I fitted my smaller 8x8 overhead with a screen. At the top corner in a
small hole...bee escape...where the bees go out, but most can't get back
in. I know one beekeeper who places a nuc next to this opening.

I also know of a beekeeper who uses "negative air pressure." He uses a fan
to draw air from inside the honey house and blow it outside. He claims this
causes negative pressure at all the cracks around doors and windows, and
the robber bees can't smell the honey...except at the fan, which is tightly
screened. Have I got it right, Rick?

Mike