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this post was submitted on 13 Aug 2023
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I'm a layman but from what I've read recently, 92 to 78 is 14 degrees; the typical temperature differential is a maximum of about 20. There may be a few more degrees you can eke out, but you are getting a majority of the potential benefits
There really isn't any such hard limit on systems like that.
While correct, you usually see only a 20 degree difference, that’s between the intake and exhaust. Since it’s recirculating the air that should be able to bring the cooled air down further.