That really depends on your air conditioner and how hot or humid your room is.If the outside temperature isn’t extreme, let’s say it’s around 26 degrees, but it feels very humid, running your unit on dry mode at around 23 or 24 degrees is the best way to go. However, if you’re the sort of person who wants the temperature to be 18 degrees or less all the time, running your unit on dry mode doesn’t offer any cost-saving benefits.