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Old 07-27-2016, 09:12 PM
Machine Elf Machine Elf is online now
Join Date: Feb 2007
Location: Challenger Deep
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Originally Posted by watchwolf49 View Post
We have air flow past the ice cream ... and if that air is dry we'll continually be picking up water vapor from the ice, more so if it's already melting.
The ambient air will have to be very dry. According to the standard psychrometric chart, 90F air at ~12% relative humidity will generate condensation if cooled to 32F. So if your ambient relative humidity is more than 12% at 90F, then you're going to add moisture to your ice cream sandwich, rather than drying it out. There are places with humidity that low, but they're relatively rare.

If the AC's evaporator is only cooling the air to 40F, then it's not drying it out enough to prevent condensation when it's further cooled to 32F. Hope you like soggy ice cream.