What's behind the casement?
When the kitchen window was replaced there was no insulation back there. If we go with replacement windows for the rest of the house there'll be no casement work so no new insulation back there. How big a factor is that insulation? It's expensive to tear out all the casements and do new construction windows (our original choice). Can we take a chance on Okna 500 replacements and leave the casements alone, or do you think we will we regret not getting in there and insulating?