 Have you ever wondered how a frost-free refrigerator works? Well, in the old days, you had two sets of coils, one in the freezer, one in the refrigerator, and put a pan of hot water in to melt the frost off. Well, a frost-free refrigerator uses the same principle in that there's a coil behind the freezer wall. It's similar to the one that's found in a window air conditioner. But what it does is the coil gets cold, a fan draws air through it, goes half in the freezer, half in the refrigerator. And the coil still frosts up like it used in the old days, but this is how a frost-free refrigerator works. A defrost timer turns electric heating element on, similar to this one here, and it gets hot, melts the frost off the coils, water runs down the back in a little plastic pan underneath, and evaporates. And now you know how a frost-free refrigerator works. Look for more Frith Quick Tips on YouTube.