Air quality has an impact in pig performance and worker environment, but over-ventilation can result in wasted energy expenditure. Heating should be provided in cold climate, otherwise air quality will drop if ventilation is lowered, or pig performance will drop as they divert resources to maintaining body temperature. However, heat can often end up being wasted due to oversized fans, too high of a fan speed, high temperature settings, or an oversized heater. Ways to save energy while maintaining the ventilation and heat balance are to run more fans at a lower setting, to allow a second fan to engage prematurely, to replace old fans, and to maintain and manage existing systems to keep them running efficiently.