Abstract: Techniques are described that for reducing the cost and labor associated with replacing a balance system in a window assembly if the balance system fails or needs to be upgraded. In one example, a window jamb liner assembly comprises an elongated jamb liner comprising a back wall, first and second spaced-apart interior track walls extending from the back wall, and first and second spaced-apart exterior track walls extending from the back wall, wherein the first and second spaced-apart interior track walls define an interior track, wherein the first and second spaced-apart exterior track walls define an exterior track, wherein the first and second spaced-apart interior track walls and the first and second spaced-apart exterior track walls extend substantially perpendicular to the back wall, wherein the second interior track wall terminates at a first top edge, and wherein the second exterior track wall terminates at a second top edge.