How do I correctly measure my window for an air conditioner?

Question:My window is 20x20 and the air conditioner i'm interested in is 12x17.28x11.15. Is this going to fit? How do I know? I have never bought a window air conditioner before and I feel overwhelmed and confused.

Answers:
Measure the opening of the window. If the dimensions you gave are correct, it will fit. They have 'filler' panels to block out the openings. It really is that easy.

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It will fit. You might need a board to place it on if it is an aluminum frame window.

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