HVAC Installation in San Jose, CA
A new system here will heat from November through May and cool from July through September every year. Tell us about the house, and a licensed contractor who covers Santa Clara County will get in touch.
Tell us about the job
It takes about a minute.
Ten months of the year, your system is working
Winter nights here average 39°F, and homes still need heat from November through May. That's seven months. Add cooling from July through September, when afternoons average 82°F, and a system here runs ten months a year with barely a break between seasons.
A new furnace or heat pump has to meet the federal minimum efficiency rating in place at installation, and with most homes in the county heating with gas, that rating matters over seven months of use, not just a cold snap. The condenser outside won't see extreme heat, but it runs through three straight months of it every summer. This area has also logged 257 damaging wind events over the past ten years, along with 3 winter storms. A system that keeps running through that, or comes back on by itself when the power returns, matters here.
- 7 months
- November through May, your system heats
- 3 months
- July through September, it cools
- 39°F
- the average winter night it heats against
- 82°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
California requires HVAC contractors to hold a state license.
The license is issued to the contractor and the business, not to each job. It covers the contractor's work in general, so it stays in place across every furnace, air conditioner or heat pump they install.
For this installation, that license is what backs the work. Alongside it, most cities and counties in California require a permit for a heating and cooling installation, and an inspector checks the finished work before it's signed off. That inspection comes from the local building office, not the state board, and it happens after the state's requirement of a license is already met.
Sources: California Legislative Counsel · Contractors State License Board
- When should I replace my HVAC system?
- Replace it when repairs stop making sense, either because the same part keeps failing or because a single repair costs too much next to a new system. An older furnace or air conditioner working hard is more likely to fail at a bad time than one that's newer. Homes here need heat or cooling 10 months of the year, so a system on its way out doesn't get much rest to hide the problem. If a contractor keeps coming back for the same issue, that's usually the sign it's time.
- Should I replace my furnace and air conditioner at the same time?
- If both are old, yes, it's worth doing together. A furnace and air conditioner installed at the same time are matched to work as one system, and replacing only one can leave the other running against equipment it wasn't sized for. It also means one visit instead of two, and one round of duct and airflow checks instead of separate ones later. If one unit is much newer than the other, a contractor can tell you whether it's worth keeping for now.
- What happens during an HVAC installation?
- A contractor removes the old furnace and air conditioner, or whichever unit is being replaced, and sets the new equipment in place. They connect it to the existing ductwork, electrical, gas line, and condensate drain, then check the refrigerant charge and airflow before running the system through a full cycle. On a furnace, that includes checking the vent connection and testing the ignition and burners. The job ends with the contractor confirming the thermostat controls everything correctly and walking through what was done.