Ya, I probably overemphasized that part because it's what I expect other people not to have thought of (and there's also a bit of a sense of a feature just going to waste if it's always enclosed so it can't be used, along with the rear window's defroster), but there's another reason to want the windows to be as big & open as possible, even if my truck's rear window weren't openable. In summer, it's easy to have too much insulation so it gets too hot even for sleeping, regardless of what the drive is like.
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I also recently finished another project with my apartment, unrelated to the adventure with the sockets & lights, with a funny outcome. My apartment and the one above both open to an indoor stairwell, which has a front door to the outside, on which the doorknob was a problem. It kept coming loose in a way that made it possible for one of us to get "locked" out without locking anything. It could be tightened but would loosen again. I told the landlord it needed to be replaced and I could do it myself but just needed permission. He not only agreed but also offered to pay me if I sent him the receipt for the new knob and told him how long the work took. Then actually doing it turned out to be a more complicated issue. The old combo of doorknob & deadbolt all in one, which itself seems to have been a replacement, didn't fit the standard format that such things seem to all come in now. Once the knob was out and the cover panels were off, it turned out that the holes in the wood weren't the size, shape, & placement that modern knobs & locks presume you'll have. And there wasn't even a way to extract all of it without breaking the wood because it's thicker than the hole it would need to come out through. There were a couple of small holes through the wood on the inside where it looks like screws could have been broken off, so I presume those screws that I infer were once there would have been the starting point for taking it apart another step or two so it could come out. But there was also a separate second deadbolt above, in a hole that does conform to modern standards, so I put the new knob in that spot and disabled what was left of the old one that I couldn't extract, but displacing it deep enough into its strange cavity that it can't ever come out of. The two deadbolts that it the door had before (one built in with the knob and one separate above that) had not been used by us anyway, and I didn't even have keys or think the other guy upstairs did either. The new knob has no lock so there's no key for us to not have. If the landlord wants a keyed system, he can have it installed himself, and give us the keys this time. At least now, with our keyless doorknob in a strangely high position where only deadbolts would normally go and the strange partial corpse of the previous one still hanging loose inside the door, we can close it, keep the weather out of our stairwell, and not be at any risk of the door being stuck closed when we need to get in. And I got $40 for putting that new knob in its wrong-looking strangely high position which I believe the landlord doesn't care about at all. The knob was a $12 and it took 40 minutes to deal with the old parts and put in the new one, so apparently I was working for $42 per hour.