Heat
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Heat is a Resource, and a gameplay concept of protection against cold and low temperatures. Operating certain Districts, namely the Housing District, the Central District, and the Food District will increase the need for it as a resource Demand. It is produced from 
Coal in the Generator.
Heating can also be generated with the Heat Recycling law once the Adaptation version of Waste Heat Conversion is researched in the Idea Tree and can be reduced by certain "Area Bonus" adjacency bonuses by smart placement of districts between each other.