just leave the tubing in the room.... there is no reason to hang it out the window, if there is already the carbon scrubber on there...
just let all the air fall back into your house, it wont stink b/c it's already been filtered..
and that way your just 10000% sure that no one can see your grow...
i would say only exhaust out your house if that is where you want to send all the foul odors too, but your just sending out clean air....
just and idea...