The humanitarian impact of extreme heat is an increasing concern, especially in low-income countries with limited access to quality healthcare and informal dwellings which can trap heat. This report analyses the knowledge, attitude and practice of Karachi residents in relation to managing extreme heat. It was conducted in 2020 following a messaging campaign led by HANDS related to extreme heat. The project was triggered through a disaster risk financing approach, using a heatwave model to trigger funding automatically when extreme heat was forecast.