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Without the Model Number, it's hard to know what knob fits your model. However, the link below, may provide some help. But, having the Model Number would be a bulls eye. Remove the front of the AC unit. There may be a manufacturer's data plate inside, which would provide the model number.
Hello, first the filter anf if it is dirty clean, check the evaporator coil and spray it with coil cleaner if it appears dirty, you can purchase coil cleaner at any heating and cooling store. If that does not help most likely you have a leak in the system and must be recharged with refrigerant.