I put top entrances on two of my hives two days ago built as shown. Reduced lower entrance to 1 inch. Came home that afternoon (95 Degrees, 78% humidity) to find both hives packed with dead sticky bees filling the lower deep. I do not know if they could not figure out how to get out or what the issue was. Pretty sure they overheated due to the packed and tiny lower entrance.
Might wait until its cooler and less ventilation is required so they can adapt.
I wish I had.
Perhaps a larger entrance at the bottom until they figure out the top entrance is there?