The heat absorbed from sunlight through a building's roof may be used to increase indoor temperature, thus lowering the requirements for a heating system in cold weather. However, one must notice that there is an opposite need in hot weather, where it's better to increase the reflectance of roofs to prevent heating indoor spaces. Effectively absorbing and using heat from the roof has other challenges: hot air rises (making it difficult to heat lower parts of the house); and, snow may accumulate on roofs (preventing absorption of sunlight).
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