demolitionframewindowswood
This is a frame inset into this old leaded-glass window I'm going to restore. It is nailed into the original frame, and I can't get to any of the nail heads to get started. It's important that I don't damage the original wood, but the inset frame is junk.
Strategies?
You'll want to use glazing compound, which comes in both oil-based, and latex, and can be found in both cans or tubes.
Once you have the glass removed, and the frame cleaned up.
Install the interior trim, and wait for the glazing compound to cure.
Once the compound has cured enough (24-72 hours), using a utility knife carefully trim off any compound that has oozed out.
If you are not using interior trim, you will want to apply a bead of glazing compound to the interior side of the frame, and use a putty knife to smooth it to a nice finish.
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).
Best Answer
You could use a reciprocating saw down the side of the frame an cut the nails.
You could also cut the inside frame in sections, without hitting the original frame. Then just break it apart with a hammer an chisel
Or if you can find where the nail heads are just chisel around them (without hitting nails) an enough room to grab the heads with a pair of pinches.