The answer to 'furnace freezing up' is that a frozen furnace is usually caused by a problem with the airflow or refrigerant levels. Common symptoms include ice buildup on the coils or vents, reduced airflow, and the furnace cycling on and off frequently. The main solutions are to check and clean the air filters, ensure the blower is working properly, and have a professional technician inspect the refrigerant levels and recharge the system if needed.
A frozen furnace is often a sign of an underlying issue that requires professional diagnosis and repair. While you can try basic troubleshooting like changing the air filter, it's best to call an HVAC technician if the problem persists or you're unsure of the cause. They can properly identify and fix the root issue to get your furnace working efficiently again.