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Home Energy Audits

Stewart Heating, Plumbing & Air Conditioning is a Contra Costa HVAC contractor who serves both residential and commercial customers with industry leading indoor comfort solutions. We build on the foundation of equipment from manufacturers who dominate the industry, and we bring years of extensive technical experience to each job we do. 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!

What is a home energy audit?

You can purchase high efficiency equipment for your heating and cooling needs, but if your home is not an efficient home, you could be wasting your money on those high-end products. Home energy audits are performed using testing tools such as infrared cameras and blower doors. We determine the areas that your home can be improved, and layout a recommended action list to make it happen.

Up to 25-40% of the heating energy in some homes is lost due to air leaks! Whether it be in your ducting or home construction, we can help you turn an inefficient “leaky” home into a solid, efficient structure. We don’t stop with energy efficiency, but also cover the health of your indoor air with IAQ products that refresh, purify and protect the air you breathe!

Serving Contra Costa County: Alamo, Antioch, Brentwood, Concord, Martinez, Oakley, Pittsburg, Pleasant Hill & Walnut Creek

67ee38a9a78c5c3ba52cdf9e_energy-audit-thermographic-inspection.webp: A hand holds a thermal imaging camera, displaying a colorful heat map of a house on its screen, indicating heat loss or gain. The house in the background is a traditional, multi-story home with brown balconies and white siding, under a clear sky.

Infrared Energy Audit

We use thermographic scans to measure temperatures using infrared cameras. These tools see light that is part of the heat spectrum, and record temperature variations. Thermographic inspections can be both internal and external surveys, however internal surveys are typically more accurate, depending on the situation. Thermographic scans are another important part of our home energy audits!

A white, corrugated hose with a blue nozzle sprays white, fluffy insulation into an attic. The insulation is visible as a stream from the nozzle and accumulating in piles on the floor and between wooden studs of the attic framing. The framing consists of several light-colored wooden beams and studs, forming a skeletal structure.

Home Insulation Installation

Home energy audits uncover issues that are causing your home to lose efficiency, and sometimes insulation is required for attics and walls to reduce energy loss. Blown insulation is often an excellent choice – especially when insulation is needed in walls due to its non-destructive nature. We know how to navigate blocking in walls so the insulation is done correctly, bringing you maximum benefit!

A bright red fabric frame, secured in a doorway, houses a large, yellow, circular fan, which is centered in the lower half of the frame. The fan's opening is black with several circular cutouts. Wires from the fan lead to the top of the frame.

The Blower Door Test

If you haven’t heard of blower door testing, it might sound a bit strange, but it is an important part of our home energy audits. A powerful fan motor is mounted in an air tight door frame, and used to exaggerate air leaks in your home. This is done by moving air from the home, which reduces the internal air pressure. This forces outside air to come in through holes and cracks.


A horizontal banner ad features two men and one woman. In the upper-left, a man in a red collared shirt with a "Bryant" logo on his chest points to an open brochure held by a man and woman. The man and woman, seated side by side on a couch, are looking at the brochure and smiling. The man wears a tan polo shirt, and the woman wears a light purple button-up shirt.

Energy Efficiency Upgrades

If you’re ready to progress towards a more efficient home, allow Stewart Heating & Air Conditioning to do a home energy assessment! We will use innovative technology to outline the areas of improvement your home requires to be more energy efficient. We back our recommendations with industry best services to implement them.


A stylized, cutaway illustration of a multi-story house, showcasing its interior rooms and various energy-related systems. Solar panels are visible on the blue roof. Inside, different rooms like a bedroom, living area with a television, kitchen, and bathroom are depicted. An outdoor AC unit is visible on the right side of the house. In the top right corner, there's a blue and white "PG&E" logo. The house is set on a green lawn under a blue sky with white clouds.

California Energy Rebates

California inspires the nation with our best environmental practices across a wide range of applications. With our State’s “green” focus comes a plethora of rebate incentives from utility companies. These rebates encourage homeowners to have more efficient homes, which has an ongoing, positive affect on our environment. Stewart Heating, Plumbing & Air Conditioning keeps you up on the latest incentives!

A cream-colored rectangular HVAC unit with a "bryant" logo prominently displayed in a red rectangle on its front. The unit has four circular silver duct connectors on its top surface. A blue Energy Star logo sticker is visible on the bottom left corner. The background is a soft, light grey.

Indoor Air Quality

Something that goes hand in hand with home energy audits is in fact indoor air quality. Addressing the “leaky” aspects of a home without addressing air quality needs can actually be harmful to your family’s health! Stewart Heating & Air Conditioning is an expert at installing indoor air quality solutions that will refresh, protect and purify your indoor air — all while protecting home efficiency!

A high-angle shot captures a male technician, wearing a red polo shirt and khaki pants, kneeling on a green lawn while performing maintenance on an outdoor Bryant air conditioning unit. He is connecting blue and red hoses from a set of gauges to the unit's service ports. An open red toolbox is on the grass, containing various tools including a yellow multimetre. A pair of work gloves is also visible beside the toolbox.

Heating & Air Conditioning

Once you know your home is sealed well and conserving energy, the next step can be to assess your HVAC system. If you have equipment that is over ten years old, this will also impact your utility bills. Modern air conditioners, furnaces and heat pumps offer two-stage motors, variable speed fans, quiet operation and very high SEER/AFUE ratings. Staying comfortable has never been this nice! Call us for an estimate at (925) 203-9141.

A technician in a white polo shirt with a company logo is crouching down and pointing to a white, wall-mounted carbon monoxide detector, explaining something to another man in a light blue long-sleeved shirt who is also crouching and listening attentively. Both men are looking at the device. The setting appears to be indoors with a light-colored wall and a wooden floor.

Carbon Monoxide Testing

Though our bodies produce carbon monoxide naturally, too much of it is poisonous. If there are carbon monoxide issues in your home, this needs to be addressed immediately. We install carbon monoxide testers that use enhanced sensors to keep you on the alert. Carbon monoxide can come from a variety of things including furnace, fireplaces, gas stoves and more.

Schedule an Energy Audit

Stewart Heating, Plumbing & Air Conditioning isn’t your average HVAC contractor. In addition to all of the normal HVAC related tasks like maintenance, repair and new installations, we offer home energy audits to help identify and remedy energy loss issues you could be experiencing.

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