home a short drive from the water may need modest cooling, while a house in Campbell or East Foothills can sit through long hot afternoons that test every component.
Foothill towns add their own wrinkles. Saratoga, Monte Sereno and Los Gatos see cooler evenings and more heating hours, and in Lexington Hills the higher, wooded terrain brings colder nights and outdoor equipment surrounded by vegetation.
Housing age and what it means for your system
Many neighborhoods across the county were built in waves decades ago. In those homes, ductwork in the attic or crawlspace has often outlived its insulation and sealing, and earlier equipment swaps may have left mismatched components. A repair that ignores the ducts can leave you with a running system and rooms that still feel wrong.
Newer construction and remodels bring different concerns, such as variable-speed equipment, communicating thermostats and ductless heads that need careful setup.
Problems we troubleshoot from Milpitas to Palo Alto
Requests across the county cluster around a familiar set of symptoms.
- Air conditioning that cannot hold the setpoint in late-summer heat
- Furnaces with ignition failures or burners that cycle off early
- Heat pumps that make loud noises during defrost or never stop running
- High humidity or dusty air indoors after renovations
- Breakers that trip when the outdoor unit starts
Our process and the rules behind replacements
A technician measures before suggesting anything: refrigerant pressures, electrical components, airflow and static pressure, and combustion on gas units. Findings come with options, and work begins only after you approve.
When replacement comes up, accurate rule information matters. Bay Area Air District rules do not require replacing working equipment, and furnaces manufactured from 2029 must meet a zero-NOx standard that favors heat pumps. Incentives through BayREN or your clean energy provider vary by funding cycle, and we confirm the current offer before quoting it.