Our NYC apartment building has very deep exterior ledges, extending around a foot beyond the window, but 2-3" below the window frame, so a window AC can't rest flat on it. How do we appropriately brace/mount the AC? none of the standard mounting brackets will work, as they don't extend far enough out to reach over the ledge. We don't want to just prop it up on blocks, as everything I've read suggests this is illegal.
Any advice appreciated!
How to install an air conditioner in a window with a very deep exterior ledge
air-conditioningmounting
Related Solutions
Most window units are designed for double hung windows. If you want to place it in a casement window (or a sliding window) you really should use a unit designed specifically for that. Here's an example:
However, anything can be hacked. If you build a proper bracket/shelf, and then enclose the top part (plexiglass, for instance) you can probably use what you have (provided it fits, of course).
Since it sounds like it might be difficult for you to get to a lumberyard to build your own solution, you might be better off using a pre-made product. AC-Safe, makes Universal Air Conditioner Supports that might be useful in your situation.
The system requires you to screw the platform into the window sill (which may or may not be possible in your situation), then simply rests against the outside of the building to support the A\C unit.
I've also seen brackets that mount to the bottom of A\C unit itself, and offer support against the outside of the building (but I was unable to find an example online. I think Thermwell makes them).
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Best Answer
I strongly recommend asking your landlord. They will have dealt with this before, and will know what solutions will work -- and given the potential liability issues they may insist on doing the instillation.
(I have dismounted a NYC airconditioner, which had been installed with a moderately complex metal framework apparently designed to solve exactly the problem you are describing. I don't remember any details, though.)