2-4x seems like a stretch, and would only apply in areas with very high electric rates. My last house was heated with a builder-grade heat pump (HSPF around 8),

2-4x seems like a stretch, and would only apply in areas with very high electric rates. My last house was heated with a builder-grade heat pump (HSPF around 8), and my winter electric bills were around $150-200/mo. My current house has natural gas heat, and similar level of appliances/EVs/lighting, and winter bills electric bills are around $100/mo. This is the same town and the electric rate didn’t change, so the net cost of heating my old house with a heat pump was only $50-$100/mo. Meanwhile my winter gas bill in this house, subtracting baseline summer usage, runs more than that. The only backup heat I had with the heat pump was electric resistance heat, which I needed to use only once or twice each winter for a few hours at a time.