Garden Atriums are all designed to be “Net Zero” resource users. First, list each aspect, such as heating, cooling, power, water, etc. Second, balance what comes in and goes out until you reach zero. (For example, add winter heating losses and gains. Then reduce losses and increase gains until you reach zero … 100% passive solar heating.) Third, plan for storage, as it may rain at 3 am when you don’t need water, but may be sunny at 8 am when you do. “Net Zero” means living – on an annual basis – with what comes to your site. It’s actually not difficult to do.