NATE Air Conditioning and Heat Pumps Practice Exam 2025 – All-in-One Guide to Master Your Certification!

Inspecting filters and refrigerant levels is a crucial troubleshooting step when a heat pump is not providing sufficient heat. Clogged filters can restrict airflow, leading to inadequate heating performance. Similarly, low refrigerant levels can indicate a leak or insufficient charge, preventing the heat pump from effectively transferring heat. By addressing these issues first, you can often restore the functionality of the heat pump without the need for more drastic measures.

In contrast, replacing the entire unit could be unnecessary, especially if minor issues like dirty filters or low refrigerant are the cause. Increasing the duct size might be irrelevant and could require significant modifications to the HVAC system without addressing the immediate problem. Reducing the thermostat setting would also not resolve the issue of insufficient heat; it would actually make the problem worse by further lowering the temperature in the space.