Condenser or even more efficient heat pump non-vented dryers internally recover moisture that it is then expelled by the drain system. This method is slower than the directly heated and exhausted air of vented. My position is purely that of time from start to finish and that there isn't a venting limitation if mounted outside, so I would pick the shortest cycle time vented provides.
Everything You Need to Know About Ventless Dryers - Reviewed.com Laundry
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