Why Is My AC Unit Freezing Up? Causes and Fixes Explained An AC unit freezing up might seem like a minor issue, but it’s actually a warning sign that something in your system isn’t working properly. The most common causes come down to two things: restricted airflow and low refrigerant levels. When airflow is blocked due to dirty filters, clogged coils, or closed vents, the system can’t absorb enough heat, causing the evaporator coil to drop below freezing and form ice. Read the full guide here: https://callgunnys.com/blog/why-ac-unit-freezing-up/