[Porsche virgin]

Quick question from the non-mechanically inclined to the mechanically inclined:

I'm thinking about buying a slide-out chassis A/C for my upstairs bedroom. I believe I would have to screw the chassis into my window frame. I'd also have to screw window stops or some such thing into the sash. I'm reluctant to put holes in my windows that are barely five years old. Also, I would want to remove the frame for the winter. It that a big deal?

Thanks in advance.

PV