A system that relies on the natural phenomena of energy (radiation, convection, and conduction) for the transfer and storage of heat or "coolness." Some basic elements of a passive solar system are south-facing glazing for solar collection and thermal mass for absorption, storage and distribution.

a design that allows for the entrapment and transfer of heat from the sun to a building without the use of moving parts or machinery

a non - mechanical solar heating and cooling system

A solar system in which the building structure itself collects and stores directly the sun's energy and distributes the resulting heat by natural means.

A solar heating or cooling system that uses no external mechanical power to move the collected solar heat.

A system that supplies solar heat without the use of electric fans or pumps.