Practical Mosquito Killer

Yesterday, after cleaning my room, I found out that there are so many mosquitoes flying around after all that thorough cleaning. My room has an air-conditioning unit and using a mosquito killer coil is not a good idea. My friend told me to use a plastic plate, put some oil on it and sway it all over the place where the mosquitoes could be found. I used a plastic cover instead and about 90% of the mosquitoes were caught alive in the oiled-plastic cover. I guess it is an efficient way to kill mosquitoes in a 5x5 meter squared room. But in a larger room of course, fumigation is much better.