no-see-ums can pass through normal screens. Step 1 is to stop leaving your doors and windows open. Step 2 is lower you AC temperature. No-see-ums will land on any vertical surface when the temperature is lowered sufficiently. At that point, you can use a hand held vacuum to take them off the walls. Sprays or chemicals have little effect. No-see-ums track humans and animals by CO2 emissions so bug zappers are not the best option. When we lived in the Florida Keys, we used a mosquito magnet which was very effective but that is not for indoor use.
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