Follow these specific steps to get rid of cluster flies.
Dust attic for flies.
Place protective screens in attic and chimney openings.
Seal up all cracks and crevice and any holes.
Attic flies which are also known as cluster flies are insects that often migrate into homes in the fall where they hibernate for the cooler fall and winter months one of the best tips for getting rid of attic flies is to keep them from entering the house in the first place as trying to eliminate them after they are in hibernation can be difficult.
Spray insecticide where cluster flies hibernating.
Then once the relentless heat zaps the pesticides strength life goes right back to normal for the pest no worse for the wear.
No fog dust or spray in the world will get to anything there.
Identify where they are.
Do not apply too much dust at once or the dust will not be effective as cluster flies will avoid piles of dust.
A diazinon spray or dust may also be used for longer residual action.
Say no to gaps.
Use a fly light.
These guys will be repelled by the chemicals and retreat from going in your attic.
Place dust in cracks and crevices.
Remember attic flies want to cluster indoors when it starts to get a lot cooler outdoors.
Fly lights plug into standard outlets and can be placed in attics basements and rooms that are not often used like guest bedrooms.
To kill the flies that buzz about rooms use a synergized pyrethrins spray or aerosol.
1 2 puffs at a time will be plenty.
Steps for cluster fly control.