Live in a 95 year old house with 20+ double hung windows. Some of those on the second floor frost up between the storm and double hung. 'Tis a conundrum that I have not been able to solve.
The double hungs have had their weights removed and the cavity stuffed, properly, with insulation. Also, have installed aluminum tracks for all windows. Can't replace the frames because SWMBO (she who must be obeyed) likes the curvey glass. C'est la Vie! Both floors' windows have been treated alike.
Have replaced insulation with styro foam in the affected windows which helped a little but not completely.