Summarize the following:
A small 1 to 1.5 inches (2.5 to 3.8cm) home in your door can create airflow and cool down the room. You can leave the door as-is or insert a transfer grill to make the cut less obvious. Return ducts push air back to the air conditioner, allowing it be used again. That helps increase airflow because the cool air coming into the room has somewhere to go. If you don't already have these in your home, they can be expensive to install. One basic way to create return air ducts is to cut a hole in the floor in the wall cavity. Connect it to the room and the return air with metal sheeting. Jump ducts are u-shaped tunnels that create the same effect as leaving the door open, as they allow air to flow back out of the room when it comes in through the AC vent. For best results, install jump ducts in the attic. To install: Cut holes in the ceiling drywall. Place the jump duct above the rooms, and connect the registers on the duct to the beams. Seal the registers to the drywall using caulk. Then seal the registers to the duct using the approved ties and metal tape. In the rooms, place a ceiling grill under the duct.
Cut a 1 to 1.5 inches (2.5 to 3.8cm) opening in the door. Install a return duct. Use jump ducts to allow air flow in and out of the room.