Coils freeze up on air conditioners .

 Why do coils freeze up on air conditioners?

 • Low Refrigerant Levels: 

Not enough refrigerant causes the coils to get too cold.

 • Poor Airflow: 

Dirty filters, blocked vents, or a bad blower motor restrict airflow, causing condensation to freeze.

 • Dirty Coils: 

Dust and grime on the evaporator coils insulate them, leading to freezing.

 • Thermostat Issues: 

If a thermostat keeps running the system without allowing off cycles, freezing can happen.

 • Mechanical Problems: 

Things like a stuck expansion valve or bad sensors can cause freezing too.

In simple terms: 

anything that lowers heat transfer or airflow can cause coils to freeze.