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Passive solar design and construction has been used to collect heat from the Sun for centuries. Old buildings, for example, often contain passive solar features such as strategically oriented south-facing walls, large windows, and masonry walls that collect and distribute the heat from the sun. Using these techniques can result in more energy savings in the long run. Active solar energy examples include solar thermal collectors, which use absorption of sunlight to produce heat. These devices can be used for decades without requiri... more