Serving Berkeley, Oakland, and Alameda, Contra Costa, and Marin Counties!
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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

thermal imaging inside building

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

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

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

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.

Not quite sure what your home needs to stay more comfortable and efficient?

We can find the answers for you.


Schedule Service

With Purchase of a new HVAC System
Keep Everything Running Smoothly to Save You $$$ Down the Road
Convert both your gas furnace and gas water heater to a heat pump and heat pump water heater at the same time and get $2,500 for your old equipment.
Keep Your Home Healthy!
Home energy audit credited upon installation with Hassler
with Heat Pump or Heat Pump Water Heater Conversion
Apply for financing today!


Keep CO Out of Your Home

Carbon Monoxide Monitor
Monday, December 28, 2015

With wet winter weather rolling into the Bay Area, homeowners are going to be spending a lot more time indoors.

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