I have struggled for over 3 years with flies in my window frames. They were new wooden double glazed and the front windows were south facing and the design of the window frames allowed flies to hibernate as there was this gap, although air tight from the inside. On warm days from autumn to spring when the sun was beaming onto front of house, the windows and around the windows you could see these flies all come out from the windows. They made me feel the house was dirty. You couldn't open a window inside without them all coming in (and so many flies). It felt as if the house was dirty. After some research online (as no one I knew had the same problem) I found out they were cluster flies. So I located Formual C Cluster Fly Spray. Bought 2 bottles thinking as it was so bad I am going to have to do this every month or so just to keep on top of the problem. Well after one application on the windows just from the inside going around all the frames with the windows open the flies flew away or were killed. A few weeks later on the next cold sunny day I got ready to have another crack at it. No flies were in the frames. I sprayed the frames again to be on the safe side. This was back in late October and I am happy to say its February and no sign of any flies at all. So after one application the problem was solved.
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