Install screens on your doors and windows. If you have screens, make sure they are in good condition and that there are no holes or tears. If you don't have screens, you can install them yourself.
Use fly traps. Fly traps can be used to catch flies that have already gotten into your home. Place fly traps in areas where flies are a problem, such as near the kitchen or garbage can.
Clean up food and garbage. Flies are attracted to food and garbage, so it's important to clean up these areas thoroughly. Make sure to wipe up any food spills, and take out the garbage regularly.
Use natural repellents. There are a number of natural repellents that can be used to keep flies away. Some common repellents include peppermint oil, lemongrass oil, and basil. You can place these oils in a diffuser or spray them around your home.
Keep your home dry. Flies are also attracted to moisture, so it's important to keep your home dry. Make sure to fix any leaky faucets, and dry up any wet areas.