A drain line will be required for the indoor unit to transport condensation away from the unit. This condensate drain line is not included with this system, but can be purchased additionally as an accessory. You will need a drain line that is specifically designed for this purpose and unit. The condensate drain line is usually installed so that the equipment can be gravity drained right out of the back or the sides. However, if the condensate drain goes up against gravity a condensate pump is required to pump the condensation up and away until it reaches a drain or gravity takes over. Both the condensate drain line and the condensate pump can be found on the product page beside the product description. For further assistance, please give us a call.