Abstract: An air conditioning extender system including a flexible, air-impermeable tube fabricated of plastic. The tube has an input end and an output end and a circumference essentially equal to the circumference of the air conditioner output duct. The tube has a length at least several times greater than that of the circumference of the output duct and tube. A plurality of axial slits extend from the input end of the tube with a plurality of lengths of a first pile-type fastener secured thereto between the slits. The slits are adapted to releasably couple to a plurality of lengths of a second pile-type fastener secured to the circumference of the output duct.