Trying to give my father information

This is the first winter we have had chickens. And thanks to many of you, I have a lot of great information. My father is getting old, and set in his ways. He talks to a lot of famer folk around us for his ideas. I am trying to make him understand about a air vent or exhaust fan in the coop. I do not have the demenions, but its half my dads shop and half coop. I am trying to make him undrstaand that the Isa Browns will not freeze if they have a vent/exhaust fan. It gets too warm in their now being Novemeber, with the warm streak this week. And one day it really smelled strong. I don't know what to say to him. And the girls need a place to roost. He made a ladder up to the window. None of them have got on it cause they do not climb like we do. So they have no where to roost. And I would like to find a thermo cube and also know if Tractor Supply would carry a non lit warming bulb. We have the lit up heat lamp, and two light bulbs in there. I know it can get cold in northern Indiana, but I would really appreciate it if some could give me a gentle way to tell him what we need to do. Everyone keeps telling him (back in the ols days) We never did that with our chickens. Thank you!