The disadvantage in winter is that the apartment freezes and the heating system may fail. But this is a proposal of complete absurdity, since the window is installed no more than 3 hours. During this period of time, even the smallest apartment will not have time to freeze, it only refreshes her freezing air, which after a couple of hours to rise to room temperature. And the fact that the pipes will freeze, lodge, t. To. They are filled with hot water. These modern boilers support the constant temperature in the pipes, which is ridiculous to hear about their freezing.