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In article ,
says...
Besides being 'purdy' (assuming I understand this to mean 'pretty'), new

Yes. They're designed for a more "modern" look. ;-)

casement windows are generally slightly more energy efficient than other
styles of windows such as double-hung. I assume this is since the locking
mechanism pulls the window closed tighter and since there isn't the wear of
the sliding parts they seal tighter over the long run.

They may seal a bit tighter, but half the cranks are stripped on
mine (another one went today). They stick out in the rain when
opened (have to run the AC whenever it rains in the summer). Can't
put an AC in them (easily). I'd *never* have them again. Gack!

That said, they aren't easy to use with even the standard casement A/C unit.
I had to pull out the entire crank and lock mechanism and drill two small
holes to fasten the mounting hardware for the older style windows I use to
have. Installing a thru-the-wall unit would still be more work, but it
still wasn't as simple as the A/C units for double-hung.

Through wall isn't easy, but putting it under the window simplified
things quite a bit (other than the wiring going through there.

--
Keith