Air conditioners use refrigeration to chill indoor air, taking advantage of a remarkable physical law: When a liquid converts to a gas (in a process called phase conversion), it absorbs heat. Air conditioners exploit this feature of phase conversion by forcing special chemical compounds to evaporate and condense over and over again in a closed system of coils. Summer heat can be fun with Koryo. The 2 way air flow direction ensures your room remains cool and you save yourself from the tremendous heat. The turbo function will be helpful to cool your room quickly and effectively by operating at the maximum fan speed. The AC comes with anti bacterial filter, On/Off Timer and Auto restart. The warranty shall be void by any act of attempted installation, servicing, alteration, or removal of parts by any third party not specifically authorized by Koryo.