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Well, if I am not mistaken, all appliances produce heat. Have you observe this phenomenon if you use your laptop for a long time, the device gets hotter right? That's a proof that all appliances produce heat and you can feel it especially when it is used for a very long time. Here are some examples of appliances that produce heat: Electric fan, Air conditioner, oven , Rice cooker, Blender, Mixer, Electric Iron andvetc.