I originally measured out my windows and sent in my order. A few hours later, I was contacted by the company to confirm my choice as they recommended a different configuration. Due to the size of the window, it was recommended for me to use a up-down configuration over a left-right configuration as it is a sturdier fit for a long window. Went with their recommendation and have absolutely no regrets!!! Great product overall! Blocks out light, heat and surprisingly even noise.