Demonstrating how to retrofit existing houses with solar, natural buoyancy ventilation, water tanks, and photovoltaics, this practical guide offers instructions on how to make one's home more comfortable while saving money on energy bills and addressing the causes of global warming. Perfect for homeowners, builders, and architects, this handbook provides simple modifications to create a sustainably designed residence. With photographs and helpful illustrations and diagrams, this book answers a variety of questions, including How can tenants reduce their fuel bills? How do we evaluate the results of retrofitting? and Is housing design going in the right direction?