Is there more energy in a gallon of heating oil or a gallon of natural gas?
Heating oil is a liquid. Natural gas is a gas. It is sometimes compressed to a liquid form, but is restored to its gaseous form before it is piped to your home. Because their natural states are so different, the only reasonable comparison is the cost per BTU. Given equipment efficiencies being equal, the cost of creating a BTU of heat is less with natural gas than it is with heating oil.