A-1 Guaranteed is a family-owned and operated business that serves Solano, Napa, and Contra Costa Counties with Heating and Air Conditioning, Solar, Tankless Water Heaters, Windows, Insulation and/ or Duct Replacement needs. As one of the premier service businesses in the area, we have helped thousands of satisfied, loyal customers improve the energy efficiency of their homes and offices.
We are available Monday through Friday and by appointment on Saturday. Our fast and efficient attention to your needs will prove our dedication to our customers is the foundation of our business. Our professional staff is knowledgeable and looks after your best interests when it comes to your environmental comfort needs. We are an Energy Upgrade CA participating contractor. We are honored that our customers consider us #1 in providing trustworthy service and dependable comfort.
Why Choose A-1 Guaranteed?
Voted best heating/cooling company for 10 years
Voted Best of The Bay for 5 years of KRON 4 TV
Commercial and Residential Installation
Angie’s List Super Service Award for 2 Years
Energy Upgrade Participating Contractor
Factory Trained Installers and Techs
All employees fully background checked for your safety
Drug-free Environment Enforced and Maintained
Better Business Bureau Honor Roll 20 Years
Diamond Certified Company
North American Technician Excellence (NATE) certified
Voted Best Construction/Heating & Air Conditioning by readers