Imagine having a toasty place to sit or sleep in the dead of winter. It’s fairly easy to make heated earthbag benches and beds. All you do is run PEX or copper tubing between courses of bags. The bench or bed could be heated from a water jacket on a wood stove or you could just tap into one of your hot water lines. Final bench size is usually about 15” high x 18”-24” deep, but you can make any size you want. You can make the bench as fancy as you want – add a sloping backrest, embed objects in the plaster, add cushions and so on. This is a great way to use thermal mass to store heat inside your home.
The drawing was edited with input from readers. Special thanks to Robin and r_w for their suggestions. I was thinking about how to store lots of heat in extremely cold climates, but their tubing method is simpler and probably good enough for most cases.