heating & air conditioning services
Diamond Certified

Sales Service Installation

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(707) 645-0734Vallejo

(925) 609-8800Contra Costa

Serving Solano, Napa and Contra Costa Counties
CA License # 719381

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Voted Best Heating/Cooling Company for 10 years by Readers of The Vallejo Times Herald
Voted Best of the Bay for 5 Years by KRON 4 TV
Commercial and Residential Installation
Angies List Super Service Award for 2 Years
Trane Comfort Specialist
Factory Trained Installers and Techs
All employees fully background checked for your safety
Drug-free Environment Enforced and Maintained
Better Business Bureau Honor Roll 20 Years
Diamond Certified Company
North American Technician Excellence (NATE) certified
Voted Best Construction/Heating & Air Conditioning by the readers of the San Francisco Chronicle and SFGate.com
Bay Area Certified Green Business
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A-1 Guaranteed Heating & Air Conditioning
1768 Broadway St. Vallejo, CA 94589

Heating and Cooling in Contra Costa

A-1 Guaranteed is the premier provider of Contra Costa HVAC services. We always deliver more than just excellent service — we deliver comfort, security, and savings with every project. We offer warranties for five years on parts and labor, along with a 100% money back guarantee for our customers. Through our reliable service and years of experience, we've worked hard to earn our reputation as the very best HVAC professionals in the area. From water heaters and windows to air quality and solar energy, we provide a variety of services to make sure you and your family are happy, healthy, and comfortable all year long.

HVAC Maintenance & Repair in Contra Costa

A-1 Guaranteed is unique; our technicians are not only expertly trained, but they also participate in ongoing education and training throughout their careers to ensure that our customers always receive the very most up-to-date, advanced, and accurate service. We perform dependable service and repairs on all major models and brands, and encourage our customers to have us come out once each year to perform a maintenance check-up on their Contra Costa HVAC systems; this way, they're able to enjoy comfort and safety that lasts for years. Our professionals are able to take on any task, whether it's large or small, residential or commercial.

Contra Costa HVAC Installation

At A-1 Guaranteed, we're able to customize the perfect system for your needs, whatever they may be. Whether you need a smaller system for a small home or an industrial system for a large building, you should know that the safety, satisfaction, and comfort of our customers is always our number one priority. We will always deliver absolute 100% satisfaction with every installation, every repair, and every product, and we can meet any design requirements.

Every new installation is always done according to local code regulations, and we permit each installation we perform. No one else delivers the quality of service we do that is backed by years of service and our strong, hard-earned reputation. When you need heating and cooling in Contra Costa, you need A-1 Guaranteed.

Home Energy Upgrades in Contra Costa

We've helped thousands of customers throughout the area with more than heating and cooling in Contra Costa; we offer a broad range of services that cover windows, insulation, tankless water heaters, HVAC maintenance, repair, and installation, solar energy services, air quality testing and improvements, and more. Our staff is knowledgeable and always has the best interests of our customers at heart. We've earned several certifications and awards over the years, are Diamond Certified, and are on the Better Business Bureau Honor Roll. A-1 Guaranteed is also an Energy Upgrade CA participating contractor. You can always contact us for a free estimate on any of our services; we're here for you, serving Solano, Napa, and Contra Costa counties.