Hey Fairfield and Vacaville!

A-1 Guaranteed is one of the best HVAC repair and installation companies with 5-star reviews on Yelp and Google, and a glowing “A rating” on Angie’s List! Our team is a family owned and operated business that serves the Fairfield and Vacaville in California. We offer a wide range of services that include 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.

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