Today many homes use solar energy for space heating. There are two general types of solar space heating systems: passive and active.

如今许多的家庭都采用太阳能供暖，其中有两种普遍的太阳能供暖形式：积极供暖与消极供暖。

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Passive heating and cooling with thermal mass and insulation, Geothermal, radiant cooling and heating along with solar and photovoltaic panels contribute to the house's energy efficiency.

采用保温隔热材料被动供暖和制冷，同时利用太阳能板和光电板采集地热能和光辐射能制冷与采暖，提高了房屋的能源效率。

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Also, new technologies for better home insulation and passive solar heating are readily available to reduce the energy needed for home heating.

而且，更好的房屋隔热和被动式太阳能采暖的新技术已经可以用于减少家庭采暖所需的能源。

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Nevada's first platinum-certified LEED (Leadership in Energy and Environmental Design) buildings stand proudly here, constructed of recycled materials and rammed-earth walls, with passive cooling, renewable heating, reclaimed water and solar-electricity panels, all harvesting clean energy.

BBC: Discover life in the Nevada desert