Surprised that no one here has mentioned inflation and that the gas markets have been screwed with since covid and the Russian invasion of Ukraine. There is a lot of factors at play that make natural gas that heats homes much more expensive.

Anyway, a lot of great tips in the comments here on what YOU can do to have a more energy efficient house.

Personally, I put plastic up on the windows, makes a huge difference. If this was my forever home I would definitely add insulation into these old AF walls.