1) Check to see if the set temperature is appropriate. 2) Check the dust filter and clean it. 3) Observe if the air in-flow and out-flow are normal. 4) Check whether doors and windows are properly closed and if the sunlight is unusually strong. 5) If all checks and corrections are done, but the room is still not cool, a technician should be called for a thorough inspection.
A remote control for an air conditioner not working might result from the following cases: 1) It might run out of batteries. Try replacing the batteries. 2) The battery may not be positioned correctly i.e. switch the positive (+) and negative (-) terminals. 3) The remote control might be further than 8 meters away from the unit.
The air conditioner should be installed in an area that allows for an even air flow distribution. It should not be installed in a confined corner. The mount must be strong enough to bear weight and vibrations while working.