A popular misconception about air conditioners is that turning the temperature down quite low—say, around 55°F—will help the house to cool down faster. However, if your ideal temperature is around 77°F and the house is 80° right now, this simply isn’t the case. It will only waste energy and cool you more than you need, since most air conditioners move at only one speed: 100%.
However, we’re huge fans of the dual-speed air conditioners that are manufactured today. This does not mean you should turn the temperature down further to cool the house down faster. Rather, a dual-speed air conditioner helps you achieve your chosen temperature with greater accuracy.