Press the Mode button and select Cool. Step 2. After selecting Cool mode, you can also select the desired function, temperature, and fan speed as well. To cool more quickly, select a lower temperature and a faster fan speed.

The required cooling capacity for a room air conditioner depends on the size of the room being cooled -- room air conditioners generally have cooling capacities that range from 5,500 Btu per hour to 14,000 Btu per hour. A common rating term for air conditioning size is the "ton," which is 12,000 Btu per hour.