Question

When a window is accidentally left open on a winter night, will you feel uncomfortable because the cold is getting in, or because the heat is escaping from the room?

Answer 1

If a window is accidentally left open on a winter night, you will feel uncomfortable because heat will start to escape from the room.

We know that the heat always flows from body at high temperature to body at low temperature. The room being hot as compared to outside cold air. Thus, the heat will flow from the room to outside window, leading to a decrease in the temperature of the room.