These solid, simple frames require no exterior brace. This is perfect for apartment dwellers and those who only need an air conditioner a few months of the year. It takes about an hour and some basic lumber and tools to construct these frames. Once built, your air conditioner can be installed and uninstalled in minutes. (Please note that window air conditioning units aren't intended to be permanently installed. These frames also make it simpler to remove them at the end of the warm season.)
The units pictured include unfinished plywood. However, this can be finished, painted or replaced with plexiglass or other materials, as the sheet lumber simply covers an opening and is not structural.
2X4s *(2 or less but the amount varies)
12 deck screws (or other long wood screws)
- These window sills in the picture are fairly deep, allowing for the use of 2X4s. You may be able to substitute other lumber for shallower sills.
Step 1: Take Measurements
Measure the height of your air conditioner. This height should be the box height and not include the lips on the bottom or the top.
Measure the height of the window opening. Take this measurement right up against the window because it will give the shortest height of this opening. (Again, mistakes reminded me that sills can angle away from the window, giving a height that is too long.)