Low-emissivity interior wall strategy for suppressing overcooling in radiatively cooled buildings in cold environments

•Low-emissivity interior wall strategy is proposed for overcooling suppression of radiatively cooled buildings.•The radiative insulation effect is experimentally demonstrated when overcooling occurs.•Heat loss of humans in buildings can be reduced by over 30% in cold seasons based on the strategy.•Interior walls with dynamic emissivity can further save energy for radiatively cooled buildings.