Ours are kept in the kitchen in a tub with ventilation holes in the top, on top of the dresser, so are at room temperature. We put a small amount of food in for the crickets in a smaller tub placed in the big tub and then each night we scoop some crickets out, put them in a smaller tub and gut load overnight with food ready to be fed to the Beardies the next day.
Just remember though that any kind of damp will kill them off.
Another important thing is to remove any crickets left in there at night. They really are the most vile nasty things lol and have been know to start eating babies in their sleep!!!!!!