Auto-translated
The first three points Revan mentioned are familiar to me, but despite that, I like winter.
As for my legs and arms, there are some possible solutions. When I sit still for a long time, my legs also start to get cold, even if I'm wearing two pairs of socks. In reality, movement helps, as it gets the blood flowing to my legs. I wrote about my hands in the chat.
As for the heating... it seems like the walls around the windows weren't properly insulated, if I'm not mistaken. I'm not sure if replacing the radiator/windows will help.