Whats a therm?
Natural gas is billed using an energy unit called a therm. A therm is equal to 100,000 British Thermal Units (BTUs), or approximately 100 cubic feet (1 CCF) of gas. Your meter measures the volume of gas you use in hundreds of cubic feet. Each month, that volume is converted into therms by a BTU Factor that accounts for the actual energy produced by each CCF.