If the factory-provided accordion panels must be used on the sides of the unit, they require careful attention to detail. These side panels are notorious for warping and cracking over time. To seal them effectively, one should extend them fully and apply a bead of caulk where the panels meet the window frame and the air conditioner cabinet. For homeowners seeking a higher level of insulation, replacing these accordion panels with custom-cut sheets of plexiglass or rigid foam is a superior alternative. This custom approach minimizes heat transfer, ensuring that the sun beating down on the side of the house does not radiate directly into the room.
By following these steps and tips, you'll be able to effectively seal your window air conditioner, reducing energy consumption and ensuring a more efficient cooling experience. how to seal a window air conditioner