Nate Core Practice Test 2025 – Comprehensive Exam Prep

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What is the main function of a humidistat?

To control temperature levels in an HVAC system

To measure and control humidity levels in indoor environments

The main function of a humidistat is to measure and control humidity levels in indoor environments. It acts as a sensor that detects the moisture content in the air and either initiates or stops the operation of humidifiers or dehumidifiers based on the set humidity levels. This is important for maintaining comfort, health, and the integrity of structures and furnishings, as excessive or insufficient humidity can lead to issues like mold growth, wood warping, and respiratory problems.

While controlling temperature is an important function of HVAC systems, that role is specific to thermostats. Air filtering and regulating airflow through ducts are also vital functions within HVAC systems, but those roles are handled by air filters and dampers, respectively. The humidistat's exclusive focus on humidity allows it to effectively maintain a balanced and healthy indoor environment.

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To filter the air within HVAC systems

To regulate airflow through ducts

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