hey, john, that's what we have done so far and it works great - except we now bring our cat along, and she would go through those tucked in screens like nothing. It's probably possible to work out a secure screen arrangement, but the mechanics of it are that you need to move the screen to open the window, run around outside, stick in a stick to hold it open, run back in, stick the screen down, you get the picture. One bad storm in the middle of the night and all of a sudden that's less of a good idea too.
I'm going to be real happy with the Pen's, and the cost already doesn't hurt, I've forgotten already...

Brian