A few days ago I noticed a few flies in my kitchen window, which is on the west side of our house. We killed those and went to bed. The next day we had approximately 10 flies in the same area, I noticed some would fly across to the opposite side of the house in the morning to the sun. I assumed to be by the heat. It's now been approximatly 5 days and the problem is consistently getting worse. House is clean, trash is taken out. We haven't smelled anything unusual or noticed any dead animals. Why are they coming in to my cool indoors when they want the warm/hot outdoors? What do I do to get rid of them?