Enter the cost of HVAC before insulation ($), the cost of HVAC after insulation ($), and the cost of insulation ($) into the Return on Insulation Calculator. The calculator will evaluate and display the Return on Insulation. 

Return on Insulation Formula

The following formula is used to calculate the Return on Insulation. 

ROINS = (CBI – CAI) / CI * 100

  • Where ROINS is the Return on Insulation (%)
  • CBI is the cost of HVAC before insulation ($) 
  • CAI is the cost of HVAC after insulation ($) 
  • CI is the cost of insulation ($) 

How to Calculate Return on Insulation?

The following example problems outline how to calculate Return on Insulation.

Example Problem #1

  1. First, determine the cost of HVAC before insulation ($).
    • The cost of HVAC before insulation ($) is calculated to be : 1000.
  2. Next, determine the cost of HVAC after insulation ($). 
    • The cost of HVAC after insulation ($) is measured to be: 500.
  3. Next, determine the cost of insulation ($). 
    • The cost of insulation ($) is found to be: 2,000.
  4. Finally, calculate the Return on Insulation using the formula above: 

ROINS = (CBI – CAI) / CI * 100

The values given above are inserted into the equation below and the solution is calculated:

ROINS = (1000 – 500) / 2,000 * 100 = 25.00 (%)


Example Problem #2

The variables needed for this problem are provided below:

cost of HVAC before insulation ($) = 6000

cost of HVAC after insulation ($) = 3000

cost of insulation ($) = 5000

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

ROINS = (CBI – CAI) / CI * 100 = (%)