Install heat cables to melt the snow at the edge of the roof.
Roof coils to melt the snow.
As for when to use them they are intended to prevent ice build up when temperatures are causing.
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.
These are also called deicing cables and they can be found at your local hardware store or online.
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They will melt snow ice in direct proximity but if you have 3 feet of snow most of it will likely stay there.
Snow is porous and allows water to flow.
Clip in the cable along the same zigzag pattern as the shingle clips.
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.
Most coils operate by just plugging them in but some will be connected to a switch or thermostat.
Secure shingle clips to roof shingles using a flathead screwdriver making sure to align them in a zigzag pattern.
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