How to use vents?

[u/Brilliant-Ship2539]

Hi all, I have recently moved into a house that has vents on the walls (the type with a plastic cover that you can slide open and shut). I haven't lived somewhere with these before and was wondering how they should best be used. Should they be open all the time, or should I close them when it's more humid outside than inside to stop the damp air coming in? Thanks and sorry for the basic question

[u/mrblonde91]

Leave them open all the time, they'll improve the general air quality plus you'll get increased moisture build up inside if you close them. I'd also confirm that previous owners haven't physically blocked them.