YSK that using the bathroom exhaust fan to clear the steam in your bathroom after a hot shower wastes a lot of precious heat and humidity that most cold area homes desperately need in the winter. Consider cracking the bathroom door to let the steam into your house instead.
from /r/YouShouldKnow
YSK认为，在洗完热水澡后，使用浴室排气扇来清除浴室里的蒸汽，浪费了大量宝贵的热量和湿度，而这正是大多数寒冷地区家庭在冬季急需的。可以考虑将浴室的门敲碎，让蒸汽进入屋内代替。