Like many others, I leave them open when not in use camping. Hot/humid or otherwise, I would think air exchange is a good thing.
One interesting point....and not one I'm sure makes a difference or not....I close the vents while on the move. I'm thinking the less banging around and bumping there is on the hinged vent cover the better. With a rear kitchen unit, one learns about "bumping around" the first trip out.
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2015 Freedom Express 246 RKS (Sold 2021)
2021 Grand Design Reflection 150 295RL
2016 Chevrolet Silverado 2500HD Z71 LTZ
Days camping previous years: Not Enough
Days camping in 2021: Still Not Enough
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