Girl: I cannot believe the school is going to set the temperature in the library 5 degrees lower after 2pm.
Boy: Really? Why?
Girl: I am always studying there after 2pm and I get cold easily, so I will need to bring warmer clothing, which is going to be an inconvenience to me.
Boy: That is unfortunate, but the school needs to reduce the heating costs, so what would you have them do instead?
Girl: Well, I found out that there are certain windows that hold in heat, so if the school replaced all the old windows in the library with these windows, then they could reduce the heat and keep the library warm enough, so they wouldn't need to decrease the temperature and they can save energy.