passively heat the house英語(yǔ)作文

　　in cool climates special attention is given to the use of building materials that have a high “thermal mass”. insulation is used on the outside of heavy materials such as concrete, brick or adobe. this kind of material stores heat and slowly releases it while external insulation ensures that all heat absorbed by the wall materials is released inside the building. careful positioning of the building and large windows facing winter sunlight also assist to passively heat the house.

　　the roof has an extreme angle to assist with snow runoff and roof overhang does not interfere with sunlight.

　　homes in warm climates require the opposite approach. insulation and reflective roof material aims to keep heat from the sun out. windows are placed under a wider roof overhang so that they are shaded from direct light in the day and so that cooler night air can move through the house when the windows are open. construction materials such as wood and steel have low thermal mass and gain and lose heat quickly.

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