We're looking at a new house and it's propane fueled. They took out the oil tank and put in a giant underground propane tank so it could be bought in bulk, I guess. I understand it's cleaner and more energy friendly. But I also think it's double the cost of oil and natural gas, which is what we use now. There is no fireplace. Seems to be owned by a v. environmentally friendly guy so I imagine that's why he did it. Can anyone shed some light on pros and cons?