I find I need more of a selection. I need more sizes, smaller and larger, that can open. An adjustable-sized window that can open would be so awesome!

I would like to see full double hung windows. The ones we have right now only open from the bottom up, which can be fine but that style was designed to open either the bottom or the top.

I would also appreciate outward opening casement windows; not just a single hinge like the existing ones, but also ones that open from the center such as old European styles do