Abstract: An assembly for covering a grill of an air conditioning unit that fits through a wall comprises a rigid or semi-rigid cover having a top, a perimeter flange to which a flexible sealing material is affixed, and having sides, the top having four corner apertures for insertion of the cords. Four elastic cords have a hook at one end and having a barrel lock slideably engaged to a second end. The barrel locks of the elastic cords collectively urge the cover against the wall so as to create an air-tight seal between the cover and the wall. The cover is urged against the wall and prevents unwanted upward hot air flow and downward cold air flow in the winter when the air conditioning system is not in use.

Abstract: An assembly for covering a grill of an air conditioning vent in the winter comprises a cover having a frame that may have a hole on a top surface and sides including a compressible material along its perimeter for sealing a vent area. In one preferred embodiment, the assembly includes an elastic cord having a looped end and a free end, the looped end being of adjustable size and having two hooks slidably connected to the cord. The hooks are configured to attach to the grill and pulling the free end of the cord tightens the looped end and the hooks. The free end may be attached to the cover so that sliding a barrel lock up the cord urges the cover against the vent area and prevents unwanted upward hot air flow and downward cold air flow in the winter when the air conditioning system is not in use.

Abstract: An assembly for covering a grill of an air conditioning vent in the winter comprises a cover having a frame that may have a hole on a top surface and sides including a compressible material along its perimeter for sealing a vent area. In one preferred embodiment, the assembly includes an elastic cord having a looped end and a free end, the looped end being of adjustable size and having two hooks slidably connected to the cord. The hooks are configured to attach to the grill and pulling the free end of the cord tightens the looped end and the hooks. The free end may be attached to the cover so that sliding a barrel lock up the cord urges the cover against the vent area and prevents unwanted upward hot air flow and downward cold air flow in the winter when the air conditioning system is not in use.

Abstract: An assembly for covering a grill of an air conditioning unit that fits through a wall comprises a rigid or semi-rigid cover having a top, a perimeter flange to which a flexible sealing material is affixed, and having sides, the top having four corner apertures for insertion of the cords. Four elastic cords have a hook at one end and having a barrel lock slideably engaged to a second end. The barrel locks of the elastic cords collectively urge the cover against the wall so as to create an air-tight seal between the cover and the wall. The cover is urged against the wall and prevents unwanted upward hot air flow and downward cold air flow in the winter when the air conditioning system is not in use.