District Energy & Thermal Network Equipment worked example

Insulation Payback with insulation upgrade investment of 62,500 $: a worked example

Push insulation upgrade investment up to 62,500 $ and the picture changes. This example computes every intermediate figure at that operating point. Use it when insulation payback in district energy and thermal network equipment is being compared against another district energy and thermal network equipment project for the same budget.

The inputs for this scenario

  • Insulation upgrade investment: 62,500 $ (raised for this scenario; the documented default is 25,000)
  • Annual avoided thermal-loss cost: 18,000 $ / yr (unchanged)
  • Annual insulation upkeep cost: 2,500 $ / yr (unchanged)

Working through the calculation

  • Applying the documented formula (Net annual insulation savings = annual avoided thermal-loss cost - annual insulation upkeep cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 4.03 yr for insulation simple payback period, the number this scenario is built around.
  • At this operating point the engine returns 15,500 $ / yr for net annual insulation savings.
  • At this operating point the engine returns 62,500 $ for insulation upgrade investment.
  • At this operating point the engine returns 15,000 $ for five-year net insulation value.

How this compares with the baseline

  • Against the tool's baseline example, where insulation upgrade investment sits at 25,000 $ and the headline result is 1.61 yr, this scenario comes in 150% above the baseline at 4.03 yr.
  • It computes net annual savings as avoided thermal-loss cost minus upkeep, then divides the investment by that net to give simple payback in years. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Insulation simple payback period: 4.03 yr (headline result)
  • Net annual insulation savings: 15,500 $ / yr
  • Insulation upgrade investment: 62,500 $
  • Five-year net insulation value: 15,000 $

Run it with your numbers

  • Every input above is editable in the live Insulation Payback calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.