When I lived in a duplex with my daughter, the landlord installed an actual stacking washer and dryer in the kitchen. This allowed sufficient water pressure and electrical power to run a full sized washer and dryer, thus allowing the machines to run efficiently, unlike my previous all-in-one or portable models. However, since it was on a inside wall of the duplex, the dryer couldn’t vent to the outside.
If you ever read that a dryer can operate vented or ventless, beware. Ventless really just means that all the damp air is vented into the room where the dryer sits. In the small apartment we occupied, this meant into all the rooms. I imagine that in a very arid place such as Arizona, it might be beneficial to have all that humid air circulating. However, this was Portland and we didn’t need a drop more of humidity.
So for the several years we lived there, the apartment had a lingering odor of moisture, approaching mildew. If we had wanted to grow mushrooms, we had the right environment. Unfortunately, it always felt like we were never quite dry. Thanks, ironically enough, to the dryer.
Saved By Words 
Yes, it always has to vent outside, or else you learn the hard way that it isn’t wise. We’re trying to figure out the structure in the house we have only lived in since summer, and there are plenty of odd venting things going on here.
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We live in a 1929 house and found many half-baked fixes here. We have been dealing with them for 17years and still find new quirks.
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I made that mistake once while young, and just starting out. I thought I could warm the apartment a little, while the clothes dried. You couldn’t see out of a single window.
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To say nothing of the little bits of dryer lint everywhere.
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Not a problem, they all stuck to me.
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😂🤣😂🤣
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My sister had this situation when she lived in a small house in Cape Town. The moisture caused certain moulds to grow and she developed asthma. They had to move in the end.
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I think it contributed to my daughter’s asthma also. We also moved.
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