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Your Fall HVAC Checklist for Contra Costa Landlords

Are the furnaces in your rental units ready for cooler weather? Autumn brings with it some welcomed cooler weather to California, which means that it’s once again time to start …

Using Gas vs. Electricity for Your Home

Historically, appliances in the home have relied on natural gas as their main energy source. However, as the costs of natural gas continue to rise, residents of California are seeking …

Top Reasons Why Your Air Conditioner is Dripping

There are more than 100 million homes in the United States that have air conditioning systems, and sometimes, these systems can leak water inside the house and outdoors. It’s not …

MERV and HEPA Filters: What’s the Difference?

If you’re a homeowner or small business owner, you’ve likely heard the acronyms “HEPA” and “MERV” before in discussions about furnaces and HVAC systems. Don’t let the two acronyms cause …

15 Fun Facts About Air Conditioning You Never Knew

When you think of an air conditioner, or heating and cooling in general, “fun” probably isn’t the first word that comes to your mind! And that’s ok, we get it; …

Top 5 Ways to Tell that It’s Time to Replace Your Home’s Windows

Windows are one of those things that many people just don’t think too much about on a day-to-day basis. They might get cleaned or decorated every so often but other …

Is It a Good Time to Purchase a Tankless Water Heater?

You may be at a point in your homeownership when you are questioning whether a tankless or traditional water heater would be the better investment for your home. There are …

Top 5 Tips to Beat the Heat Indoors (And Save on Your Cooling Bill)

It won’t be long now before summer heat waves really hit California and with that heat will come air conditioning units working overtime. Undoubtedly, it will also mean that many …

5 Ways Buying a New HVAC System Can Save You Money

The initial thought of purchasing an entirely new HVAC system can be daunting; however, it’s a part of owning a home that everyone at some point or another must deal …

A-1 Guaranteed Heating & Air, Inc. and What It Means to be a Certified Green Business

Local public agencies, non-profits, and Bay Area businesses can be Green Certified by the Bay Area Green Business Program. Coordinated by the California Green Business Network, this certification is available …

Top 5 Tips for Getting Your A/C Ready for Spring

A little preventive maintenance before spring blooms can go a long way when it comes to the longevity and performance of your outdoor air conditioner in California. It won’t be …

Why Home Insulation Isn’t Just a “Winter Thing”

There are a lot of things that need attention whenever the seasons change. From covering and uncovering your A/C unit outdoors to storing outdoor furniture for winter and bringing it …

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

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