How do i make my room air conditioner colder?

Open the fron grate and if there is another filter pull it off. There will be lots of fins like on the back and they may be cloged up. use an old toothbrush to clean it. These fins are what the air passes through and the air is cooled by the cold gasses in the tubes so if it is cloged it wont work properly. If this dosent help its likely its the freon gass in the lines.