1, winter is the low temperature season in Kunming, especially at night, the balcony is not closed, and cold air will enter the room through the balcony, which will lead to the decrease of indoor temperature and make people feel cold.
2. If the balcony is not sealed, the indoor heat will be quickly lost, and the heat generated by heating or other heating equipment will escape through the open position of the balcony, which can not maintain the indoor temperature.