Updated:
01-27-2017
This calculator determines the simple payback period, the annualized rate of return, and the NPV from an insulation project.
Instructions
- Line 1. Enter the cost of installing or replacing insulation
- Line 2. Enter the estimated savings during the first year
- Line 3. Enter the projected annual energy cost escalation rate
- Line 4. Enter the estimated useful life of the insulation system
- Line 5. Enter the discount rate for Net Present Value calculation
Note: Calculator ignores any savings after 20 yrs
Assumptions
- Simple payback period is calculated as the initial cost divided by the first year savings
- Assumes investment and annual savings occur at end of year
Note: Calculator may be used for a single item or an entire project
