Is a ductless air conditioner more efficient then a central air conditioner?
In most cases, yes. The evaporator is placed close to the ceiling and since colder air is more dense then hot air, the cold air will naturally drop allowing the air conditioner to utilize its maximum cooling capacity. Unlike central air conditioning systems, the evaporator unit is placed in the basement above the furnace, which needs to push the cold dense air up to the second or third floor. In central systems most of the air will travel through the shortest runs creating a cold basement, a fairly cool 1st floor, usually unsatisfactory conditions on the 2nd and 3rd floors. One effective solution for this problem is to install butterfly valves in all the main ducts to control the airflow pattern.
