Air Conditioning Window Unit Light Duty Support Bracket - up to 80 Pounds

Likely not to fit your window
The nice thing about this bracket is you can install it from inside without getting on a ladder.
The bad thing: It probably won't fit on your window.

The design requires that you have a window sill (not all windows have one) which extends for a certain length - not too much or too little from your outside wall. It also requires that your window not extend to high above the sill (vinyl windows have a border which seems to be too high).
You will be able to install the bracket. The problem is, the hinged support underneath won't reach your outside wall. Or, if it does, the angle will be too shallow to provide adequate support. Or you may get lucky.
I bought two of these and it wouldn't fit properly on either apartment where I tried to install it. (the fit is hard to explain, which is probably why they didn't).
They tried to make it adjustable. There are plastic spacers and multiple screw holes. They just did a poor job.

Does your window have a sill?
Won't work with flush mounted windows unless you place a ledger outside and notch it to seat the cross piece. The design of this brace assumes the window has a sill. Once installed, it works but for windows without a sill be prepared with some tools, i.e., tape, power saw, and drill.

NYC requirement - installs a bit different that the instructions say
I purchased this after moving to NYC in what turned out to be a blazing hot summer. I had no previous knowledge of these devices, but not wanting to disregard local laws (and more importantly, get in trouble with our building super) I went ahead and ordered one to keep in full compliance.

My first, second, and third attempts to install this were a dud. Pre-war Manhattan apartments, as it turns out, have very thick walls and deep window sill preventing any sort of installation that looks like what is pictured in the instructions. My first two attempts left the unit leaning into our apartment which I knew would mean the condensation would be joining us inside as well. The third attempt achieved the right slope, but left the A/C unit about 1.5 inches above the lip of the window frame (and leaving me with a lot of left open space to block.

Finally, I called a local handy man, and he shifted it further down the sill, away from the lip of the window sill that the...

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