My neighborhood has a number of these types of properties. My house is up to date but these relics depress the prices in the neighborhood slightly because of shitty appraisals.
My house should realistically be worth 50k more than it is just because of this.
Over the weekend I had a guy come in and poke a hole right behind the brick wall of my wood stove. My laundry room is right behind one of the walls, and that's where my furnace is. He added a 10 x 10 vent and a duct directly into the return of the furnace (about an 8 foot run). Basically its sucking air directly from the heat of the stove. I measured the air temp in the new duct to be between 80 and 93 degrees.
Since Saturday, I've been experimenting and basically in temps around 40 degrees I now only need to run my furnace after 8 pm thru morning, then I can turn it off. The heat circulating from the stove is basically maintaining the house temp all day. Fuck ya.