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The glass center feels cooler than the frame in afternoon sun
How useful is it to compare the room-side temperature at the center of a window pane with the temperature near the glass edge and on the frame? In a hypothetical west-facing room, the center glass might feel relatively cool while the frame or surrounding wall feels warmer late in the day. Would that point toward heat coming through the frame or edge, or is surface temperature too limited to say much on its own?
What observations would help separate heat associated with the window or its installation from heat entering through the adjacent wall or air leakage? I wouldn’t want to assume the window is the cause based on touch alone.
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Compare the same spots - the center and edge of the glass, frame, and nearby wall - at several times, noting which areas receive direct sun. A warm patch on the interior wall could be sunlight coming through the glass, so its movement alone wouldn’t show that heat is entering through the wall. The pattern over time is still more informative than touch at one moment.