Roosting pockets are best in a sheltered place, preferably facing south or east, out of prevailing wind that could drive rain into them. They should be fixed to a firm surface like a post or a tree trunk (using the wire clip provided), not swinging free in the wind. Choose to leave either the large entrance hole or small entrance hole facing out, as that will allow smaller or larger birds inside. Don't leave it with both holes open, as this could allow a through draft.