Nate Core Practice Test 2025 – Comprehensive Exam Prep

A common issue that can impact the efficiency of an HVAC system is the presence of dirty air filters or blocked ducts. When air filters are clogged with dust, dirt, and debris, they restrict airflow, which forces the system to work harder to maintain the desired temperature. This results in increased energy consumption and can lead to wear and tear on system components, potentially reducing the lifespan of the HVAC system.

Blocked ducts can similarly hinder airflow throughout the home or building. This obstruction can create pressure imbalances, causing certain areas to not receive adequate heating or cooling. As a result, the HVAC system must operate longer and more frequently to compensate for these inefficiencies, ultimately leading to higher energy bills and possible system breakdowns.

In contrast, inadequate insulation, old thermostat models, and low refrigerant levels can also affect HVAC performance but may not be as directly tied to the immediate airflow and energy demands of the system as dirty filters and blocked ducts. While these factors are important and require regular attention, the most immediate and common issue tends to be related to airflow obstructions.