Install a Ceiling Fan
Before you crank up the AC, have you tried turning on the fan? If you don’t have ceiling fans, consider installing one. Ceiling fans are a much cheaper alternative than fussing with AC. They keep rooms surprisingly cool. If you have a fire going on in the winter, turning on a ceiling fan keeps the heat from rising, which in turn makes you much warmer. Furthermore, if you get a fan that runs clockwise, it can go even further in keeping the house warm.