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A few thoughts:
I think central furnaces are a lot more because the entire system is so much less efficient (ducts, blowers, etc.) and you have to have electricity to move the large fans to move all the air around.
Regarding general costs, see the calculators here:
http://www.hearth.com/econtent/index.php/articles/fuel_cost_comparison_calculator/
http://www.woodpelletinfo.com/calculator/
Both show that at $200 - $300 per cord (which we'd have to pay) that gas is cheaper. Wood would have to be $175 a cord to break even at $0.98 per therm for gas.
I don't really have access to free wood, but even if I did, I'd have to rent a splitter, split, stack, haul, etc. which has costs and dangers involved.
So, I'm kinda back to square one.
I think central furnaces are a lot more because the entire system is so much less efficient (ducts, blowers, etc.) and you have to have electricity to move the large fans to move all the air around.
Regarding general costs, see the calculators here:
http://www.hearth.com/econtent/index.php/articles/fuel_cost_comparison_calculator/
http://www.woodpelletinfo.com/calculator/
Both show that at $200 - $300 per cord (which we'd have to pay) that gas is cheaper. Wood would have to be $175 a cord to break even at $0.98 per therm for gas.
I don't really have access to free wood, but even if I did, I'd have to rent a splitter, split, stack, haul, etc. which has costs and dangers involved.
So, I'm kinda back to square one.