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 A1 Sun, Inc.
Solar Installation and
Energy Storage Design
and Installation

(510) 526 - 5715

1455 4th St., Berkeley, California 94710

Monday - Friday 8:30AM - 4:30PM (PT)

January 2007, Larry, Kathleen Giustino and Paul Cooper incorporated A1 Sun, Inc. Our goal is to install superb, affordable photovoltaic solar energy systems to benefit our neighbors, our community, and the larger global environment - one unique roof at a time.

A1 Sun is “local,” serving our East Bay community. Constantly improving our installation practices, we maintain a BBB A+ rating and garner high internet reviews. Certified an Alameda County Green Business in 2007, we continue to use environmentally benign products and reuse/recycle as much “stuff” as we can.
We hire, train, and support our own A1 Sun crews. Working in the community, each crew member represents the core values of our company. Each takes pride in their work installing solar to highest standards to actualize homeowners expectations. A1 Sun strives to  install the best, long lasting solar systems!

A1 Sun belongs to: BBB, Berkeley Chamber of Commerce, Buy Local, West Berkeley Design Loop, Gilman District, Sierra Club, Solano Avenue Association, Alameda County Green Business.
If you own property and are considering a solar powered home or business, please contact A1 Sun. We offer a free site evaluation and work closely with each homeowner to find the perfect kW size and price point for the ideal system.


Please fill the contact form on our website or reach out to us at 510.526.5715.

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