The LSN307HV3 is a singlezone air handler and requires the LG LSU307HV3 condenser to operate. The LSN307HV3 is the indoor unit only, outdoor units are sold separately and are required to run this model. The LG LSN307HV3 is an air handler unit for a ductless split system air conditioning system. It features 30,000 BTU cooling and 32,000 BTU heating capacity and connects to the outdoor condenser through tiny, easy to install refrigerant lines and tubes. LG's ductless systems function much like a central air system, but without the hassle and unattractiveness of invasive ductwork. In fact, this system only requires a 3" opening in the wall or ceiling to get started. This LG air conditioning system This LG air conditioning system uses electricity to transfer heat between the indoors and outdoors. Using a two way refrigerant vapor compression system, it takes heat from the outside and delivers it inside on a heating cycle and reverses it on the cooling. This model has an EER rating of 10 and a SEER rating of 18, making it a truly energy efficient option.