I don't think the ambient temperature will be too much of an issue come summer when the AC runs for 12+ hours a day. Right now it will only run for maybe an hour a day, if that. My backup plan is to run 6" flex duct to the nearest window and exhaust the heat from it.
For now I bought a couple one liter bottles i'm going to freeze and put in during the hot part of the day to see if I can maintain 70 ish on the temperature without cooling it too much.
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