Heating, Plumbing & Air Conditioning in Contra Costa County Since 1974

We’re here to improve the comfort, safety
and health of your home and family.

Heating, Plumbing & Air Conditioning in the Bay Area

Air Conditioning

Call us when you need affordable & dependable air conditioning service in Contra Costa County, CA


We can expertly maintain, repair, service, or install heating systems. We service all brands and models.


Our professional plumbers have years of experience working on home kitchens, bathrooms, pipes and drains.

Home Energy Audit

We are a Home Energy Audit company with a focus on whole home energy efficiency.

Serving California home & business owners since 1974!

Dedication to the highest quality of customer service. Delivered with a sense of integrity,  friendliness, individual pride, and company spirit.

Since 1974 Stewart Heating and Air Conditioning has been dedicated to providing the best HVAC solutions for your needs, including commercial, industrial & residential heating and air conditioning in Contra Costa County. We do our projects right the first time and it shows, as our company is built on referral business. In 2008, approximately 65% of our business was from referrals. This enables us to focus on quality, and installing heating and cooling systems that work the first time, every time while meeting your unique design requirements.

If we don’t provide what you need and want, we’re not doing our job. Our employees are trained to ask questions and find out what your specific desires are, and then to see your job through from start to finish – ensuring your 100% satisfaction. We offer upfront pricing so you know exactly what you’re paying for. We are a green focused company, and provide home energy audits to help our customers move to more efficient homes.

Plumbing Repair

plumbing repair coupon
$50 OFF

*Not valid with any other offer

Free Duct Leakage Test

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One per household.

*Not valid with any other offer

$1,000 OFF

heat cool coupon


high efficiency HVAC system

*Not valid with any other offer


Bryant Factory Authorized Dealer

When choosing a dealer, look for the Bryant Factory Authorized Dealer symbol, which means your dealer has met the highest standards for superior skills, service, and a promise of 100% satisfaction guaranteed.*

It takes reliable service and technical know-how to stand out, and all our dealers do Whatever It Takes® day in and day out.

*100% Satisfaction Guarantee is good for one year after installation date. Due to ongoing supply constraints, Evolution controls may not be available at time of equipment installation, and dealers may install temporary, substitute controls. Consumer non-satisfaction resulting from the temporary controls shall not be subject to the 100% Satisfaction Guarantee. Evolution equipment shall be subject to this Guarantee once the communicating control is installed. See dealer for details.

How Your Home or Business Can Benefit From An Energy Audit

Part of our indoor comfort control solutions are home energy audits, for identifying areas where you home can be more efficient. This protects our environment, and protects your wallet!

Benefits of Scheduling an Energy Audit

home energy audit