Is your house too hot? Maybe you need to improve your timing. Adjust the hours you spend in certain rooms according to how much sunlight is streaming through the windows. At our house, it's sometimes unbearably hot in the afternoon and early evening in our living room, so instead of fighting it, we migrate to the office, bedroom, or backyard. By avoiding the worst hours in your hottest rooms, you can keep cool without spending a penny. That's a win-win, don't you think? Source