All the modes in the air conditioner have their pros and cons. Most air conditioners come with four modes - Auto, cool, fan, and dry. Auto mode is the best-preferred mode among all as it allows the machine to operate on its own and change according to the ambient temperature. The Cool mode is suitable for all those who want extra-cool surroundings in their room. Dry mode is a must-have if you live in an area prone to excessive humidity, and Fan mode focuses more on air-circulation.