A temporary fix is to put up 3m film on the inside.  It has a removable tape and you get it to tighten and be almost clear by heating it with a hair dryer.  With two people it is easy to do and not real expensive and almost invisible.  The frost king brand at some home depots and stuff is not as nice.  Other wise install an insider storm window.  You can always remove the glass in the summer and have a screen if it has one.     Al Noftz   Also you may want to put the uv blocking film on the inside of the window to stop fading the the stuff in the gallery.  You basically wet the window, apply the film and cut out the edges with a razor blade.  Easily removable.  Don't need experts to do any of this!

On Mon, Dec 11, 2017 at 1:05 PM, leonard cicero <[log in to unmask]> wrote:
My institution began in an historic home.  We currently use the interior of the home as exhibition space.  A constant problem has been regulating humidity levels in the galleries.  The windows of the home are leaded glass and drafty.  After recently updating the humidifiers, we now are experiencing condensation on the interiors of the windows of the old home.  We have the shades drawn to limit the light levels on the artwork residing in the galleries, which is preventing the heat from warming the interiors of the windows.  The condensation is forming between the shades and the windows.

Does anyone have similar experiences with this problem?  I would appreciate suggestions on how to insulate the windows without attaching anything to the interior walls or exterior of the building.  

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