I have a window that is bigger than the largest piece of plastic i have, is there a way to use 2 pieces like tape them together or something?
Have you looked in home improvement stores for big, wide, heavy duty (thick) pieces of plastic? {usually comes off of a roll) It may be big enough, and being heavier, it will do a better job of preventing heat loss.
Use clear tape to attach them together The wider the better. Lay the plastic on a flat surface, a table if it is big enough or you can use your kitchen or living room floor. Place the 2 pieces side by side (edge to edge). Cut 2 very small pieces of tape and attach them, one at the bottom and one at the top, to secure the plastic and keep it from sliding around while you tape the entire thing together.
