Soil heating cables to heat entire GH

[Orchidbyte]

I have an 8'x6' double poly Greenhouse, at moment I use a radiant type electric heater to heat GH in winter, were I live the coldest it gets is 27f, this year so far 38f and warm sunny days. Radiant heater does a great job but ground soil stays on cool side.

I was thinking of buying a 100' soil heating cable and run that on my ground area. Ground area is comprised of several verities of plants and a very thick gravel layer.

I am hoping that the cable would heat soil, so that plants in ground will do better with soil heat and also the heat will rise and heat GH.

Do you think that a soil heating cable will generate enough heat to heat GH?

I try to keep GH above 55f in winter, on cold overcast or rainy days I have heater on during day to keep temperature up as much as possible.