Onzone Heating and Cooling is a family run HVAC and refrigeration company out of Pleasanton. For 11+ years we have repaired, replaced, and maintained systems across the Tri-Valley, East Bay, and the wider Bay Area, in homes and in the restaurants and shops that cannot afford a warm walk-in.
No call center, no commission scripts, no pressure. The person who answers at 2am is a live dispatcher who can actually put a tech on your job, and the person who quotes your install answers for it afterward.
Oleg founded Onzone after years working as an HVAC and refrigeration technician across the Bay Area. The company started with one truck and a focus that has not changed: honest diagnostics, fixed-once repairs, and a phone that gets answered by a real person.
Today Onzone covers residential HVAC across the Tri-Valley and East Bay, plus commercial refrigeration and 24/7 emergency work Bay Area wide, as a licensed C-20 contractor (CSLB 1154419). The Google rating sits at 5.0, earned one honest job at a time. We do not chase reviews, and we answer every one, including the rare critical one. The values have not moved since the first truck: show up fast, fix it right, charge what we quoted.
