A Swedish hospital stores winter snow and pumps its meltwater through the building in summer

A hospital in Sundsvall, central Sweden, used an unusual cooling system that stored winter snow for use during summer.

The snow was kept in a large, insulated storage area and its meltwater was circulated through the hospital to provide cooling.

Researchers found that insulation was essential, as unprotected snow would melt by mid-June.

The study showed that stored snow could meet the hospital's cooling demand from May to August.