Sorry to hear that you are selling you entire colony. As far as the heat goes, I think it really depends on where you are shipping to. I see that you are in Alabama. If you are shipping to somewhere that is really cold, then you may want to ship with a heat pack. Otherwise, I think most would agree that dubia are VERY hearty and will survive. I have heard stories from Ian (at The Roach Ranch) about roaches that have been shipped and were exposed to the cold, then were warmed up slowly and did just fine. The best advice I can give you is to make sure you insulate them well with crumpled newspaper. If you ship them somewhere that is very cold, then ship with a heat pack just to be sure.