I almost lost the battle for casement windows to double hung windows at the beginning of the project.
Even thought casements are more energy efficient (less drafty), require less maintenance,, provide more air movement in the summer, and are less expensive, it was a tough battle!
I discovered it was the offending crank that was the downfall of the casement window in th eyes of my wife. Fortunately they now make folding cranks so the key problem of the crank... getting in the way of blinds is mitigated dramatically.
It also helped that absolutely everyone we discussed windows said that casements were the way to go! And that the architectural design of the Cottage called for them...