Hi Holly
They do like a lot of room, I only have indoor chipmunks, and all but one aviary is floor to ceiling in height. They are quite small animals, but boy do they make use of space, I think mine would start to get depressed if they could not come out for their run every day. Most of the time chippies are very active, like little fury racing cars, very agile, excellent climbers and good jumpers. When mine are in their aviaries they seem to prefer to be up high, even though they are supposed to be ground feeders.
Perhaps if you have the room you might consider building an aviary in the corner of your room, it may work out cheaper than buying one.