The basement is fine as long as it' s not damp. My basement is bone dry plus I have a dehumidifier down there. Best would be where you live and it' s air conditioned. Don' t store it in a tightly closed closet that is on the outside wall of the house. They can get hot in the summer because there is not AC in there. I would NOT store it in a completely closed up case. You want air to get to it. Things could sweat in a tightly closed case if you have temperature extremes and high humidity.