In most places I know of electricity is cheaper than natural gas/heating oil so yeah I guess you would be saving $ on heating costs.
Where in the world are you?
There is absolutely no comparison between gas and electric heat where I am. I paid about $60 a month to keep a 4000 sq. ft house toasty warm with gas last winter.
I'd be better off burning dollar bills to keep warm than paying for electric heat.
I'm in Canada. You know what let me check my gas bill cause I may have spoken with my ass lol :p..one moment plz..nope I was correct..I pay $0.14 per cubic meter of gas, but pay only $0.06 in the winter for electricity.
You need to check your units. a cubic metre of gas is a lot more energy than a kilowatt-hour of electricity.
On equal units:
a gigajoule of natural gas (26.3 cubic metres) costs me $4.55 ($0.1725/cubic metre)
a gigajoule of electricity (278 kilowatt-hours) costs me $24.93 ($0.09/kilowatt-hour)
Even using your prices, natural gas is still way cheaper ($16.68 vs. $3.68).
Oooops
I guess I totally forgot about the total energy content of both sources of energy. So yeah in the end when you take in the total amount of energy required to heat a house with electricity alone natural gas would be cheaper even though on a per minimum unit of consumption basis electricity is cheaper. One can easily get fooled if you don't take the energy content into consideration. I don't think anyone will realistically use miner heat to warm up the house. I think a smarter solution would be to move mining equipment into a room or area where you can shut off the furnace vents or maybe even open up the windows and let in the cold winter air.