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Savings due to roof insulation.
According to the epa you can expect net annual savings of just under 50 cents per square foot of roof.
In order to get a reasonable answer one must do some testing and compare to the energy used by the house with local weather.
Insulation savings calculator use this insulation savings calculator to measure the financial impact of increasing your insulation performance.
Net savings ft per year cooling savings ft per year heating savings heating penalty if negative ft per year insulation in black roof to yield same annual energy savings.
For a system that generally costs between 2 3 per square foot you can see that it won t take long to recoup your costs through energy savings.
Knowing the cost of energy and the cost of the insulation upgrade you can calculate the rate of return on your investment in insulation.
Knowing the r values before and after an insulation upgrade and the average temperature difference across the insulation you can calculate the amount that the insulation upgrade reduces heat flow.
After that you will have a good picture of what your house lost in energy through the year.
The savings and payback vary substantially depending on the existing level of insulation but are typically between 5 20 years.
It is not easy to calculate.
Upgrade from r to r h ft f btu details of comparison.