本书的第一版为设计新控制系统或维护现有控制系统的从业者提供了暖通空调控制的基础知识。强调基本控制系统原理以及空调过程的湿度测量一直是2006年新版的重点；然而，读者会发现，现有控制系统的基本原理仍保留在本书中，因此那些需要维护或排除20或30岁系统故障的人将能够看到从业者在这段时间内做了什么。本文还介绍了近年来数字控制技术的广泛应用。还包括一个新的重点是控制最低新鲜空气的验证目的。 为了响应ASHRAE标准62.1-2004，开发了新的技术，包括这些方法。本版涵盖了硬件控制系统和现代控制技术。当读者了解到在现场遇到的各种供暖和空调系统类型中使用的各种控制方案时，他们将被提醒与供暖和空调相关的湿度过程。文中还介绍了过去使用的各种控制硬件和控制策略，以及大多数现有供暖和空调系统中普遍使用的控制硬件和控制策略。引用:非ASHRAE书籍

The first edition of this book provided fundamentals of HVAC control to practitioners who were designing new control systems or maintaining existing control systems. Emphasis on fundamental control system principles along with the psychrometrics of air conditioning processes has remained a focus of this new 2006 edition; however, readers will find that the fundamentals of existing control systems remain in this book so that those who need to maintain or troubleshoot systems that are 20 or 30 years old will be able to see what practitioners did during that time frame. The ubiquitous application of digital control technology in very recent times is also described. Also included is a new emphasis on controlling minimum fresh air for validation purposes. New techniques for doing this have been developed in response to ASHRAE Standard 62.1-2004, and these methods are included.This edition covers both hardware control systems and modern control technology. Readers will be reminded of the psychrometric processes associated with heating and air conditioning as they learn of the various controls schemes used in the variety of heating and air conditioning system types they will encounter in the field. Descriptions of various control hardware and control strategies that were used in the past and are prevalent in most existing heating and air conditioning systems are included.