Cost-driven design optimization Problem Select the best alternative: What attic insulation thickness is best for a home in Fairbanks Alaska: R11, R19, R30, or R38? The cost to heat a house in Fairbanks is $82.70/1,000,000 Btu. Without insulating an attic the cost is $8270. The cost of insulating a 2400 sqft attic with different amounts of insulation is given in the table below. R11 600 A. Investment Cost, $ B. Cost of heat loss per year C. Cost of heat loss over 25 years D. Total Life Cycle costs (A+C) Amount of Insulation R19 R30 900 1300 Investment Cost, $ Annual Heating Load, Btu/year 74 x 106 69.8 x 106 67.2 x 106 66.2 x 106 Determine the cost of heating a Virginia home with the above amounts of insulation. R11 600 Amount of Insulation R19 900 R38 1600 R30 1300 R38 1600