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[–]FormosaOolong 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (3 children)

Probably mold. It's the last thing you'd want to be growing inside your unit to spew all over your house. This is also why it's essential to run an AC on fan only for 20-30 mins before you shut it off, so that any condensate on the coil evaporates.

[–]magnora7[S] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (2 children)

This isn't the part that draws in air though. It's just the part that gets rid of the heat. So even if it filled with mold it wouldn't affect the air supply. The air that you breathe is re-circulated within the house only. But that's a good point about the mold. I guess (I would hope) it would dry out between runs, when it shuts off for 30 minutes or whatever.

[–]FormosaOolong 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

Yes, that's true. I'm not an engineer of any kind, but my lame user inspections of my two units (mold makes me sick so I peek in there a lot) indicates that the only thing separating the indoor recirculating parts and the outdoor bits where the outlet fan is, is a thick piece of styrofoam. I would hate to have mycotoxin creep.

Of course the box outside is exposed to all the elements, and includes channels that with the correct pitch ditches the water it accumulates. So there's no reason I guess they couldn't make some kind of misting system that repurposes the water eliminated from the indoor space. I'd pass on that model myself though, as I'm already OCD with my current units.

ETA: All that said, you still may have a million-dollar patent right there!

[–]Tom_Bombadil 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

The inside coil causes interior air to condense. If this condensed moisture doesn't drain adequately, or if it evaporates again then it can remain humid and mold can build up.

You could add a fan with a timer for ventilation, similar to what you find in bathrooms (a daily timer).