Dallas, TX, here. Extremely hot summers, usually 1-2 snows/winter.
"My" house (the one I lived in when The Sweetie and I met, and is now a rental property) was built in 1957 and is piped for natural gas. It has a gas furnace, which is dirt cheap to run. It was built with little gas-fired heaters in the walls, which I don't use because I'm scared of carbon monoxide.
The Sweetie's house (where we live) was built in the '70s and has an electric furnace. Much more expensive.