Mini Seated Refrigeration Room
With thanks to Rainer Winkler for inspiration. These already exist and are ready to go. If modifications to suits turn out to be impractical maybe a small refrigerated room (Cool Room) would cool workers for a while. These can be bought or fabricated from whatever's available. One issued to each hospital. It doesnt solve the mobility issue but may offer some relief if used every 15 min for a short break.