Diamond Certified
click here to see how we earned it
Voted best heating/cooling company for 8 years by readers of The Vallejo Times Herald
Commercial and Residential Installation
Energy Upgrade Participating Contractor
Trane Comfort Specialist
We are rated 98.1% in Trane Customer Satisfaction
(Other dealers in our Distributorship were rated at an average of only 92.3%)
Owners are 4th generation Vallejoans
Factory Trained Installers and Techs
All employees fully background checked for your safety
Drug-free Environment Enforced and Maintained
Better Business Bureau Honor Roll 15 Years
Diamond Certified Company
North American Technician Excellence (NATE) certified
Voted Best Construction/Heating & Air Conditioning by the readers of the San Francisco Chronicle and SFGate.com
Bay Area Certified Green Business
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A-1 Guaranteed is a family-owned and operated business that serves Solano, Napa, and Contra Costa Counties with Heating and Air Conditioning needs. As one of the premier service businesses in the area, we have helped thousands of satisfied, loyal customers install, repair, and improve their HVAC systems in their homes and offices. We take care of installations and repairs and service all major brands of furnaces and air conditioners.

We are available Monday through Saturday, and 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 the recipient of numerous awards for customer service and hold many memberships in prestigious organizations, and are honored that our customers consider us #1 in providing trustworthy service and dependable comfort.

Click on the icon below to view an informative online presentation about achieving a more energy efficient home.

Be sure to visit our this page on our website for more information regarding our EnergyUpgradeCA Program.

Richard Hiteshew
Energy Upgrade California