A-1 Guaranteed’s Customer Testimonials

Here is what our customers have to say about us…

Your company is the best – this is my 3rd A-1 Guaranteed furnace – that says it all.

S. McDonald

Vallejo

As a real estate broker, I am called on to hire many different service contractors for my clients. There is an enormous difference in the knowledge, courteousness and professionalism of A-1 Guaranteed as compared to most other companies I’ve dealt with – you guys get the “Gold Star”!

S. Clare

Martinez

We can’t “thank you” enough for your kindness & professionalism of everyone. You were able to handle my personal needs & did so with grace. You were able to complete the project faster than anyone thought that it could be done! I can’t thank you enough!

S. Miller

Vallejo

They are friendly people, get the job done on time, you could not ask for better service

Charles Booker

Fairfield

We really appreciated the prompt service we received. They were prompt for every appointment, from the initial service call to diagnose the problem, to the actual installation. We are so pleased with their service that we have an annual service contract with them.

I.S.U. Saunder Jacobs

Napa

Bob’s initial visit, followed by Richard’s home assessment, convinced me this was the company I wanted for installing central heating in my home. The arrival of the 3 person team (Dan, Joe & Rick) were the “frosting on the cake!” Everyone is knowledgeable about their product and their duties. They acted in a professional manner at all times. By this I mean they were cheerful, took responsibility for their duties, were informative, enthusiastic, focused on the job yet flexible when necessary and demonstrated confidence in their work. Richard has built an excellent team and he is well organized and demonstrates a good deal of integrity.

A Satisfied Customer

I felt I was kept informed and updated on all scheduled appointments. A 2 hour window was very easy to deal with compared to 4 hour windows I have received from almost any other company I have dealt with in the past. Thank you.

Patty

Hercules

Joe, Tom & Bo installed our Trane system. They were very pleasant and easy to deal with. All were professional and left our home cleaned up. It was a pleasure to do business with them.

Teresa Waller

Fairfield

The sales representative (Bob) was very nice, prompt, took care of everything and checked back to see how everything went. Thank you. Joey was very nice and respectful of my house. He took care of everything, explained how to clean filters, etc.

Dorothy Arzadon

Vallejo

These fine folks know what they talk when it comes to furnace and a/c installations. They are prompt, diligent and highly professional in all manners of their work. Many thanks!

Doug Nelson

Why Choose

A-1 Guaranteed?

Family-Owned & Operated

Highly Experienced with Nearly 30 Years in Business

Heat Pump & Home Electrification Experts

Participating Contractor with Rebate & Incentive Programs

Factory Trained Installers & Service Technicians

Drug-Free Environment Maintained & Enforced

All Employees Fully Background Checked 

Voted Best Heating & Cooling Company for 19 Years

Voted Best of the Bay by KRON 4 TV for 5 Years 

Diamond-Certified Company 

Four-Time Angie’s List Super Service Award Winner

Better Business Bureau Honor Roll for 27 Years 

Certified Green Business

North American Technician Excellent (NATE) Certified

Call Today For a Free Estimate!

888-421-2473

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Solano County’s Best of 2024
Golden State Rebates
GoGreen Financing
18 Years Diamond Certified
HEEHRA Rebate
Comfortably California
Hero Registered Contractor
TECH Clean California
Kasey’s Klub
SMUD Participating Contractor
2022 Daily Republic Reader’s Choice
2018 Angie’s List Super Service
2024 Nextdoor Neighborhood Favorite
Solano County’s Best of 2018
Energy Upgrade California
BPI GoldStar Contractor
Bay Area Green Business
BBB Accredited Business
EGIA Approved Contractor
KRON 4 Best of the Bay
NATE
Bryant Factory Authorized Dealer
Diamond Certified