This is the same family to which bottle or blow flies belong.
Flies all over house siding.
Have seen this at work on cooler days.
Cluster flies come from the calliphoridae family.
Those large flies in your home in winter are probably cluster flies which overwinter in the protected areas between the inside and outside walls of your home or in the attic or basement.
They lay their eggs on animal feces garbage and in rotting organic material.
If you re suffering a large swarm of flies in the house save yourself the cardio of whipping your flyswatter about and first see if you can get the majority of them to leave willingly.
I think a few even bit me it feels like.
In the past week i ve noticed thousands of flies randomly all over the side of my house all 4 sides actually.
By james clark insects such as flies are naturally drawn to vinyl siding because vinyl siding attracts build up of airborne sugar particles from nearby trees plants and brush.
If you suddenly see a swarm of flies that means dozens of eggs have already hatched and developed into flies.
Overwintering insects generally stay in secluded areas until the warming and lengthening days of spring pull them from hiding.
I have flies all over the outside of my house.
Houseflies are found almost everywhere people live.
Seal cracks around windows and doors where flies may enter.
Use well fitted small mesh well maintained screens on all doors and windows.
Cluster flies are large black coloured flies with the scientific name pollenia rudis they show up in homes from late fall through early spring.
Therefore barriers preventing access to the building are the first line of defense.
If i go outside they are clinging to the siding vinyl and buzzing around hitting me in the face.
If it is cool or cold out the flies will land on the siding to get warm if the sun is shining on it.
House flies are about inch long and gray.
Flies found inside the home have entered from the outside in almost all cases.
Unlike brick or wood homes the sugar particles which may not be detectable to the human eye stick to the vinyl siding causing flies to gather.
The source is likely inside your house garage attic or garden.