I'm not sure about the hay balls, we use a wire rack that hangs on the side of the cage, but it really seems like a waste. The boys will pull all of the hay out and then eat it off the bottom of the cage.
We have 3 chillers in the cage at all times. One in their house that they sleep on, they don't like to sleep on the fleece. One right by the door, they sit there to give us the stink eye and beg to come out or get treats all the time. The other one is on the shelf under their hammocks, they refuse to sleep/sit on the hammocks, but instead sit under them and use them like hanging blankets. I"m always worried that they are going to overheat themselves being cuddled up under the hammocks, that's why there is always a chiller there. They use all three all the time, even with the ac cranked up for them. We also always pull one or two of the chillers out and throw them in the freezer during playtime.
