This is not limited to Asian, single units are also common in European, and Central American cities; (likely buildings that existed prior to air conditioning ub

This is not limited to Asian, single units are also common in European, and Central American cities; (likely buildings that existed prior to air conditioning ubiquity -- which also related to sealing of the home); Much of this is related to air conditioning attitudes as well; Do you need to have comfortable temperatures in the entire house or just a living room with comfort when working, watching tv, eating dinner. tldr; air conditiong views vary from necessary to an accessory; where they're an accessory, one of units are most common