The pups were complaining as this room got into the high 80s as I couldn't open the window due to the younger set. When the younger set reaches 3 weeks their bodies regulate. These guys already reached that milestone.
I have a plan on Wednesday or Thursday depending on my energy level after the last of the pups depart. We will be dividing the xpen that the older set is in now so both sets of pups can stare at each other and get used to each other. I will gain more room in here and we set them on a path of getting familiar with each other. We shall see how that goes.