I use the Hovabator cover with an x-large styrofoam box that you may find in the streets (from frozen meat shipments). Just cut a beveled opening for the cover to fit, and pre - test the temps for your needs. If your cover doesn't have the fan attached, you can buy it separately from the mfgr. and wire it up yourself. It's very simple and mfgr. will send instructions. I only use an incubator with BP eggs. Colubrid eggs go au natural, but you get bigger babies. mike