It's all solid except cooling to 25F; it also heated up to 87F on the sides. Now if I had ten of these cool mugs in a row; All ten heat the house or room to keep it warm. I might try that next winter if I'm still alive! To set the temperature, just turn off a few. Do you put a fan behind it to disperse hot air? You can also chill ten cans of beer, soda, or water.
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