The nest box has limited space to minimize bees energy waste for environment conditioning. When the colony (and their... our food reserves - we trade honey I need for sugar they depend on in winter so that they do not need to fly out to poop and freeze to death) occupies all space, I slap another box on top of column of boxes that is their home. To help them start and guide their work, I attach wafers of cast wax molten from old frames to new wooden frames. They build honeycomb there from sweat of young bees, that's whar wax is. I do not know yet how exactly that affects temperature, but I think that honeycomb construction noise is just too loud, and also with more surface area to dry honey they have easier time air conditioning.

Bees are amazing. They allow you to work together with them and their industry is full of knowledge and technology they share with us.