What sort of volume are you trying to target? If it's in the few dozens, you can probably reverse engineer a few window A/Cs, pick one that's easiest to convert, then devise a setup for quickly doing the conversion.
More than that and it would start making sense to start looking at custom designs.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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