Air pressure depends on the density of the air. Since warm air is less dense, it will rise and so cold air will sink. With Propel，the consumer can save electricity by making the AC in their room work less. It disrupts the setted cold air and pushes it up and outward allows the cold air to move into hot spaces and disperse. The settled cold air is inhaled from the botom grill and pushed upwards and making the room's air circulate. With air circulation，the room will be cool much faster with a low settings on AC rather than pushing your AC's setting to high which wastes a lot of energy and cost.