Insect-proof your home. Are you checking your window or door screens if having holes or tears? Repair them that would let mosquitoes fly in. There's no sure way to prevent mosquitoes from coming in, but taking these measures can really help.
Dump or flush out any stagnant water sources in your yard. Are you having old tires, clogged gutters or empty flowerpots, and any item that can hold water for more than a few days at a time? Mosquitoes are often attracted to water, especially standing water. Should drained or disposed.