Flies in the house

[North]

Hi! We built a new house two years ago. We enjoy it a lot, except for a major problem. We have flies during the warm season. Lots of flies. They are all over the exterior of the house. We even have some entering the house eventhough the windows and doors are closed. The real problem is that we have a built-in screen house adjoining our kitchen. Flies gather in the screen-house from the ceiling. How can I get rid of this mess.............Thank you very kindly for your help.

[AllanJ]

Can you find a place where the files are breeding or a place where there is a bad odor, for example of sewage or rotting foodstuff? A place on the ground that seems wet all the time can be suspicious, maybe there is a broken drain pipe or a septic system is failing resulting in sewage overflowing froma septic tank and saturating the ground.

I would go with good old fashioned flypaper. A long square cross section cardboard box such as one in which paper cups are sometimes packed can have openings cut in it and be used to hide the flypaper.