Dehumidifiers work by removing excess moisture from the air, which can lead to a perceived cooling effect. As the air is dried, the heat energy is transferred from the air to the dehumidifier, resulting in a cooler air stream. This process is particularly effective in humid environments, such as basements, where the air is already cooler. By removing the excess moisture, dehumidifiers can make the air feel cooler than it actually is, providing a cooling effect without actually lowering the temperature.