AC is running, but it is not cooling properly. What are the reasons?

The reasons are,
            1)Air filter gets blocked if the indoor air filter is dirty and there is no space for air passage. Thus clean the air filter.
            2)If Outdoor coil and indoor coil accommodated with dust particles then need to clean. 
            3)Check the air-conditioned room is properly closed or not. If not then close it properly.
            4)Check thermostat setting, sometimes heat mode is on so need to check thermostat setting also.
            5) There is a chance also compressor fault so need to check it also.
            6) At last, need to check the gas quantity.

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