Looks at choices for HVAC system designers, the nature of today's changes, the Energy Star office equipment programme of the Environmental Protection Agency and Department of Energy, where office equipment is designed to power down to a nominal power level when not in use, the impacts of meeting ASHRAE Standard 62-1989 and how energy cost savings alone will pay for meeting those changes while dramatically improving comfort and worker productivity. Argues that the only way to consistently control temperature in each module of office space is to meet modular load change with individual control of each module of space.