Getting Wire into frige?

Good suggestions all. I added a fan using the light switch contacts and it worked fine. The thermistor wire chase is a great idea. I've heard of using the condensate drain too, and hence my caution. Sure we don't want to plug it with additional wire. But... Some condensate drains have a bend in them that's meant to create a water "trap." What the trap does is prevent loss of cold air down the drain. Counterintuitive but apparently critical, so I take it seriously. So if you put a wire up there, please preserve what otherwise looks like a kink.