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.