High outside temperatures do not bother the bees, because they regulate the temperature in their hive independently by heating in winter and cooling in summer. For cooling, they apply a film of water to the combs and use their wings to move the air. In this way, they keep the temperature in the brood chamber constant to a few tenths of a degree, regardless of whether it is -30°C or +40°C outside.

This measurement shows how well the natural temperature regulation in the brood chamber works.