Instructions: Read each scenario carefully to answer the computational questions.

Q1: Natural gas is measured in thousand cubic feet (mcf). How many mcf of natural gas will be needed to heat a 2,400 ft² house for 3 months (90 days)? Assume that one square foot (ft²) will require 60 BTUs, and that one cubic foot (ft³) of natural gas is 1,030 BTUs. Show your work.

Q2: If the natural gas furnace for the home above is only 80% efficient, how much will it cost to heat the house in the U.S. for three months if the cost of gas is $6 per mcf? Show your work.

Q3: How much money would a house save annually if it upgraded to a 90% efficient furnace? Show your work.