In the summer of 2024, my work as a Duke-Makerere fellow brought me to the Ugandan Cancer Institute (UCI), where one observation sparked this entire project. I watched nurses pour boiling water into a cooler of IV bags, manually checking the water with their hands to warm fluids for surgery. This resourceful but imprecise method was a response to a critical problem we soon quantified: after interviewing staff, we discovered that a staggering 62% of surgical patients at the UCI were suffering from perioperative hypothermia, largely due to cold IV fluids. It was clear there was an urgent need for a safe and low-cost solution.