How do you make or buy a heat deflector for window ac unit?

To make a heat deflector for a window AC unit, you can use materials like reflective foam board or cardboard covered with aluminum foil to direct hot air away from the unit. Cut the material to fit around the top and sides of the AC unit, ensuring it extends outward to effectively deflect heat. Alternatively, you can buy a pre-made heat deflector designed for window AC units online or at home improvement stores, which typically come with installation instructions for easy setup.