Abstract: A window jamb liner assembly for use in the jamb of an architectural window is provided. The jamb liner assembly includes a longitudinally elongated jamb liner having a pair of spaced-apart channel guides. Each channel guide includes a recess in a forward surface thereof and a bracket that extends into the space defined between the channel guides. A jamb liner cover is cooperatively retained by each of the brackets and covers one of the recesses in the forward surface of one of the channel guides. A weather stripping member for sealingly engaging the sash assemblies of the window is disposed in the other one of the recesses of the channel guides and is retained within the bracket of the channel guide having the recess within which the weather stripping member is disposed.