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I was in the same boat as you in regards to not wanting to drill into any walls. I placed some "cut to size" packing foam block at the bottom of the window and closed it on top and wedged a piece of PVC above to maintain constant pressure from above. Drilled some under-sized holes and ran line through making sure to provide a tight seal.
The last picture shows it from the outside, and one can see what daily UV exposure has done to the foam block from the exterior. I plan on cutting a new piece soon to replace it.
Been happy with it, it was cheap, provides a good seal from weather, so far kept critters from intruding, and not at all hard. It's hokey, but worked. ;Wacky
Note: Now looking at it all, I'm thinking I should clean it up a bit and dress it all up to look more normal...oh well.
I like that idea! I would probably do the same as you except the wife would not be happy with that look
I don't think my wife had seen that part of the house, nor have I brought it up.