I doubt it will be immediate relief, but I use fly predators here. Usually in the warm months, but I have found a few mosquitoes in the house already, so I will start soon with the predators. Surprisingly, water is even more important than the food source. Especially outdoors, any marshy or wet area will draw new flies, if there's a food source they will stay to lay eggs.
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These help a lot. Bottles and biting flies are what we battle here most.