I heat mine to perfect temperature during the hottest part of the day, then drape it every; night with a thick towel just around the seam keeping the vent holes and fan holes free. This works for me. The fluctuation in room temperature is what you are battling. I am using a Little Giant (or three) but I'm pretty much tired of the hassle with keeping the temperature even.I have warmed up theincubator and left it over night but found it dropped to below 30 C over night, how can I stop that happening?