@HotAndHumid, this is how bad the coil in my 70 pint a day dehumidifier was. I never realized that any maintenance aside from cleaning the filter was necessary. When it started to produce more heat than normal, and wasn’t working very well on lowering the humidity in the room, I read online that that it was probably because the coil was dirty.
Sure enough, this is what I found on the coil when I took it apart, and it worked great as soon as I cleaned it.
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