Hope you can help.
In our last place we had a cupboard under the stairs with hanging bags of potatoes, garlic and onions, and they lasted ages.
In our new flat (which is much smaller) our potato cupboard is in a small kitchen next to the radiator. They don’t seem to last long without sprouting.
DH says we should move all the dry goods and potatoes to the cupboard nearer the window and swap them with the fancy wedding crockery. This seems like a ball ache. 
My thoughts are, do potatoes need to be kept in a cool place? If so, what are the options for a small flat which has the heating on full blast for 6 or more months of the year? Any tips?