Heat risk is often underestimated. Heatwaves are among the most dangerous and deadly of natural hazards, but their health impacts, death tolls, and impacts on urban infrastructure, energy and other issues such as crime, are not always visible. Communicating about health risk ahead of and during a heatwave, and encouraging simple risk-reduction actions, is proven to be very effective at reducing risk for heat-vulnerable groups. This Home Cooling Tips messaging toolkit provides materials that can help to raise awareness of heat risk, and the compounded risks of heat and COVID-19, in your city. It promotes easy, low-tech and low-cost measures residents can take to stay cool in their homes. The Toolkit includes media talking points about heat risks in cities.