focus on the difference between feasible alternatives ​(principle 2loading...​)! insulated concrete forms​ (icf) can be used as a substitute for conventional wood framing in building construction. heating and cooling bills will be about ​% less than in a similar​ wood-framed building in upstate new york. an icf home will be approximately ​% more expensive to construct than a​ wood-framed home. for a typical ft home costing ​$ per ft to construct in upstate new york and costing ​$ per month to heat and​ cool, how many months does it take for a ft icf home to pay back its extra construction​ cost?