Hassler truck with person doing peace sign out window

At Hassler, we see the house as singular system with everything from the furnace to the insulation working as one unit. Our home performance experts are capable of diagnosing problems in your home and finding comprehensive and lasting solutions. If you are looking to improve your home performance with solar panels, an energy assessment, high efficiency windows and more, give Hassler a call for a whole home solution.

Energy Assessment

Looking for an energy audit company near you? An energy assessment from the team at Hassler will determine if air sealing the attic, insulating the basement wall, or upgrading your appliances will have the most impact on your energy bills. Hassler provides energy assessments throughout California's East Bay.

BESO Assessment

If you're a homeowner or realtor planning to sell a home in Berkeley, you'll need to schedule a Building Energy Saving Ordinance (BESO) assessment before selling. Hassler is a Registered Energy Assessor and offers fast and reliable BESO assessment services for homeowners and realtors in Berkeley.

High Efficiency Windows

Improve the aesthetics of your home with new double pane windows, and increase your energy efficiency while you're at it! Hassler is an experienced window contractor and installer who can help with your next home upgrade project in El Cerrito, Berkeley, Albany, Oakland, and Richmond, CA.

Attic Platforms

Utilize your attic for storage without damaging the insulation of your home with an attic platform. Hassler heating and air installs Attic Platforms for increased attic storage and home performance in your El Cerrito, Berkeley, Walnut Creek, Mill Valley, and the rest of California's East Bay.