What is the minimum length of line set that can be run between outdoor and indoor unit?

The shortest line set length available for this unit is a 15' line set. However, excess line set length can be gently coiled to shorten the distance. Other line set lengths compatible with this unit include 15', 25', 30', 35' and 50'. All of these line sets can be found on this mini split system's product page. They are located under accessories which are under the "add to cart" button on the right hand side of the screen. For further assistance, please give us a call.