This may be of use to you, another member on the site had developed a system for keeping feeders in the Garage:
http://www.frogforum.net/food-feeder...ore-after.html

Heat Tape or UTH(s) and quality means of insulation will be the ticket. You could apply a similar strategy to that of this member - maybe use a large bin that can house smaller bins within it (one for crickets and one for fruit flies) that has some kind of insulation around it confined within the larger, exterior box/bin...