1. Ensure all windows and doors are closed, except the window which the exhaust hose is fed through.
2. Switch off or move any heat sources that are in the room.
3. The temperature is set too high on the unit.
For more information, see the Adjusting the temperature setting topic.
For more information, see the Cleaning the air filter topic.
5. Ensure the size of the room does not exceed the room size the unit can cool.
For more information, see the Calculating the size of your room and Calculating the British Thermal Units (BTU) topics.