The Diminishing Returns of More Insulation

A bar graph overlapped with a line graph showing the diminishing returns of more insulation

The bar graph shows the reduction of heat flow compared to R-2, while the line graph shows the heat flow. The heat flow is removed dramatically between R-2 and R-4, and by half that amount again between R-4 and R-6. The amount of heat flow reduction lessens and lessens, eventually reaching a plateau.

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