Heating is used to modify an environment by raising the dry-bulb temperature, or to offset the effects of heat loss from a building. The amount of heat required depends upon the use of the building (animal housing, product storage, etc.), the heat flow out of the building, the ventilation needed, and the sources of heat within the building. In buildings used for product storage, a minimum amount of, or no ventilation may be needed, but buildings used for livestock housing must be ventilated to remove the moisture given off by the animals as they breathe and the harmful gasses that can develop in the building.

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