A winter challenge to consider.
When it comes to windows that face the south in the northern hemisphere, however, there is an even bigger challenge to consider. During winter, the sun remains low in the sky, with its light shining more directly on south-facing windows for longer periods of time than in summer. This allows for a unique situation where applied graphics, most notably dark colored graphics, can absorb the heat of the sun more dramatically than at other times of the year. This is especially problematic in the morning when air and glass temperatures are at the coldest of the day. Dramatic temperature differentials across the face of the glass can be generated on bright cold mornings depending on the color of the graphics. Furthermore, since graphics are typically installed in the evening after stores close, the temperature differential from morning to afternoon is much greater (roughly -10°F to 50°F sunup to sundown in winter vs. 60°F to 90°F in summer). That’s a difference of 60°F vs. 30°F — twice the change.