what causes house ac to freeze up？
Air conditioners are full of moving parts that can get stuck, broken, or clogged. Refrigerant lines can kink, fans can stop moving, filters can become clogged, and things can leak. Any of these things causes a drop in pressure, allowing the refrigerant to expand too much and become too cold.
Thereof,How do I keep my air conditioner from freezing up?
In this regard,How do you unfreeze an air conditioner fast?