Our Mission Statement: Your family’s comfort and safety is our family’s priority

Since A-1 Guaranteed began as a business, we have grown to be one of the most trusted heating and air conditioning service businesses in the areas of Solano, Napa, and Contra Costa Counties. We have gained experience and knowledge from putting our name on thousands of installations and repairs, and our customers gain from our working knowledge of the latest technology in heating and air conditioning.Our reason for existing is the basis of our company philosophy: We work to provide service to our customers. Looking after the best interests of our customers in a professional and fair manner is what sets us apart from other businesses in the industry. We pledge to always be courteous, fair, thorough, and professional in every service we provide.

It is this pledge that has enabled us to grow as a family and expand as a company over the years. We are licensed by the state of California (License No. 719381) and hold that license as a true privilege and a testament to our reputation as a premier provider of indoor comfort.


The A-1 Guaranteed Team

A-1 Guaranteed Owners

Community Wall and
Donation Station

Solar Install

Factory Training

Company Training

Efficient Procedures

Precise and Accurate Testing

Company Training

Service Team

Air Flow Testing

Hands On Training

Install team

Lineset Training

Hands on Training

Factory Representative Training

Company Training

Company Training

A-1 Guaranteed Office Staff

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    Why Choose

    A-1 Guaranteed?

    • Voted best heating/cooling company for 14 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
    • Drug-free Environment Enforced and Maintained
    • Better Business Bureau Honor Roll 20 Years
    • Diamond Certified Company
    • North American Technician Excellence (NATE) certified
    • Bay Area Certified Green Business
    • All employees fully background checked for your safety