As long as the corn has a hot spot that's not too hot or too cold (82-84F or so), so they actually use it, it shouldn't be a big issue if temps get down to the low 70's ambient wise.
In my experience with corns, over 85F or so, and they will avoid it. Low 70's is probably too cold to easily digest though. So make sure the hot spot is really dialed in and there shouldn't be any issues.
Corns are pretty hardy animals.
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