Here is a little trick that I use to help keep the house cool. At night I open a few windows, not all of them, just a few on the north side of the house. I then place a window fan in a window on the south side of the house. This fan is blowing air out not in. By doing it this way you are pulling the cool air into the house from the other windows. The key to it working just right is, of course a rather cool night and closing all the windows the next morning thus keeping the cool air in. I close all blinds or curtains on the east and south side of the house to keep the sun from coming in and warming the warm too. This little trick helps keep the house pretty nice until late evening and I sometimes don't use any air condition until 5 or 6 o'clock. Keeps you cool and saves you a little money on your electric bill too. Hope this helps some of you.