"I'm curious (new beekeper this year). It is my understanding that feral hives often use an entrance hole maybe the size of a quarter, give or take a little. If a beekeeper's hive has a screened bottom board, why open the entrance all the way?
the idea of beekeeping is to help the bees do better than a hollow log so they will produce more honey than they need to survive/multiply. this is our "surplus". the idea of ventalation is to have a flow of air, thus carrying out the hotter air that gets trapped in the top of the hive. this is why many recomend some upper ventalation regardless of screened bottom. the bees will create this flow without help by sitting outside and fanning thier wings or just by keeping thier own body heat out of the hive- but these bees are not foraging for nectar or doing chores inside the hive.
"Wine is a constant proof that God loves us and loves to see us happy" Ben Franklin