I have flies in all the front windows of the house. I can't identify where they are coming from. I have sprayed bug spray, which kills them but when I go back to check a little bit later I have more flies. My house is very clean. I have checked the trash. I don't know where they are coming from. I have my central air on so no windows have been open for some time. Please help. I have been racking my brains trying to figure out where they are coming from and how to get rid of them. I live in Philadelphia. I had this same problem 2 years ago in the beginning of May. It lasted for a few days and they dissappeared.

Hello Alavan

maybe this explains : LINK : See wildandblue's reply !!! (https://www.askmehelpdesk.com/pest-control/flies-house-233089.html)

Hope this helps !

:>)

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I had this problem with small flies. They were laying eggs, larvae found in the window trim. I took the hose and flooded the sills of window and out the small drain holes of the windw sills came out tons of larvae. Then I put pesticide in the little drain holes. Buy the pesticide spray cans from exterminators it has an extension tube to go in cracks.