Frost on outside of triple pane window
Every so often I notice frost/water (depending on outside temp) developing on the outside pane of my triple pane windows. It’s infrequent but will mostly notice it early mornings. Actually, as I sit here this evening (68F indoors, 28F outdoors) the exterior of my windows are frosting up a bit. Interior pane is warm to touch. No moisture problems inside. Air exchange keeps interior moisture around 35-40% in the winter. Moisture (minimal-in bottom corners) only forms on interior windows when it’s -10F and below. Thoughts? Thanks.
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