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General Information
Business Hours are 8:00 AM to 5:00 PM Monday – Friday and Saturdays by appointment.
Office will be closed the 3rd Tuesday morning of each month for company-wide training.

A-1 Guaranteed Phone Numbers
TOLL FREE : (888) 421-2473
Vallejo : (707) 645-0734
Fairfield : (707) 421-8782
Contra Costa : (925) 609-8800

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A-1 Guaranteed Heating & Air Conditioning
1768 Broadway St. Vallejo,
CA 94589

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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