Probably not. Male mosquitoes swarm during mating and some will rest on the side of a house together. Both male and female mosquitoes will seek shade during hot weather and, if a house offers a cool, shady resting spot, then mosquitoes may cling to the walls. However, usually large swarms of insects clinging to a house or side of buildings are non-biting midges. These look very much like mosquitoes, but do not bite. They are often called “blind” mosquitoes. If midges are clinging to your house it is a good idea to wash them down with a hose to prevent them from staining your wall.
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