This is how buildings heat and cool, mostly - every part of a structure that can see the sky allows radiative heating AND cooling. People forget about the second part.
And this is why we built our current house on a north facing slope, in a forest - against all common wisdom about siting.
Place stays cool in the summer, warm in the winter - the other side of the valley literally caught fire this summer, and gets intense cycles of cooling in the winter, as it gets only ~4h of sunlight and 20h of radiation - our more sheltered side gets 0h of sunlight, but the slope and tree cover drastically reduce radiative cooling at night - it’s insane how much the temperature varies as you walk around at night, and you can feel the katabatic winds flowing down the valley and side valleys.
And this is why we built our current house on a north facing slope, in a forest - against all common wisdom about siting.
Place stays cool in the summer, warm in the winter - the other side of the valley literally caught fire this summer, and gets intense cycles of cooling in the winter, as it gets only ~4h of sunlight and 20h of radiation - our more sheltered side gets 0h of sunlight, but the slope and tree cover drastically reduce radiative cooling at night - it’s insane how much the temperature varies as you walk around at night, and you can feel the katabatic winds flowing down the valley and side valleys.