First find out their point of entry and seal it off. Keep a tidy yard with no standing water. Clean up pet waste daily. Here are a couple links with more methods.
I have a few houseplants on my kitchen window sill, and they seem to be causing a fly problem (argh). Any advice on how to get rid of them? Any ideas would be helpful
House has a new roof. wrap underneath new vinyl siding, new windows and doors. Flies invade by the thousands in the fall and spring. Property is in northern MN.
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First find out their point of entry and seal it off. Keep a tidy yard with no standing water. Clean up pet waste daily. Here are a couple links with more methods.
http://www.rapidhomeremedies.com/get-rid-of-flies.html
http://m.wikihow.com/Get-Rid-of-Flies-in-the-House
We keep a fly shatter by the door.
if you have a lot, use one of those hanging fly strips, they do work real well even for gnats.
http://www.jcehrlich.com/flies/how-to-get-rid-of-flies/