节能要求将手动调节改为自动控制。因此，设计参数更容易保持规定。系统操作知识“预先”允许在调试期间更好地了解系统的操作。最近在局部回路控制方面的改进使控制系统能够在安装前，通过工厂校准或“内置”系统的实际设定点或参数进行设计和制造。本文介绍了近十年来本地环路控制系统的改进。 这将表明，气动控制虽然存在了很长一段时间，被认为已经过时，但并没有消亡，或者就此而言，并没有走到路边。相反，气动控制与最先进的计算机控制系统结合在一起，仍然是暖通空调系统理想的控制装置选择。引文:研讨会，ASHRAE交易，1984年，第90卷，pt。密苏里州堪萨斯城2B

Energy conservation dictates a redirection of manual adjustment to automatic controls. Consequently, designed parameters are more apt to remain as prescribed. System operation knowledge "up front" allows for better understanding of the system's operation during commissioning. Recent improvements in local loop control have enabled control systems to be designed and manu­factured with actual set points or parameters factory-calibrated, or "built in", to the system prior to installation.This paper covers the enhancements incorporated in local loop control systems over the last ten years. It will show that pneumatic control, although in existence for a long time and considered outdated, has not died or, for that matter, stepped to the wayside. Rather, pneumatic control has joined with state-of-the-art computerized control systems, remaining a desirable control arrangement choice for HVAC systems.