Paul from SWISCO responded:
November 29, 2016
Are you able to show where the icing is forming on the window? If it's between the panes, we may not be able to help. Otherwise, we have suggested the 58-053 kerf mounted bulb for Norco casement windows in the past, but that's no guarantee it matches what you have installed now. Look it over and see how it compares.
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