I won't speak to cooking. But, gas central air heaters are much cheaper to operate than heat pumps in Phoenix, AZ. I wish it wasn't so environmentally speaking. But from a cost point of view, its better to use natural gas than electricity.
EXTREMELY low. I was shocked in the PNW when we switched to a house with natural gas appliances how much we saved.
In some cases they are not even superior appliances but you save so much money.
A gas furnace is just a few sensors, a burner, a fan, and a box to do it in.
I think you might be underestimating the # of components in a modern furnace.
... gas furnace + A/C compressor is another story.
Are be subsidizing the natural gas suppliers or adding fees to natty generation plants?