For this workshop, we identified key elements of "effective actions" to prevent and mitigate inequitable health risks from one of climate change's most pervasive, critical aspects–extreme heat. This workshop convened people with lived experience, environmental health, economic, and racial justice experts, climate scientists, energy specialists, and individuals who work on sustainable planning and disaster relief. Together they explored a diverse set of real-world challenges affecting different communities and innovative actions being pursued to prevent, adapt to or mitigate the health consequences of extreme heat.