Simplest is best, esp in colder climate where you can use the added indoor humidity.
I simply route the dryer vents (have 2 dryers) to a box with a furnace filter, dump the heat right back into the room - work with electric dryers only for obvious reasons.
Never had had a problem with high humidity or condensation. Dryers are in the basement, more sawdust down there than anything that would get past the furnace filters.
Summertime: solar dryer outside <G>
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