I am keeping the cage for future use with her when I move out. I live with my mother and grandparents, me and my mother share a room. (Not fun being 20 and sharing a room with your mom)
I had spot on temps with the bigger cage, I adjust wattages and my thermostat to meet ideal temps.
The 20 gallon has front doors while the 40 didn't which also provided some issues as well. The dresser I had was so tall that I couldn't get into the tank from the top without using a stool.
I'll be saving money for a 36" long exo terra which has the from opening doors in the meantime, as well as try to work something out with my family as to where I can put her. They don't want her outside my room so I'm going to have talk to them about that. I want to give her the biggest space possible, I just have to find the right place first.