Door closers contribute to energy efficiency by ensuring that doors are not left open, allowing for the escape of heated or cooled air. In both residential and commercial buildings, this can lead to significant energy savings by reducing the workload on heating, ventilation, and air conditioning (HVAC) systems. Automatic door closers are particularly effective in this regard, as they eliminate the need for individuals to manually close doors, ensuring that they are always properly sealed. This not only reduces energy costs but also minimizes the environmental impact of excessive energy consumption.