Use a ladder to carefully reach the top of your roof and use the clips that come with the cables to attach the cable to the roof.
Roof coils to melt the snow.
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To be fair heat cables are pretty inexpensive so it s worth a try especially if you can go up on the roof yourself and attach them.
In this video master electrician for ask this old house scott caron helps a homeowner install heat cables on his roof to stop ice dams.
Install heat cables to melt the snow at the edge of the roof.
Ice is not porous and will trap water.
As for when to use them they are intended to prevent ice build up when temperatures are causing.
Snow is porous and allows water to flow.
These are also called deicing cables and they can be found at your local hardware store or online.
They will melt snow ice in direct proximity but if you have 3 feet of snow most of it will likely stay there.
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Clip in the cable along the same zigzag pattern as the shingle clips.