I am not sure if this was said, but the whole problem starts when the snow melts, the snow melts due to no enough insulation in your attic you are having to much heat loss, heat rises.
I would keep the coils till the spring then I would put soffet vents and proper vents if you have vents on each side of the roof peek that should be fine, a ridge vent is better,
It is said that you should have 15 inches of insulation in your attic.
I have been dealing with ice dams in 2 houses for the last 20 years.
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