We live in Idaho and buy 50# boxes for $8-12 a box at potato processing plants nearby. We store them in our storage room that is dark and cool, that is in the basement. Covered in Burlap to keep light away from the potatoes which if exposed to light they will turn green. We live in the high desert area so our basements are dry. I would find the coolest part of your home. Our boxes last 6-8 weeks and there are just two of us now.
I've never met a potato dish I didn't like, however my husband isn't as crazy about potatoes as I am, but I'm the cook and he doesn't complain. It's been my experience that potatoes this time of year start sprouting 'eyes' quicker than the newer potatoes during the Fall, soon after harvest. I make sure to knock the eyes off as soon as they start, if you don't then the potatoes start getting mealy/soft.