Why is my room the coldest in the house?

 My room is the coldest in the house, i thought i was the only one who noticed until my mother brought it to my attention. Before i'm told it could be a closed vent, thin curtains, or not enough movement, im in my room most of the time. There's two rooms, the one i was in before was cold and the one i'm currently in was warm, then i swapped rooms and now this one turned cold and the other one back to normal. what can this be from?? Like i mentioned, my mother had noticed the rooms changed according to where i moved, cant think of a logical explanation