I guess they are in there cuz it is pretty dark.. but they also don’t leave from there at dusk. It is not damp at all.. they hide in the pine shavings and hay...Why are the mosquitos hanging out in there do you think? Is it damp anywhere? Could they have bred there? Another thought is that mosquitos do not like light areas, they prefer dark places, that's why in the tropics the walls are often painted white. Perhaps during the day (when not roosting) a bright light might discourage congregations of mosquitos in there.
