Emergency A/C Repair in Irving Park – Frozen Coil & Low Refrigerant Fixed Fast We responded to a no-cool A/C emergency in Irving Park. Our HVAC techs quickly diagnosed a frozen evaporator coil and line set caused by a dirty air filter and low refrigerant levels. After thawing the system, replacing the filter, and recharging the refrigerant, the air conditioner was back to cooling efficiently. Regular filter changes are key to preventing A/C issues like this.