Which system is not considered a hydronic system?

Hydronic systems use water as a heat transfer medium to provide heating or cooling to a space. They typically consist of components like boilers, pipes, radiators, and various terminal units that utilize heated or cooled water to maintain a comfortable temperature in the environment.

In the case of window AC units, they operate using refrigerants rather than water to transfer heat. These units employ a vapor-compression cycle, cooling the air directly and blowing it into the living space without utilizing a water-based system. Their function is focused on air conditioning, rather than the hydronic heating and cooling approach.

Understanding the mechanics of hydronic systems helps to distinguish them from systems such as window air conditioning units, which are fundamentally different in design and operation, prioritizing air cooling instead of using water for temperature regulation.