Without the cumbersome duct work, this system is easy to install and requires almost no maintenance. It is the optimal solution for cooling/heating your home or small business. Aside from it's outstanding SEER and HSPF factors, these air conditioners are equiped with the Inverter technology, which makes it work so quietly it's almost unnoticeable to the ear. This feature also makes it more reliable and a better long time investment. This mini split system also uses the new R-410A ecological refrigerant which makes it far more ecological than it's predecessors. The combination of the Inverter technology and the new R-410 refrigerant has a bonus advantage of it's own, since it increases the overall efficiency of the system by 15%.