I used 5 tons of coal last year. Could be 5.5 this year with the severe weather.
Propane = 263 gallons/ton of coal based on Btu output.
5.5 tons x 263 gallons propane = 1446.5 gallons of propane to equal my current comfort.
1446.5 x $4.00/gallon = $5786 OMG Coal equivalent = $1292
So, my heating cost could have been $5786 if using propain... But like I might have mentioned on another post. I couldn't do it. I would need to shut down parts of the house and live with 60 degrees and burn wood pellets. My pellet stove isn't big enough to heat the house during winter months..