I have 4x2x1H cage with 11: flexwat but already I am having to run a space heater to keep the ambient up. It will cost a small fortune to do this all winter (I'm in the NE). Some people say rhp will help and others say it doesn't do more than a few degree for ambient temps. Can someone with experience in colder climates chime in? If the RHP will work (it gets cold here, like 60F if I don't run the space heater)., how do I make a hole big enough for the power plug but not have escapes, maybe fill it in with foam sealer? Also would a rhp/flexwatt combo be redundant, maybe just use one?