It'll take me a long time to fill a 10-12 slot rack with snakes. Single mom of 3, remember? I make minimum wage. How do the economy racks retain heat? I have one of the racks from Reptile Basics and it's great. We keep our house cold in the winter and before I got the rack I had the hardest time keeping their cages warm. They were in tanks and then they were in tubs but not in a rack. Until I got the rack I was struggling to keep their temps up.