Looks like you have decent conditions in your house for archiving B+W materials. I'd store it there. If you plan to use up the paper within a 2-3 years timeframe from purchase, I would not bother freezing them either. If you go the desiccant route, be sure they have a color indicator. I found that even in heavy duty ziploc bags they saturate within two weeks. And that's indoors at about 45-55%. I did not try heat sealing bags though, results may be better.