 Even if you've got the best of windows, low e-glass and all that stuff, and, you know, diminishes solar heat gain, you know, great numbers, pulling the shades down just helps a little bit more. Also, deflectors, you know, where you're actually deflecting the cooled air out of the register. Now, if you've got a register and it's just shooting right up into the room, who cares, right? It's fine.