Well I just found out the source to my problem today. My fucking friend only told me today that he saw a gang of those fruit flies coming out of one our hidden trash cans last week. It's one of those trash cans with a rotating lid. We didn't empty it for 8 months. All kinds of rotten food in there it stinks. I opened the lid and swarm of those flies came out. I was fucking scared like a bitch. We emptied that filthy trash can today. How did we forget to empty a trash can for 8 months? I don't know. There are still some left but at least we got the main source. I'm setting my a/c to 65 degrees while I sleep tonight because I think that is too cold for them to survive.