The Sky Air A-Series is a reflection of the connection between the outdoor unit and the customer. The Active Series activates the relationship. The outdoor unit is rapidly effective and efficient offering excellent value for money. (Price) The Advance Series helps meet a set of broader application needs by offering more features and benefits. (Performance) The Alpha Series is for those taking the lead and wanting to take full advantage of all the technical benefits in order to meet all application requirements. (Efficiency)