Yes you can. What snakesRkewl was trying to tell you is to put heat tape on every shelf, wire each shelf with its own plug, then you have a powerstrip hooked up to the thermostat, and when you need the shelf thats not being used to be heated all you do is plug it in. So every shelf will have its own heat tape, and its own plug. Only the used ones will be plugged in. Same as if you were using heat mats, or heat cables, one per shelf with its own plug hooked to a power strip hooked to the thermostat, plug and unplug as needed. I hope I made sense and didn't come off as confusing.