Abstract: A window defroster system is provided. The window defroster system disclosed comprises an operable communication with an HVAC or forced air system of a building in which the device is located. The system comprises a first duct in communication with an air supply from a furnace, and a boot in an operable communication with the first duct. A second duct is in operable communication with the boot for directing air toward a window. A window boot is in operable communication with the second duct for transmitting air onto a window. A window defroster system comprising a manifold device as well as window defroster systems for use in connection with a control, such as in connection with a bathroom vent, are also disclosed herein.