Bay Area summers are getting longer and hotter. The system you put in this year decides what your July electric bills look like for the next 15 years. Onzone installs central AC and replacement systems sized by Manual J, not by rule of thumb.
Free quote, written line-item proposal, NATE-certified install, manufacturer warranties registered the day we leave. We pull permits everywhere we work.
Rooms stay warm on hot Tri-Valley afternoons because the current equipment cannot meet the home's calculated cooling load.
The AC starts and stops constantly, leaving humidity, noise, and uneven temperatures while wearing out major components early.
An older condenser or air handler needs frequent repairs, uses more energy, and is no longer worth rebuilding.
Weak airflow, hot bedrooms, or restrictive ductwork prevent a new AC from performing unless the system is properly evaluated.
Oversized AC short-cycles, dehumidifies poorly, wastes energy. Manual J load calc gets the tonnage right the first time. Bay Area inland homes need a 2.5 to 4 ton system depending on size, insulation, and orientation.
Most residential AC replacements finish in a single day. Larger or zoned systems take two. Either way you sleep in your own house that night with the new system commissioned and running.
Most homeowners do not realize unregistered warranties default to a shorter term. We register every install the day we leave. Your 10-year parts warranty is actually 10 years.
Most residential AC replacements land in the $7,500 to $14,000 range depending on tonnage, brand, and whether ductwork needs work. New ducted installs in homes without existing AC start higher because of duct and electrical work. We write line-item proposals so you see exactly what each component costs.
Most replacements finish in 6 to 10 hours over a single day. Zoned systems, ductwork replacement, or electrical service upgrades add a second day. We schedule the inspection separately, usually within a week.
Carrier, Lennox, Trane, Mitsubishi (inverter and mini-split), Daikin, Goodman, Rheem, and York. We are not a single-brand shop. The right brand depends on your budget, efficiency goals, and what is in stock locally.
For most Bay Area homes, yes. A heat pump handles both heating and cooling on a single system, qualifies for thousands in rebates, and runs efficiently in our mild winters. See our heat pump installation page for the full breakdown.
Yes. We pull permits in every Bay Area city we work in (Pleasanton, Dublin, Livermore, San Ramon, Danville, Fremont, and the rest). The permit is included in the install quote, not an add-on surprise.
