Most of their energy goes to heating and cooling, and a lot of it is wasted, as warm and cool air escape through fireplace chimneys and thin or poorly fitting windows and doors, and because of inadequate insulation.

大部分能源用于取暖和制冷，其中许多被浪费掉，因为冷暖空气都通过壁炉烟囱以及过薄或安装不合适的门窗，或者由于绝缘效果不好而流失掉了。