We have listed below a selection of links that standout on the internet as useful resource sites.

• Overview of district heating around the globe - Wikipedia
• International Energy Agency district heating and cooling home page
• Combined heat and power association
• European Commission page of district heating examples
• International District Energy Association
• International Association of district heating, district cooling and combined heat and power
• US National Renewable Energy Laboratory web page on Geothermal Direct Use for Homeowners
• London heat map
• LDA LTGHN project webpage