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OUR SERVICE AREAS

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

A-1 Guaranteed Emails

Service
service@a-1guaranteed.com
Maintenance
maintenance@a-1guaranteed.com
Free Estimates
estimate@a-1guaranteed.com
Marketing & Personnel
marketing@a-1guaranteed.com

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

Contact us Today

Why Choose

A-1 Guaranteed?

  • Voted best heating/cooling company for 13 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