Focus on the difference between feasible alternatives. Insulated concrete forms (ICF) can be used as a substitute for conventional wood framing in building construction. Heating and cooling bills will be about 50% less than in a similar wood-framed building in upstate New York. An ICF home will be approximately 10% more expensive to construct than a wood- framed home. For a typical 2,000 ft? home costing $120 per ft2 to construct in upstate New York and costing $200 per month to heat and cool, how many months does it take for a 2,000 ft? ICF home to pay back its extraconstruction cost