Content View the London Heat Map Explore the interactive London Heat Map. Who uses the Heat Map? Explanation of how different groups in London use the heat map. Resource library Download the carbon calculator tool, publications, reports, user manual and data from the resource library. User feedback We are always looking to hear from users. Give your feedback on how we can improve the London Heat Map. Related content Environment newsletter Sign up now to receive updates on environmental policy, projects, events and opportunities. What is RE:NEW? RE:NEW is the award-winning programme to help make London’s homes more energy efficient. RE:FIT programme The Mayor’s award-winning programme to help make London’s non-domestic public buildings more energy efficient.