You can use air conditioners with a cooling capacity up to 12,000 BTU in a small room of up to 34m2. These portable air conditioners have the lowest cooling capacity, so they're suitable for spaces like an office or bedroom. An air conditioner doesn't cool as well when there are many electric product in a room, such as a TV, fridge, or console. Does your room have many electric product in it? Choose an air conditioner with a higher cooling capacity.