My old rat room was in the basement and temps pretty much self regulated for the most part down there. I have since moved and now am going to be building a rodent room in the back of the garage. Should be everything I could want, big sink for cleaning, charcoal filter exhaust. I am trying to figure out what might be the best way to heat and cool the 15 x 15 room. Energy efficiency is my main concern and a close second is getting a unit that won't be affected by the dust. I have killed a few dehumidifiers from the dust sticking to the wet coils, so a filter is almost necessity I would assume. I was wondering if anyone has already has done a little research on this an had some input.