Question

which part of the room is coolest according to the thermal image? the walls around the windows the windows and their frames the radiators under the windows

Explanation:

Thermal imaging shows different heat levels. Windows and their frames often conduct heat more (or retain less heat) compared to solid walls (around windows) or radiators (which are heat - emitting). In thermal images, cooler areas are shown in colors like purple/blue. Windows and frames, being less insulated (compared to surrounding walls) and not heat - generating (unlike radiators), are likely the coolest.

Answer:

the windows and their frames