That’s not accurate at all. This time of year is great for crawlspace moisture control sure, but it sure is hard on the water pipes lol.
Vents open in the summer time doesn’t control crawlspace moisture what so ever, as long as your thermostat for the cooling season is below 78ish. And then it’s only a maybe but probably not, based on several factors such as crawlspace height and width, House design (front and rear porch) etc.
In theory you want your vents open when the dew point is less than the typical duct temperature, but above freezing.
You want them closed when the Dew point is above the duct temperature.
So when it’s humid and hot in summer, you want them closed, and you want them closed when it gets below freezing.
But you want them open some in the spring and fall when it’s not humid.
With our climate that can be a day to day change.
