My room's temperature

I like my room in my flat. It is nice and big. I have a very comfortable sofa. I can listen to the 2:04 race from highbury everyday from the sound of the bookies downstaris and i get woken up everyday by the sound of buses traveling at the speed of sound. There one thing that i have a problem with in my room and thats the temperature. It changes almost everyday. At the beginning of this week, my room was really cold and i put the heat on and i needed to keep the heat on. If i turned the heat off, my room would soon become in a matter of hours, freezing. But for the past few days, my room has been quite a nice temperature. The weather hasn't changed. Its been more or less 5 or 6C and sunny all week. I've been in the room the same amount roughtly so i don't think its my body temperature or fan-fan's always overheating temperature. I'm at a lost to fully explain the vast differences in temperature change. In my mind, i think the house is a monster and he has to open his mouth to expel all the bad gasses that build up in the flat(trust me there a lot). He does this of course in the beginiing of the week and as result he lets in all the cold air. His name, btw, is huggy. I have a feeling some people might not belive that is the reason. At least for the next few months, until summer arrives, i should hopefully be quite comfortable in my room