For heat control for summer.
Turn blinds up or down for privacy.
When the blinds are tilted down they could look pretty aesthetically but they provide less privacy as it creates larger gaps between the slats.
With the blinds facing up the inside appearance may not be as appealing as when they re down but you reap greater privacy benefits.
However having the rounded side facing out may not be as aesthetically pleasing as when the rounded side of the slats faces in.
With the slightly rounded side facing out and the concave side facing in you have better light control in the room with the blinds up than if you were to turn the blinds to face down.
Blinds turned down it may make it easier for peeps to peep in.
This may be a good strategy for the winter when you want to warm the room.
It gives you better privacy.
When the blinds are tilted up they allow better light control in the room.
When the blinds are turned up the rounded side faces outward.