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I think I would mount the switch on the top of the box instead of the inside and forget the heat sink, the top of the box will act as a heat sink. Mounted as is, it could melt the wires with no air moving. Another way for audio warning would be to hook up a 120 volt buzzer or piezo, one...

Good idea and nice work. How about adding a piece of heat resistant insulation inside the box fastened to the door, that should increase its efficiency some. Also using an insulated blanket (like the ones used to cover rapid cure concrete which are weather resistant) to wrap the entire generator.