What can cause short cycling in HVAC systems?

Short cycling in HVAC systems refers to the unit turning on and off more frequently than it should, which can lead to inefficiency, increased wear and tear, and discomfort within the conditioned space. The correct answer highlights two primary causes: thermostat issues and oversized systems.

When a thermostat is faulty or improperly calibrated, it may inaccurately sense the temperature, causing the system to turn on and off too frequently. This can disrupt the intended operational cycle and hinder the overall efficiency of the system.

Additionally, an oversized HVAC system will heat or cool a space more quickly than necessary, leading to a rapid reach of the set temperature and triggering the thermostat to shut off before the system can complete its full cycle. This is counterproductive, as the system never runs long enough to effectively dehumidify or distribute air evenly throughout the space, further contributing to short cycling issues.

In contrast, while dirty filters can restrict airflow and potentially cause some operational issues, they are not the direct cause of short cycling. Similarly, while improperly installed ductwork can impact system performance, it does not inherently lead to the frequent cycling depicted in short cycling scenarios. Lastly, incorrect thermostat location can result in temperature inaccuracies but is not as prominently linked to short cycling as the combination of thermostat issues and