Which device is not commonly used to control temperature within a building or building zone?

Which device is not commonly used to control temperature within a building or building zone?

• A. Humidifiers
• B. Thermostats
• C. Heaters
• D. Chillers

Answer: (A)

Temperature control in a building is achieved by devices that directly affect the air temperature or regulate the HVAC system to reach a setpoint. Heaters provide heat to raise temperature, chillers remove heat to cool, and a thermostat acts as the control point that senses temperature and signals the equipment to adjust. Humidifiers adjust moisture in the air and are used for humidity control rather than directly setting or changing the air temperature. They can influence perceived comfort, but they do not actively control the air temperature. So humidifiers are not commonly used to control temperature, which makes them the correct choice for this question.

Temperature control in a building is achieved by devices that directly affect the air temperature or regulate the HVAC system to reach a setpoint. Heaters provide heat to raise temperature, chillers remove heat to cool, and a thermostat acts as the control point that senses temperature and signals the equipment to adjust. Humidifiers adjust moisture in the air and are used for humidity control rather than directly setting or changing the air temperature. They can influence perceived comfort, but they do not actively control the air temperature. So humidifiers are not commonly used to control temperature, which makes them the correct choice for this question.