In winter in the north, there is no heating in my room, but there are still many mosquitoes, and you can't kill them all. Is this a matter of feng shui?

It's not that there's something wrong with feng shui. First of all, you should consider whether there are many places with water sources in your family environment. Mosquitoes are easy to breed in places with plenty of water. If there is, remove the water source from the corner of the house, clean up the dust in the corner, and don't store the leftover food outside. Cover it with something, so that the environment is good and there will be fewer mosquitoes.