The short answer
ReliableAir HVAC Services repairs furnaces, central AC, heat pumps, ductless units and ducts in Santa Clara County cities from Palo Alto to Los Gatos and Milpitas. We diagnose first, explain the problem plainly and work only after you approve.
San Jose is home base, but our service area spreads across the rest of Santa Clara County, with drives of up to about 19 miles. That covers the valley floor cities of Santa Clara, Sunnyvale, Mountain View, Milpitas and Campbell, the west side communities of Cupertino, Saratoga, Los Altos, Los Altos Hills, Palo Alto, Stanford and Loyola, the foothill towns of Los Gatos and Monte Sereno, and the Santa Cruz Mountains area of Lexington Hills, plus East Foothills above the east side of the valley.
How the valley's climate wears on equipment
The Santa Clara Valley has a Mediterranean pattern of dry summers and mild, damp winters. Areas closer to the Bay, such as Mountain View, Sunnyvale and northern Santa Clara, stay somewhat cooler, while inland and southern parts of the valley run noticeably hotter. A condenser in Campbell or Los Gatos therefore tends to log more hard hours each summer than a similar unit near the shoreline.
Winter is gentle compared with much of the country, so furnaces may sit unused for months and then get asked to fire on the first cold morning. That start-and-stop pattern explains a lot of early-season failures: dusty burners, worn igniters and flame sensors that need cleaning.
Common calls by area
These patterns are tendencies, not rules. Every call still begins with readings taken at your own equipment.
- Sunnyvale, Santa Clara and Milpitas: tract homes with original ducts, closet furnaces and add-on AC
- Cupertino, Los Altos and Palo Alto: remodeled houses where new rooms were tied into old duct systems
- Saratoga, Monte Sereno and Los Altos Hills: larger homes with several systems or zones
- Los Gatos, Lexington Hills and East Foothills: hillside homes with long runs and heavier heating use
- Stanford and Loyola: a mix of older and updated equipment that needs careful testing
Heat pumps, furnaces and what the rules actually say
Many homeowners in the county are curious about heat pumps. Under the Bay Area Air District rules, gas furnaces manufactured from 2029 must meet a zero-NOx standard, which points replacements toward heat pumps after that date. The rules do not require removing equipment that still works. The federal 25C credit ended for installations after December 31, 2025, so for current incentives check BayREN and your local clean energy provider, and we will confirm any offer before it appears in a quote.
Repair or replace in a valley home
When a system is older, the question of repair against replacement comes up quickly. We weigh the age of the equipment, how often it has needed service, whether parts are still made and how comfortable the house really is. A Milpitas condenser with one bad fan motor is usually worth fixing; a Cupertino furnace with a cracked heat exchanger is a different conversation. Either way, you get both options laid out plainly and time to decide.
Booking service in your city
Give us your city, the system type if you know it and what you are noticing. We schedule an arrival window, the technician diagnoses on site and you receive a short written report of the findings and the work done.