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Archae have to be keept at the right temperature, at about 37°C. In temper and cold climate this gets difficult especially with small scale digesters. There are two options available: heating and / or insulation.
Placing the digester inside a compost keeps the digester warm. This method is also called the Jean Pain method.
The digester needs its food in a mixture with water in a ratio 1:1. The water could or even should be hot water in order to keep the digester on temperature
Solar C³ITIES showd in 2015 that it is possible to have a spray foamed IBC opened with a sun facing window. 1
http://www.solarcities.eu/projects/passive-solar-heated-insulated-solar-cities-ibc-biodigester-tillson-new-york - Solar C³ITIES project ↩︎