We're currently building our coop, (if the weather ever cooperates!) and we're planning to build our own windows, screened with hardware cloth, covered with plexiglass and hinged so they can be opened during the 3 days of summer we get here in the Northwest. Would any of you be willing to explain how yours are built, how are they held open during hot days, and possibly even show me photos so that I can show DH and his buddy? Much appreciated! Edited to add: These windows will be installed in a 4X8 raised coop with an attached run. We will also be providing extra ventilation.