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I’m guilty of this trend. Painted our house almost black last spring. Brutal summer. No impact to interior or HVAC use/cost as far as I can tell. I’m in Texas fwiw.

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Interesting! Sounds like you have a well insulated structure. One other aspect, however, is the effect on the outdoor spaces on the sunny side of the house. You might find that they are warmer due to the increased radiant heat absorbtion and emission of the dark surfaces.

I’d actually be surprised if it was insulated much at all by modern standards. It’s a mid century construction. My guess is the air gap between the insulation/siding and the masonry is carrying the heat up and out of the attic/roof.

And yes the radiation on the exterior is quite noticeable. It’s being felt by a few bushes.

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