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A1 Sun, Inc

Home & Building Maintenance|Solar/Renewable Energy

5.0 | Closed


Kathleen Giustino is part-owner of A1 Sun, Inc. a family owned and managed solar installation company. Our team of design professionals and knowledgeable installers comes from within our local community. Our community is our customer base. Our customer base is our best advocate.

A1 Sun, Inc. installs solar systems of the highest quality. We are committed to providing the best value for our clients while benefitting the planet by doing business sustainably.We are easy to work with. From our initial sales contact to your first generated solar kilowatt hour (kWh), we make sure you are fully informed about your system.

We firmly believe in what we do. A1 Sun, Inc. is an Alameda County Green Business. We hold an A+ rating at BBB. We belong to the Solano Avenue Association, Buy Local, BNI, NARI, and the West Berkeley Design Loop.
Without individuals stepping up to reduce carbon footprints, climate change will be a reality we won't live with.
The world and future generations thank you for going solar!
Power for the People!

Why We're Green

We recycle cardboard, paper, steel, aluminum, copper, and plastics regularly. We also have drive a Nissan Leaf (electric car) which is charged at our office when doing site visits. We have one staff member who regularly runs errands on bicycle for small loads. The products that we install become carbon neutral after longer periods of time. We work locally only traveling small distances. We purchase enviromentally friendly office supplies whenever possible and are currently green certified.


Contact Us

(510) 526-5715 6

1455 Fourth Street, Berkeley, California

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8:30 AM - 4:30 PM


8:30 AM - 4:30 PM


8:30 AM - 4:30 PM


8:30 AM - 4:30 PM


8:30 AM - 4:30 PM