What characterizes a single zone system?

A single zone system is defined as one that controls temperature in a single area or zone, meaning it regulates the climate for one specific space without managing different temperatures for multiple areas. This type of system typically includes one thermostat that dictates heating or cooling for the entire zone, providing a uniform temperature for all occupants within that particular space.

In contrast, a system that controls temperature in multiple areas would be categorized as a multi-zone system, which can provide different temperatures and settings for various zones based on individual preferences or requirements. Options reflecting variability in heating and cooling demand or the use of outside air for cooling pertain to other sophisticated climate control strategies that are not limited to the specific characteristic of a single zone system, thereby not accurately defining it.