The in-laws run theirs in "on" position. Have for years without a problem.
We run ours on "Auto" most of the time, but I have been known to switch it to "on" for various reasons. Sometimes we're in a noisy place, and the fan masks the noise quite well. Sometimes I have trouble sleeping, and the cycling wakes me up; with the fan on all the time, the sound doesn't change, and so I don't wake up every time it cycles. Of course, if it's hot, running the fan constantly helps keep the temps consistent, or at least they feel more consistent.
Like the others said, do what makes you most comfortable, you're good either way.
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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