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

A home energy assessment is a diagnostic test that evaluates the efficiency of your El Cerrito, Berkeley, San Rafael or surrounding area home, and pinpoints the areas that need to be improved to maximize your home's performance.

BESO Assessment

Hassler offers Building Energy Saving Ordinance (BESO) assessment service to homeowners and realtors in Berkeley who are looking to sell their house.

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.

Energy STAR

For homeowners in Oakland, El Cerrito, San Rafael and surrounding areas, the journey towards enhanced home performance can seem never ending. After all, there are countless different energy efficiency upgrades that can be made, and many people have a hard time understanding where to start.