In Hangzhou, apart from air conditioning, what should be used for heating in a room of about 16 square meters in winter?

If air conditioning is not considered, the best way is to use electric oil. You can obviously feel the heat near it, which can improve the overall room temperature. The price of 2000 watts is not expensive. You can buy an electric blanket when you sleep at night, turn it on half an hour in advance, and hit a low gear when you sleep. In Hangzhou, normal winter nights can basically be closed.