I wanted to leave the screens on my coop windows to keep bugs out of the chicken house, but I also wanted to be able to access them easily to clean them when they got cruddy, so I didn't want to screw hardware cloth directly into the window trim. And I couldn't put the hardware cloth on the inside because I needed to be able to access the windows to open and close them. But I knew I wanted (and needed) hardware cloth to keep out predators.
Here's the solution we came up with. My husband built a frame that would fit over the bottom half of window, and we attached the hardware cloth to that frame. We then took the hardware cloth frame and attached it with hinges to the interior frame of the windows and put a latch the opposite side for secure closure. I probably haven't explained that very well, so I'm including a picture:
Screen when it is closed.
Screen when it is open.
After I took these pictures we screwed a small 1X2 into the window frame behind the top of the hardware cloth screen to prevent any critters that tear through the regular window screen from squeezing into the coop.
We had thought about attaching these screens to the exterior of the windows, but we were concerned about moisture trapped between the screen and the trim deteriorating the wood.
Rachel
PS When I say "we" did something it really means "he" did it.
I'm more of an "idea man".