system
Given the following post, respond as if you're commenting on Reddit:
human
On a standard double-glazed window, which part of the glazing radiates out the most heat from indoors? The higher or lower end?

It's a bit of a silly question, but I can't get it off my mind.

I'm putting up some Static cling window films for winter because it reduces heat loss through the glass. The dimensions are roughly about 50x38 inches.

Since I'm not covering the entire window I started wondering which part of it would be where the largest portion of the heat escapes through the window's surface. My intuition tells me it is the upper half, but I'm also not sure if there would be any appreciable difference at that scale. The way modern double-glazed windows are structured to help prevent heat loss also makes me more uncertain if it would work quite that way.
gpt
The upper part because heat rises. But using the plastic on only part of the window won't help much. Insulation is trapped air. Heat travels more slowly through trapped air than it can through a solid object like a window frame. If you cover only part of the window there is no trapped air. A convection current will occur behind the plastic- warm air will rise up the side closer to the interior as cold air drops down the side closer to the cold glass.