How many therms are equivalent to 18 CCF of natural gas?

To determine the equivalent number of therms for 18 CCF (hundred cubic feet), it is essential to understand the relationship between these two units of measurement. One CCF of natural gas is approximately equivalent to 1.031 therms.

To calculate the therms for 18 CCF, you can multiply 18 CCF by the conversion factor:

18 CCF × 1.031 therms/CCF = approximately 18.558 therms.

Since options are rounded, we consider the closest whole number. Therefore, when rounding down, the appropriate equivalent would indeed be recognized as 18 therms. This makes 18 therms the most accurate choice among the options provided.

In summary, understanding the conversion factor between CCF and therms is crucial. This knowledge allows for accurate conversions and ensures that energy usage assessments such as those conducted in HERS ratings reflect appropriate calculations.