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If you get an expensive one with both in and out ventilation through the window it can be good. But you’re spending a lot more than just a window AC at that point. The cheap ones actually vent your cold air outside.
I got a couple of $150 cheapo units at the big box stores to supplement our central air during heat waves, have been just fine. 5k or 6k BYUs at least.
This is correct, you need a “ closed” loop of outside air (by this I mean, the unit does not vent inside air through the condenser coils to the outside) and the two-pipe units are the only way to achieve this.
If you go that route, be aware that these usually collect the evaporator moisture and you either have to manually empty the bucket or pump it to a drain (you can connect it to a laundry machine drainpipe for example). If that isn’t possible and your indoors isn’t sealed well you might be emptying it a lot. Still, there are situations like smaller basement windows for which this is the only practical solution.