OK, I'll admit, this seems like a really dumb question to me, but I'll explain why I need to ask.
We just built a new house and I found the HVAC contractor to be very good throughout the job. We have a multi-zone Carrier Infinity gas heat and air conditioning system for the basement and main floor, and a heat pump in the attic for the upper floor.
I noticed they were installing all of the ceiling registers so that the inside louvers (the things you pivot to open and close the register) would direct air toward the outside of the room, usually toward a window, but even in a large walk-in closet with no windows they pointed them to the outer wall. This means that if you open the louvers completely, the air goes straight down, but anything shy of completely opening them and it's pointing out of the room. You can't direct air toward the center of the room.
I asked the contractor about this because it seemed illogical to me and he said that's how they are supposed to go in, that they position registers above windows as windows are cold spots in the room, and the registers will keep those spots warm.
If I'd not found them to be very skilled and honest in their work up to that point, I'd have never believed this answer, but I reluctantly gave them the benefit of the doubt. I did have them reverse the one in the master closet which was pointing toward the wall, since there was no window to "keep warm".
The windows are all brand new, Low-E, double-pane Andersen windows, and the insulation package on the house is very thorough (1" of comfort foam for the entire envelope and then spray-in cellulose). As a result, we use the HVAC system only when it gets very hot or very cold out, and we're now using the heating for the first time. As I walk around, it just seems that the walls are staying a lot warmer than the room, and I wanted to see if anyone shared my contractor's opinion that the registers should point to the outside of the room.