The Celsius Toolbox aims to be a source of knowledge and inspiration for cities interested in developing district energy (district heating and cooling) solutions. It addresses cities which are just beginning to implement small-scale district heating and cooling networks as well as cities with large established systems endeavoring for even smarter and more efficient solutions.

The Toolbox started as a wiki created within the EU project CELSIUS, sharing experiences and research from the project partners and it is continuously being developed in cooperation with the growing Celsius Network.

The Celsius Toolbox consists of four main elements: