Drying corn in bins has the benefit of a controlled environment, reduced spoilage and allowing for the use of natural air-drying. Corn harvesters can use natural air-drying for corn stored in bins using electrically powered fans to control humidity and temperature instead of heaters that burn fossil fuels.
Using bins for drying corn also allows harvesters to monitor and control the heat and humidity inside the bin. This helps prevent the growth of mold and fungus that leads to grain spoilage. As long as harvesters adjust the humidity in the bin to the humidity released by the corn while drying, and the bins have proper ventilation, very little spoilage occurs. Natural air drying in bins also prevents corn from becoming over-dried, as is common with most traditional heating containers.