How does a compost bin produce heat?

Decomposition of carbon- and nitrogen-rich materials by composting macro- and micro-organisms is the way that compost bins produce heat. The heat represents a mix of influences and inputs from aeration, ambient temperatures, carbon and nitrogen ratiOS, container sizes and moisture levels. The United States Environmental Protection Agency suggests minimum temperature ranges of 104 to 131 degrees Fahrenheit (40 to 55 degrees Celsius).