What do fungus gnats, drain flies, Boxelder bugs and stinkbugs have in common this time of year? The common thread is they are all nuisance household insects that can be found in any home during winter.
Fungus gnats and drain flies can be lumped together based on their favored conditions, cool temperatures and humidity. Fungus gnats often come in with our houseplants for the winter, as they are stowing away in the pots. Drain flies find their way inside at some point before cold weather shows up and need "open water" to breed.