The people behind every precise install
At Precision Heating & Cooling, your install isn't a number on a clipboard — it's a named technician who'll be back to service it. Meet the crew you'll meet at your home.
25+ years
in the HVAC trade
Guillermo Diaz
Owner & Founder, Precision Heating & Cooling
Guillermo Diaz founded Precision Heating & Cooling in 2000 in San Jose, California. With 25+ years in the HVAC trade, Guillermo personally trains every technician on the precise diagnostic-first approach the company is known for across the South Bay and Central Valley.
25+
Years in business
#1056688
CA contractor license
Bryant
Authorized dealer
More named faces, coming soon
We're rolling out individual technician profiles so you know exactly who's coming to your home. Until then, every Precision Heating & Cooling technician is hand-trained by Guillermo on our diagnostic-first process — the standard the company is named for.
Get a precise diagnosis from a named technician.
Same-day appointments across the Bay Area and Central Valley. Upfront pricing. Perfection Guaranteed.