Does the refrigerant liquid line have to be insulated?

Yes, the refrigerant line set needs to be insulated. This aids in condensation control as well as improved efficiency. The line set we carry that is compatible with this system is insulated. This line set can be purchased separately and can be found on the product page with the other recommended accessories. This accessory section is located under the "add to cart" button. For more assistance please give us a call.