You are weighing the economics of installing a triple-glazed energy efficient window system in your building. The following life cycle costs and savings are provided. The study period is 25 years, and the discount rate is 10%. Is this an economically viable approach based on the Savings-to-Investment Ratio (SIR)? Triple- Glazed Energy Efficient Windows: Window Quantity takeoff: 10000 sf Initial Cost: $100/sf Annual Operating Costs: $2.5/sf Annual Energy Saving: $10/sf

You are weighing the economics of installing a triple-glazed energy efficient window system in your building. The following life cycle costs and savings are provided. The study period is 25 years, and the discount rate is 10%. Is this an economically viable approach based on the Savings-to-Investment Ratio (SIR)? Triple- Glazed Energy Efficient Windows: Window Quantity takeoff: 10000 sf Initial Cost: $100/sf Annual Operating Costs: $2.5/sf Annual Energy Saving: $10/sf