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What is the difference between passive and passive solar?

Passive and passive solar refers to the building design. Passive is more advanced in its building design as it has super-insulation and a structure that can hold heat when its cold and can keep the house cool when its hot because it is a built system that does not depend on the sun. Passive solar also collects heat from the sun but it leaks air. The key difference is that Passive systems holds the heat and keeps the cool while the Passive Solar System is dependent on the sun and leaks air.