A-1 Guaranteed’s Customer Testimonials

Here is what our customers have to say about us…

A-1 recently installed my ducted heat pump system. They were one of the most professional contractors I have worked with. The initial person who did the walk-through was very knowledgeable and answered all of my questions. The team that installed was also very professional, taking the time to walk through options for arranging the ductwork in my attic. I would definitely recommend using them, and will keep them in mind for future work.

Daniel T

Erick the tech called me and let me know he was running a few minutes late. I appreciate the courtesy. He checked out our furnace and installed the IWave air purifier. He did a great job and fully explained everything to me. I highly recommend A-1 Guaranteed!

Marcel G

Because of the heat waves and the fires in the last several years, we decided to have air conditioning installed and at the same time replace our 30 year old furnace. After receiving estimates and presentations from 4 companies we decided to go with A-1 Guaranteed. The presentation was very professional and the proposal quite competitive. Every question was answered and all of my requests were, in fact, granted. Installation was done in a day by a very skilled crew of technicians. The new system and its operation was thoroughly explained to me and it works perfectly and, in fact, we have saved tremendously in PG&E costs during the first month of operation. The testing and the permitting went smoothly and without a hitch. The whole experience has been stress free and, in fact, quite informative and enjoyable.

Steve G

We have been an A-1 Guaranteed customer for six years. We have been very satisfied with their work and service plans. Our past furnace service was done by a technician named Jacob. He was very courteous, knowledgeable and professional. Once the work was completed, he thoroughly reviewed his service report. He was by far the best in taking the time to walk me through his findings by showing me pictures of the very items associated with the report. In a way, this gave me an understanding of what’s going in our attic. If possible, we will try a by-request to have him perform maintenance/service next year. Scheduling is very flexible and easy. Thank you A-1 Guaranteed!

Richard B

We have been customers with A1 for over 25 years. Each job and upgrade they have completed for is is handled perfectly. One furnace had an odd vibration that just could not be locate. One day the installer shows up and says he has an idea what was causing vibration. He did his magic and found the problem, a simple fix was the answer.
Today Brian came by for the semi-annual checkup. He knows where everything is. No issues. Will see him in December. A-1 Guaranteed is the best there is and they are a longtime local business that does a lot in the community.

John R

The installers were polite – the way it “use to be”, even though they were younger. I thought the younger generation lacked the respect we were taught and they showed us otherwise – thanks.

S. Jarden

Concord

This company from top to bottom is first class all the way – I must have had 8-10 other quotes and the people that came out were very disappointing. From your sales estimator to the gentleman who installed my furnace I couldn’t be happier. Your company is absolutely outstanding in every phase – there isn’t another company that even comes close – Thank you very much. I wish every company was like yours – you set the standard what a company should be like – absolutely top notch.

K. Freigen

Concord

I think your company and installers are “Tops”. Wish all jobs I need could be as good. I have already recommended you to all my friends who will need your type of services in the future.

E. Sillin

Napa

Very knowledgeable people. I was really impressed when the owner himself came out the day we signed the contract. He changed a few items i.e. a bigger unit at no additional cost to us. The house was very clean when they left. My only regret was not going through them directly; however I have no qualms with Home Depot. Thanks everyone for making our home a place we look forward to coming home to on a hot day.

A. Alvey

Concord

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

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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