Many new homes and commercial buildings now incorporate solar energy designs for space heating purposes. These systems rely on thermal mass materials to conduct and store energy, which is then released into living space when it is needed. Passive solar energy design is premised on the fact that heat naturally moves toward colder surfaces. Thus, in buildings that employ solar energy technology, solar energy first heats the air, and then is absorbed by the cooler floors and walls. As the sun sets and the room temperature drops, the stored heat seeks out the ambient cold temperature, thereby heating up the room.
More mass equals more passive solar heating potential.
A common design incorporates a greenhouse structure installed on the building's southern end. The structure is built over a thick concrete slab, which serves as the heat absorbing mass. Experts must determine how much southern facing glass, and thermal mass, are required for your particular installation. They must also determine the extent that the solar system will have to be supported by another kind of heating system to ensure year round comfort. Over the years there have been various government initiatives aimed at encouraging the installation of solar heating technology.