Hi, I have a Thermopride wood/coal furnace. It probably has about 4 years of burning that was done in it. With the price of oil I was thinking of burning pellets then I heard of these bio logs which seem like pellets made into logs. Can someone advise me on this? How many tons = a cord? Trying to figure out how many tons I would need. Cord wood is too messy (and buggy) and coal is just too dirty. thanks in advance