在小雪期间，室内供暖已经开始了。
主动式太阳能系统还可以用来提供建筑中的室内供暖。
Active solar energy systems can also be used to provide space heating in buildings.
个人洗浴用水占家庭总用水量的33%，而热水则是继室内供暖之后的第二大家庭能源开销。
Personal washing accounts for around 33% of the water used in the home and hot water is the second largest consumer of domestic energy after space heating.
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