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In a cold climate, heat is almost 2/3 of home energy use.
Rocket mass heaters are super efficient wood-fired heaters that are pretty much smokeless and use one tenth of the wood of a conventional wood stove. They can be built for as little as a few hundred dollars and a weekend's worth of time.
Using sustainably harvested wood as fuel, or even junk mail, the burn on a well-built rocket mass heater is so clean that installing one could potentially cut 27 tons off your carbon footprint and save many hundreds of dollars per year!