(The hot air may be seeping into the room instead of escaping through the outside vent if there is an obstruction in the vent hose ... replaced with a rigid metal duct. If that’s not possible ...

Air Conditioners, Self-Contained, 5 - 15 Tons, Air Cooled Air Conditioners, Self-Contained, 5 - 15 Tons, Water Cooled Air Conditioners, Self-Contained, Over 15 Tons ...