Multi-country, remote survey to evaluate the interplay between COVID-19 mitigation measures, heat-health and livelihoods for populations living in densely populated urban areas. Survey data available for Pakistan, India, Indonesia and Cameroon. Data collected remotely via mobile phone survey with ~4400 randomly identified respondents. Data available in CSV file format. Data generated as part of the ESRC/GCRF project “Cool Infrastructures: Life with heat in the Off Grid City (ES/T008091/1), with additional funding from the Scottish Funding Council.