Ideally, you don't want heat, but the dry is good. And 70-80 is far from extreme heat. I wouldn't worry much about it.
I stored my childhood collection in a Wisconsin bedroom closet next to the garage that got extreme changes in conditions. Wisconsin is cold in the winter (goes without saying), but also hot and humid in the summer. And my cards survived fine. I think the way the cards are holdered and stacked has more influence on future condition than the climate. Now, if you lived in the Amazon jungle...
Last edited by drcy; 09-05-2017 at 02:28 AM.
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