You don't appear to have any games that have real backglasses, so I would worry about humidity more then heat. If you don't have one already, I would just pick up one of these:
http://www.amazon.com/Frigidaire-FAD504DWD-Energy-50-pint-Dehumidifier/dp/B00AU7GYXA/ref=sr_1_1
Just set the desired humidity percentage and leave it on. It will keep the balance.