Our industry's DDC systems, some of which are up to 20 years old, have performed extremely well with great reliability, and have reduced control maintenance to the point that it has almost been eliminated. This has been of great benefit to building owners.

Highly functional interfaces are presently available that seamlessly connect these existing DDC systems to most vendors' latest and greatest graphical Web-based operating systems. This may fly in the face of the old adage, "If it ain't broke, don't fix it." However, the ease and relatively low cost of completely changing the personality, including the touch and feel, of the existing DDC systems while greatly increasing the overall functionality is starting to tempt system owners. These benefits make upgrading extremely compelling.