Oh no, could that thing be a host for a legendary Copeland scroll compressor? We are all doomed!
I once built a big dehydrator out of an old dishwasher. It used the existing heating element and klixon thermostat. I rigged the drying vent to stay open, and natural convection did the airflow. It worked pretty well, but used a whole lot of energy.
I believe you will need some air exchange for faster drying time. Sure, the evaporator will catch some moisture, but I believe by running intake air by the evaporator while it is still cool will do a good job of lowering the rh inside the box. Exhausting moisture laden warm air is how retail units do their jobs.
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