Kathleen Giustino - A1 Sun Inc.

Solar Design & Installation

We founded A1 Sun, Inc. in 2007 to install the highest quality photovoltaic and thermal systems for residential and commercial clients. We were accredited an Alameda County Certified Green Business our first year. We have earned an A+ Better Business Bureau rating. We belong to the Berkeley Chamber of Commerce, “Buy Local” and the West Berkeley Design Loop as well as ASES and Nor Cal Solar. We hire and work locally.

A1 Sun’s staff offers 80+ years of combined design, engineering, and installation experience. Call us for a complementary site evaluation and we will develop the optimal system for your home or commercial project.


Phone: 510-526-5715

Email: kathleeng@a1suninc.com

Website: http://www.a1suninc.com