August 2024. City of Toronto. Addressing extreme heat exposure has become a priority for cities in the Greater Toronto and Hamilton Area (GTHA). Like many across North America, some cities are exploring or implementing maximum temperature bylaws as a solution. Maximum temperature bylaws are local regulations that set an upper limit on indoor temperatures in residential buildings to ensure safe and comfortable living conditions during extreme heat events.
Thoughtful bylaw design including a predictable and phased approach, along with support for building owners and coordination with climate
action, are needed to ensure an equitable and successful outcome.
This policy briefing provides examples of bylaws from across North America and outlines design considerations for climate and equity.