Laboratory testing and computer modeling are important tools we use in consideration of new methods and systems for large building air-conditioning systems. However, when the building is completed and occupied, it is the utility bills and creature comfort we all must live with that determine the degree of success of the project.

Actual performance and experience with the systems and methods must be given equal consideration in new project design.

Some shopping centers with modern systems and control methods have been monitored and compared to older buildings with both original and modern control systems.

The results of actual experiences are always mixed with several events happening at once. Results vary with building type, construction, occupancy, design, location, weather, and any other factors we wish to consider. The results of actual building experiences with various control strategies must be considered using several representative buildings so that a sufficient data bank is established.