I have a window that has a metal frame with two raised lips. All the diagrams in the installation manual show only one raised lip. The problem is that the bottom frame of the window unit that is supposed to rest against the lip is thicker than the gap between the two lips.

How can/should I go about installing this window unit.

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    A picture would help. – iLikeDirt Oct 14 '15 at 18:30
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    Picture of the window and the supporting rail of the A/C if possible. – JPhi1618 Oct 14 '15 at 18:33

My solution has been to build up the inner windowsill by temporarily affixing a 2x4 on top of it, and use that raised surface to mount the AC. Depending on the window hardware, you may be able to align this so the window can be closed normally when the AC isn't present, avoiding the need to dismount and remount the adaptation.

This could be made more attractive, of course. But an AC in the window usually means aesthetics aren't a primary concern.

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