Fix any holes in your screens and make sure they are tightly attached to the doors and windows. Mosquitos need water to reproduce. They can breed in any puddle or standing water that lasts more than four days. By removing areas of standing water around your house, you will eliminate their breeding grounds and reduce the number of mosquitos. Pay special attention to discarded tires.
Tires are a common place for mosquitos to breed.
Drill holes in the bottom of recycling containers that are left outdoors, so water can drain out. Clean clogged roof gutters of leaves and debris that prevent drainage of rainwater. Turn over plastic wading pools and wheelbarrows when not in use. Do not allow water to stagnate in birdbaths. Change it every three or four days.