Why is my air conditioner iced up inside and how can I fix it?

Your air conditioner may be iced up inside due to restricted airflow, low refrigerant levels, or a dirty air filter. To fix it, you can try turning off the AC to let the ice melt, cleaning or replacing the air filter, checking for any obstructions in the vents, and ensuring proper refrigerant levels by contacting a professional HVAC technician.