Almost everyone knows that leaving the refrigerator door open in the summer doesn’t, on the whole, make your house cooler. But did you know that in the winter you could use your freezer to make ice, store it in the ice-house for summer use, and make more ice you would be using the refrigerator as a heat pump and warm the house? This would make more efficient use of the electricity for heating than if you used that same electricity to heat your home directly with an electric furnace or baseboard electric heat. Part of the heat comes from the electricity used to run the freezer and the rest of the heat comes from the water you put in the freezer. You remove heat from the water, causing it to freeze, put the heat into the air, which raises the temperature of the air.
Plus, when you use the ice you stored in the winter the next summer you save on your summer electric bill as well.
Yeah, I know. What a geek. That what you get when read the blog of someone who thought their thermodynamics class was fun.