Thinking of switching to tubs for the winter.

[Outfoxed]

So I'm thinking of switching to tubs for the winter for my corn snakes since it get's rather cold here and I've been reading up on better ways to keep the heat in for them, then having to wake up every other hour to cheek on the temp and humanity levels. Does anyone have experience with tubs and what works best for you? I'm more concerned on the heat more then anything how I'm going to keep the heat in with out melting the plastic or over heating the tub. Help any one?