There is no one effective solar window screen option that is available in California. However, some good options include those from the SolarWindow Company or Solar Treatment. The SolarWindow Company offers reliable, affordable solar window screens that can be used in any location within the state. The Solar Treatment line of solar window screens is designed to be the most effective and reliable option available. They are made with special adhesive tips that allow them to easily adhere to and clean solar panels, making them very effective.