This report examines the role of extreme heat in driving new and exacerbating existing humanitarian need. It outlines the extent of current engagement with extreme heat by members of the Disasters Emergency Committee (DEC), particularly within the health and shelter clusters, and analyses current measures to tackle extreme heat across the membership and beyond. Finally, it makes recommendations to DEC members on how responses to extreme heat could be improved. The report draws on case studies from Pakistan and Bangladesh, given their vulnerability to extreme heat and the recent involvement of DEC members in these regions. (From report).