I live in northern IL. an it gets cold. I thought about a walkin incubater in my garage. You might want to raise the floor. I would put down a vaper barrier(plastic sheet)on the concrete then 2x4 framed floor with fiberglass insulation.Then topped with 3/4 Plywood. Don't forget the door threshold. I like the two oil filled heater idea. Have one temp set just a little lowwer than the other one in case of a failure. One should be plenty if the room is insulated well.Two heaters set at the same temp would go on at the same time and thats alot of amps. If you blow a fuse that would be awful. Good luck

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