Abstract: The present invention is directed to a double hung window assembly and methods of manufacturing the double hung window assembly. The window assembly includes upper and lower sash assemblies, opposing side jambs, and a pair of opposing jamb liners that each have a length generally equal to a length of the opposing side jambs. At least one jamb recess is located between sash tracks on each of the jamb liners. Each jamb recess retains a jamb filler having a length generally equal to the jamb liner length. Each jamb filler has outer and inner weather stripping recesses, and outer and inner weather stripping. The jamb filler may include a primary exposed surface that is substantially unobstructed by the inner and outer weather stripping. A portion of the outer and inner weather stripping may be compressively secured between the jamb filler and a portion of the jamb liner.