Passive solar design strategies use the sun’s “free” renewable energy to reduce your home heating costs. In a passive solar home, windows, walls, and floors are specially designed to collect, store, and distribute solar energy in the form of heat in the winter and reject solar heat in the summer. This approach is called “passive” because it can require no special technological or mechanical devices, just smart design and quality home construction. Note, however, that varying degrees of energy-efficient mechanical systems can be integrated with passive heating and cooling strategies to enhance the effects. Please check out our “Sun Smart” Radiant Heating and Renewable & Efficient Energy Systems pages to learn more about these methods.