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.

Other locations and Services offered by A-1Guaranteed

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Water heater in Oakland

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Water heater in Berkeley

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Water heater in Cordella

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Water heater in Walnut Creek

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Water heater in Pleasant Hill

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Water heater in Green Valley

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Water heater in Richmond

Why Choose A-1 Guaranteed?

  • Voted best heating/cooling company for 16 years
  • Voted Best of The Bay for 5 years of KRON 4 TV
  • Commercial and Residential Installation
  • Angie’s List Super Service Award for 4 Years
  • Energy Upgrade Participating Contractor
  • Factory Trained Installers and Techs
  • Drug-free Environment Enforced and Maintained
  • Better Business Bureau Honor Roll 24 Years
  • Diamond Certified Company
  • North American Technician Excellence (NATE) certified
  • Bay Area Certified Green Business
  • All employees fully background checked for your safety