A few nice Window Unit images I found:

AC Window unit supported by Bible


Image by jasoneppink
This is attached to a church building. I’m pretty sure that’s a Bible supporting the window unit.

expandable AC window unit support


Image by jasoneppink
I’ve seen several of these devices used as supports, so my guess is that it is explicitly intended for supporting AC window units. They remind me of those expandable gates one erects in one’s house to contain a toddler to specific rooms.

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