When like temperatures are experienced in a single zone system, it is likely the system is __________.

• A. Overbalanced
• B. Underbalanced
• C. Unbalanced
• D. Balanced

Answer: (D)

Uniform temperatures across a single zone mean the airflow is balanced. In this setup, balance means the amount of air being delivered and returned is matched to the zone’s design so air is distributed evenly and the thermostat can maintain the setpoint. When the system is balanced, you won’t have hot or cold spots and the temperature stays consistent. If the system were overbalanced, some areas would receive too much air (and possibly feel drafty or cooler near vents), while underbalanced conditions would leave other areas undersupplied and warmer. So like temperatures indicate the system is balanced.