The United ARab Emirates (UAE) has one of the highest wet-bulb design temperatures in the world (87°F [30.56°C]), making it one of the most challenging places for controlling indoor relative humidity. Around 20% of the total building cooling load and annual energy consumption is used for the treatment of the fresh air supply needed for ventilation. For those reasons, we are always challenged to look for better and more efficient ways to treat the fresh air supply.