Kentucky HVAC Journeyman Practice Exam 2025 - Free HVAC Journeyman Practice Questions and Study Guide

When addressing short cycling in an HVAC system, checking the thermostat calibration and inspecting airflow is crucial because these factors can directly impact the system's performance. Short cycling occurs when the system turns on and off frequently, which is often a sign of underlying issues that need to be resolved.

Firstly, a miscalibrated thermostat can cause the HVAC system to run erratically. If the thermostat isn't reading the temperature accurately, it may cause the system to cycle on and off at inappropriate times, leading to discomfort and inefficient operation. Correctly calibrating the thermostat ensures that the HVAC system runs according to the desired temperature settings.

Additionally, inspecting airflow is essential. Restricted airflow can lead to overheating of the system, causing it to shut off prematurely as a safety measure. This can happen due to clogged air filters, blocked ducts, or other obstructions. By ensuring that airflow is optimal, the system can run smoothly and efficiently without the risk of short cycling.

Therefore, addressing both thermostat calibration and airflow issues targets two of the most common causes of short cycling, allowing for an effective resolution without the need for more drastic measures like replacing the entire system or increasing its size.