My room is at a comfortable temperature, and sometimes even gets a bit cold. (I live in the basement) I am supposed to have an under-tank heater, but it hasn't arrived yet. For the mean time, I have it propped up over a space-heater with the temperature on low, and it heats the cage really well. I think that you could have an AC, especially if you have a heater that heats just the cage- not your room.