Mini-Split, also known as ductless, or wall mounted air conditioners are becoming increasingly popular. Similar to central air conditioning units, mini split air conditioners have two main components: an outdoor compressor/condenser, and an indoor blower, or air-handling unit. A small hole ( approximately 3 inches in diameter) to connect the refrigerant lines between the outdoor and indoor units. The main advantages of split air conditioners are their small size and flexibility for zoning, heating, or cooling individual rooms. Each room, or zone has an independent thermostat so only that area where someone is present needs to be conditioned, saving energy and money. Since the compressor is located outside the house, the split air conditioner is very quiet and efficient. While it is more expensive than a window air conditioning unit, it does not need to be removed, stored, and reinstalled every year. In fact most of the mini-split units on the market today offer the capability of both heating and cooling while consuming considerably less electricity than standard systems.