A common problem in fall with a air tight home. Condensation indicate a low air change rate and high indoor humidity. Crack a couple windows and allow extra fresh ventilation. That will allow outside dry air into the home and remove the build up of summer humidity. Warming the home helps avoiding condensation on the windows. Extra ventilation is required for several weeks to dry the home. A little sweat is ok but the dripping onto the sill is tobe avoided. MOre ventilation!