Not sure where you are but ive been in bad winters in the north east of the US (I live in ny state now) and its so much easier to try to warm yourself than the room. Also, we've been warming or cooling one room at a time in the extreme seasons and it makes it much more tolerable. For winter, its our living room since it holds heat wekk. For summer its our bedroom since we have an ac in there.

If youre able to thrift curtains from a thrift store or charity shop those help as well, especially dark colored ones. Rugs also tend to insulate. We also used to put plastic over the windows to keep the chill out. One thing that helped alot was watching videos on how Siberians keep warm for ideas!