Hello! I recently lucked on to some cheap wine coolers for sale on craigslist. Having acquired two identical wine coolers, PigsNPythons (Jordan) and I are planning to turn them into an incubator. The dimensions on the outside of the wine cooler are 24.2 x 22.4 x 31.9 inches. I know we want to run flexwatt down the length of the back of the wine coolers. My question is, should I get 4 inch or 11 inch flexwatt for an incubator this size? Thanks!! If you need more info on the size I am talking about, the wine coolers are Haier model HVFM20ABB.