The most powerful portable air conditioners in our assortment have a cooling capacity between 16,000 and 18,000 BTU. With these, you can cool down a large room of up to 51m2. How well the portable air conditioner cools depends on the heat load. Does the room often have sun shining in through the windows or are the TV, console, and oven on often? The portable air conditioner won't cool as well. Portable air conditioners for large rooms are easy to control with a remote. Choose a portable air conditioner with an app if you want to turn on the air conditioner before you get home.