Another guinea pig cage problem?

Ok well i haven't decided on the cage yet but i hav decided where to put it. It is going in my bedroom and honeastly that is the best place to put it. The only problems are that if it gets too hot i seriously have to turn on the ceiling fan and idk if that would be like a draft but if it is how can i stop that problem. Also in the winter it can get rlly chilly in my room but thats the warmest room in the winter. Please help me!