When the weather is a little hotter, there is a kind of flying insect in the room. Under what circumstances will such a bug occur? What kind of insect is this?

Hello, this may be a mosquito, but it won't stick to the wall. But as long as the room is ventilated and dry, the small flying insects will disappear. And according to your situation, it is likely to be aphids, but if you do it, it is also a good choice to smoke with mosquito-repellent incense!