Yup, it was still 46 until the plenum fell off the fan from me fiddling around with the duct. (As you can see in the video, it blocks my keyboard, so I was gonna try and see if I could wrap it around my monitor and have it still be close enough to the window to suck in cold air)
Now back up to 53. I'm gonna wait and move the computer on to the floor next to the desk before I try to put the plenum back on it. That way I can put the duct (the non-broken part) all the way outside.
Then I have to figure out how to keep my cat from trying to go outside or into the computer, and insulate the rest of the window so that the cold air only goes into the computer and not onto me. That, and find a way to lock it so that nobody can open it up and come in and steal my piffy plenum.
Well, I suppose there's also the thing about putting a grill over the end of the duct so nothing gets in it.