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Walk around the exterior of your home and look for places that might be inviting to a population of no see ums. This may include unused fountains, bird baths, stopped-up gutters, and groundwater. When you come across a potential hotspot, drain it or fill it in with high-drainage material like gravel or sand.  Don’t forget to peek inside any household items you find sitting out, such as buckets or wheelbarrows, to see if they contain stagnant water.  You may need to have larger bodies of water like ponds and gulches professionally irrigated in order to dry them out for good. Pick up a few rolls of tight-knit insect repelling mesh and put them in place over your home’s windows. As small as no see ums are, the grid-like weave of small insect repellent meshes are even smaller.  You can buy rolls of mesh screening at any hardware or home improvement store. They come in various sizes, from standard grade window screen all the way down to ultra-fine 20x20 “No See Um Mesh.”  Inspect your screens regularly to make sure they’re free of holes or tears, and replace damaged sections if necessary. Even the smallest opening may be big enough to admit a tiny no see um. Set your thermostat to around 65–70 °F (18–21 °C) or below and let it run in intervals throughout the day. No see ums are attracted to warmth and moisture, so the cooler you keep it in your home, the less likely they are to come around.  If blasting your air conditioner nonstop isn’t an option (say, if it’s winter), switch on a ceiling fan or portable box fan. This will at least keep cool air circulating throughout the room.  Consider investing in a dehumidifier if you live somewhere with above-average humidity levels. Get in the habit of switching off all of the lights outside your home shortly after dusk. Many types of insects, including no see ums, gravitate towards light sources. These essentially act like homing beacons, signalling for bugs to come closer. Not only will shutting your lights off make you less visible to no see ums, it will also save you money on your monthly utility bill! If you’re going to be outside someplace where no see ums tend to be a problem, be sure to pull on a pair of full-length pants and a long-sleeved shirt. It may also be a good idea to throw a hat on to minimize bites around your head and face if the no see ums are out in force. Always wear tall socks and closed-toed shoes anytime you’re walking near standing water in no see um-infested areas. One of the best strategies for dealing with pesky no see ums is to simply avoid them. Steer clear of locations like ponds and marshes, as well as any place where water has collected and grown stagnate. Chances are good that there’s a cloud of no see ums not far away. If you do find yourself in one of these areas, try not to hang around too long, or your risk of being bitten will increase.

Summary:
Clear up any standing water you find on your property. Install mesh window screens small enough to keep no see ums out. Leave your air conditioner on to lower the temperature and humidity. Turn off your porch lights at night to avoid attracting pests. Wear long-sleeved clothing to keep yourself protected from bites. Stay away from wet, boggy areas where no see ums tend to swarm.