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Hi John,

ACF did some work on this in Mongolia. Even at a larger scale than household level, they concluded that composting without adding heat was possible only in summer. However, they also concluded that it was possible (at least at a larger scale) to compost the entire year's waste during the summer. An external evaluation can be found here: https://www.urd.org/IMG/pdf/URD-TDM-ACF_Mongolia_WaSH_evaluation-final_report-June_2015.pdf and they also developed a manual for composting in cold coutries which you can find here https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/2389

This is based on an actual research project - hope it's helpful. Of course, most cold places are not as cold as Mongolia.

Cheers,

Maryanne