Ductless air conditioning systems were first introduced to US market by Sanyo Corp. of N.A. and Mitsubishi Electric in 1985. Ductless air systems are used for heating or cooling of homes or offices. By using ductless cooling systems one can air condition even the areas of the rooms that are difficult to reach. These systems are very practical for offices, homes, hospitals, banks, hotels and even the schools.
Ductless systems don't use ductwork or ducted air distribution and therefore can't be installed at some places. Ductless air conditioners are also known as mini-split air conditioners since they work in similar fashion as the ducted central air conditioners do, but on smaller scale.
Ductless mini split air conditioning systems consist of two essential components: an indoor unit and an outdoor unit. An indoor unit contains an evaporator and a blower. An outdoor unit contains a condenser and a compressor.