I believe this first aired in 2006 - making this system at least 10 years old. I have made contact with the homeowner through the original installer and it turns out that it is still working great. Since then, they have upgraded to NEST thermostats but nothing else has changed. They are considering upgrading the equipment to higher efficiency stuff that is available now but still want to keep SmartZone in place.
During the summer months, heat from rooms with large sun-exposed windows can make your air conditioner run more than it needs too. OR these rooms might never get cool. SmartZonecan improve the whole house comfort by directing air to rooms that need more cooling.