I'm surprised no one has suggested using an arduino, a temperature/humidity sensor, and a relay board to convert this 1.77 L/kWH unit with a defective humidistat to an smarter device. If you don't want to play with 120V via relays, you could just insert a "power switch tail" and hardwire the compressor to run when the tail is triggered ON, although admittedly the power switch tail is not inexpensive.
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