A rammed-earth wall spends the desert heat slowly — it stores the afternoon and releases it through the cold coastal night.

11.2 hr

Thermal lag through a 450 mm pozzolan-earth wall, measured on the Lima coast 3.6 hr longer than fired brick Peak interior temperature arrives near midnight, not noon — cooling demand falls with the dunes.

Earth–pozzolan 11.2

Solid brick 7.6

Hollow block 5.1

Light frame 2.7