Normally, when you purchase an air conditioner, the tonnage of the model is dependent on the size of the cooling area. Hence, if you need the AC to cool a small room, you need to select the model with the appropriate tonnage of AC. Customers mainly prefer portable ACs for small rooms. These models are designed for lesser cooling space, and portability makes it ideal for the purpose. You can easily position the AC at your convenience and enjoy effective cooling. Depending on the room size, a 1 to 1.5-ton portable AC is ideal for a small room.