Houthaven is a 100% climate neutral district under construction. For the climate control in livings, the Houthaven chose for the combination of city heat and comfort cooling from surface water. The entire energy demand in the Houthaven is being generated sustainable. To achieve this, they build on the principle of the ‘trias energetica’: this leads to a promising package of energy saving and sustainability measures. The livings will get a sustainable casco, and for the heating the Houthaven will be connected to the city-heating network. This way the district ensures that every house saves 80 percent on CO2-emission in comparison to the situation with a boiler and airco. The heat that is being used in this case, releases by the generation of electricity from waste incineration from the Afval Energie Bedrijf (AEB). Besides city heat Westpoort Warmte offers also sustainable cooling. The cold warmth is being withdrawn to the Ij water and partly saved in the soil as a buffer during warm summer days. It’s the first time that city heat and sustainable cooling on such a large scale in a district is being applied.