Painting the outside north-facing wall of a middle latitude house one color and the south-facing wall another color is not a bad idea because on different directions the light from the sun has different magnitude.
Depending on the season and whether you want it to be warmer or cooler, the south-facing wall would be painted a lighter reflecting hue if it is exposed to a lot of solar insolation. There will be variations in sun insolation on each wall. Therefore, using such painting techniques to regulate the temperature within the building would be advantageous.
To learn more about solar insolation here
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