Increase Heat Flows by Radiation

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The building should have large windows and/or dark colors in walls and roofs

The strategies to achieve this are:

Increase heat gains by radiation from the sun

Increase window sizes, especially southern windows in the northern hemisphere or northern windows in the southern hemisphere.

Use dark colors in walls or roof

Zones:
The “increase radiation” zone is  between 10 C (50F) up to 21 C (70F). Below the lower limit of this zone, heat gains during the day through the windows will not be greater than heat losses at night through these same windows, unless their U value is greatly increased.

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