I'm trying to calculate the value of wood burning in my area vs the price of LP given my appliances and need a check on my maths. This is simply a cost/performance comparison when purchasing processed wood vs buying a gas. Your mileage may vary depending on how you get your fuel and the prices in your area. Also the efficiency of your appliances. We'll use a common variety hardwood, one that I've burned a lot of my first season. Sugar (hard) Maple, closely comparable to Northern Red Oak, yet lower in BTU value than Hickory which seems to be a more common variety in the Mid West/South Atlantic. Hemlock is as comparable in BTUs on the West Coast areas. Wood Application Wood: Sugar (hard) maple BTUs per cord: 24,000,000 Average price per cord (green) in North Eastern USA: $250 C/S/D Efficiency of wood burning appliance: Average 75% Effective BTUs per cord: 18,000,000 Gas Application Appliance: Goodman, LP forced air BTU's per Gallon of LP: 91,502 Average price per gallon: $2.40 Efficiency of LP burning appliance: 96% Effective BTUs per gallon: 87,842 To make to cost comparison I'm bringing LP in gallons to 104:1. This will put us at $249.6 or equal to the cost of a cord of hardwood cut, split and delivered. End Result: Effective BTUs per cord of wood: 18,000,000 (unchanged) Effective BTUs per 104 gallons of LP: 9,135,568 Effective price: $250 Wood appears to be nearly 2x's more cost effective than LP for shear BTUs given the efficiency of the appliances listed. Sites: http://worldforestindustries.com/forest-biofuel/firewood/firewood-btu-ratings/ https://www.amerigas.com/amerigas-blog/2012/march/geeking-out-over-propane https://jotul.com/us/products/wood-stoves/jotul-f-500-oslo--50528 Could not site my LP furnace as I'm unsure which model it is exactly. I do know it is a 96% efficient model. Please let me know if my numbers are fudged up.