This report gives an overview of San Francisco’s response to extreme heat events, organized by department and area for specific order of response and command. Heat emergencies are often slower to develop, taking several days of continuous, oppressive heat before a significant or quantifiable impact is seen. Heat waves do not strike victims immediately, but rather their cumulative effects slowly take the lives of vulnerable populations. Excessive temperatures greatly impact the elderly, the sick, and the very young due to heat-related complications.