A polymer window assembly includes a polymer window frame with a pair of jambs and a sill, and a glass unit carried by the window frame. A pair of brackets are attached to the jambs proximate corners between the jambs and the sill. Each bracket has an upright member, a horizontal member orthogonal to the upright member and a hook attached to a rear surface of the upright member. The brackets attach to the jambs so that the hook extends through a hole in the jamb, the upright member is adjacent a surface of the jamb and the horizontal member is disposed above (e.g., spaced above) the sill. The brackets support and transfer the weight of the glass unit to the jambs to inhibit (e.g., prevent) the sill from bearing the load of the glass unit, thereby inhibiting (e.g., preventing) the crushing or bowing of the sill by the glass unit and thereby inhibiting (e.g., preventing) the formation of gaps in the window assembly that allow for air and/or water infiltration through the window assembly.