Install smaller wall a/c in bigger wall opening?

Question

My older wall a/c is not functioning. Wall opening is 22" W X 14.5" but most of the a/c in market are normally smaller than the diemension of my opening.

How can I install a smaller unit in bigger opening? I can get one which is about 2inch smaller in width

Answer 1

Just fill it in with a piece of wood to make the opening fit your new unit.

Answer 2

Most units come with an accordion type plastic strip that expands to fill in the gaps of the window.  Anyway that's what I got when I purchased mine.  When you purchase your new one check to make sure this comes with it.  It should be standard issue.