Of course what they overlook is the electric heating requires electricity which is inefficient in that there are system losses in the lines from the generation plants to the home. And to offset those losses more electricity must be generated, currently by fossil fuel and maybe an old-style nuclear plant (if any are still operating). And further, as those are decommissioned in favor of renewables, the cost of generating becomes greater and the possibility of outages becomes higher also (many decentralized sources of power become subject to storms, wind or ice on blades and power lines will decrease reliability). So what has been a reliable source of heating at a reasonable cost will lose both of those in the era of all renewables.