All of the other windows in our Queenslander are casements, but we are putting a set of double hung windows in the kitchen because it opens onto a servery (and bi-folds were too expensive) - see attached. My question is whether I should put 1 or 2 lifts (the J-shaped fittings you use to lift the window) on each window? What do most other double hung windows have? Or is there no standard way of doing it?