Top bars ripped and placed. I rip all top bars to 450mm long and 38mm wide so I can easily exchange it between all my hives.
The horrifying top entrance! Many beeks seem terrified with top entrances saying that it lets the warmth out of the hive yet most try to make a top ventilation hole coupled with the bottom entrance which is causing VENTILATION !!! I dont think bees prefer ventilation! Top entrance helps contain all the natural occuring acid fumes from nectar gathering and it helps release excess condensation (especially during winter)
Bees dont heat the hive they heat the cluster. What they need is a solid wind break (tick wood) and relatively dry space. Top entrance provides this in my opinion.
I dont think this german skepist would have top entrance on ALL ;) his skeps ;) if they dont work well!
Photo from biobees