As much of the United States experiences record-breaking heat, HVAC contractors are working in some of the hottest and most hazardous conditions imaginable—from sun-soaked rooftops to stifling attics, and mechanical rooms. A series of heat domes has pushed temperatures into the triple digits across large portions of the country, putting July 2026 on track to become the warmest July on record for the contiguous U.S. and extending a summer marked by widespread 100-degree days, according to The Washington Post. With heat-related illnesses remaining a serious jobsite hazard, understanding OSHA's guidance on preventing heat illness is more important than ever. Take this quiz to see how well you—and your team—are prepared to beat the heat safely.