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Hi WWest,
With low humidity, sub freezing vent temp should be fine. Freezers work that way. The t-stat to keep from freeze up is only to deal with humidity. Some are adjustable, and you could have whatever vent temp you want within the capacity of the heat exchangers.
Dave
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Dave McKenzie
1984 Carrera 3.2
1984 928S Automatic
2001 996TT
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