How Nest calculates greenhouse gas reduction in the Home Report

In addition to your energy savings, you may see a reference to greenhouse gas reductions in your Nest Home Report. Here’s how we calculate these numbers.


The amount of greenhouse gas emitted per
kilowatt-hour depends on the fuel type used by
your system and can be measured in metric tons
of carbon dioxide equivalent emissions. We made
several assumptions relating to fuel sources and
region-specific emissions in our calculations:

  • For heatings savings, we converted natural
    gas therms to their CO2 equivalents based on
    a standard conversion factor (source)


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  • For AC savings, we calculated CO2 offset equivalents using US and Canada regional registry coefficients for electricity production (EPA and Environment Canada)

Once we arrived at metric tons of CO2, we applied a US EPA statistic approximating 1.22 metric tons of CO2 sequestered annually by one acre of average US forest (source).

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