I have a couple of Coleman camping utensils that take the small propane canisters. I have about a dozen canisters in my supplies. Currently they are in my basement. It's cool and dry down there, for the most part (it can get humid, but we have a dehumidifier running). I'm a little worried that these potentially explosive canisters are in my basement. We do not have a garage anymore (my mother moved in with us and the garage was used in the addition for MIL quarters). We have a small barn, but it gets *really* hot out there in the summertime. Where is the best place to keep these?