At A-1 Guaranteed, we’re proud to serve homeowners across Northern California with reliable heating and cooling installation, repair, and maintenance services.
Since 1996, our family-owned team has helped thousands of families stay comfortable while lowering energy bills and reducing their carbon footprint with energy-efficient HVAC systems. We specialize in electrification solutions, including heat pumps and heat pump water heaters, that save you money on your energy costs and get your home ready for gas bans.
Cities We Serve
We’re based in Vallejo and proudly serve homeowners throughout the Bay Area, including Alameda, Solano, Napa, and Contra Costa Counties. Here’s a closer look at the communities we serve.
Solano County
- Benicia
- Dixon
- Fairfield
- Suisun City
- Vacaville
- Vallejo
Napa County
- American Canyon
- Napa
Alameda County
- Alameda
- Berkeley
- Emeryville
- Oakland
- Piedmont
Contra Costa County
- Antioch
- Brentwood
- Concord
- Danville
- El Cerrito
- Lafayette/Orinda
- Martinez
- Moraga
- Oakley
- Pinole
- Pittsburg
- Pleasant Hill
- Richmond
- Rodeo
- San Pablo
- San Ramon
- Walnut Creek
Yolo County
- Davis
Why Homeowners Across Northern California Choose A-1 Guaranteed
We’re proud to be the HVAC company Northern California homeowners have trusted with their heating and cooling needs since 1996. Here’s what sets us apart:
Family Owned – We’re a multi-generational family business that treats your home like our own.
Experienced – Nearly 30 years of installing and servicing HVAC systems throughout Northern California.
100% Money Back Guarantee – If you’re not satisfied, we’ll make it right or your money back.
Heat Pump Experts – We specialize in energy-efficient heat pumps to prepare your home for gas bans and rising energy costs.
Rebates & Incentives – We help you claim rebate savings that other contractors can’t offer.
Get a Free Estimate for Your HVAC Installation
No matter where you are in Solano, Napa, Contra Costa, Yolo, or the Bay Area, A-1 Guaranteed is here to help with energy-efficient heating and cooling solutions. We install high-efficiency heat pumps, ductless mini splits, heat pump water heaters, and more.
