Which type of heating and cooling system is categorized as Group 1?

Group 1 systems are defined as basic heating and cooling systems that provide fundamental climate control. These systems typically consist of a single source of heat and cooling that distributes air or water throughout a space, without the complexities found in more advanced or segmented systems.

The classification is important because it helps identify the level of sophistication, control, and energy efficiency available within different heating and cooling solutions. Basic systems are generally straightforward and may use traditional methods such as furnaces for heating and standard air conditioners or window units for cooling.

In contrast, the other options present variations on this basic concept. Multizone systems introduce complexity by allowing independent temperature control in different areas, variable outdoor air systems manage ventilation more dynamically, and central heating systems involve a broader system design that may integrate more advanced technology. Each of these systems serves specific needs and offers more features, marking a departure from the simplicity and functionality of Group 1 systems.