How the Home Report accounts for changes in your energy use

If your energy usage has changed from last month, you’ll see a few of the main reasons why in your Home Report. Nest looks at a number of factors that can influence your energy usage, and uses them to determine the difference between each month.

Note: If you’ve only had your Google Nest thermostat for one month, or if your energy use hasn’t changed much, this section may not appear in your Home Report.

Reasons your energy usage might have changed

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As the weather changes, you naturally use more or less heating or cooling, even
if you don’t adjust your thermostat.

With the same schedule, a Nest thermostat might never turn on the heat in spring,
but it might turn on 12 hours a day to keep you warm during winter.

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Changes to your schedule may cause your energy usage to change compared to
the previous month. If your energy usage is higher or lower because of a change to
your schedule you might see this reason listed in your Home Report.

Note: Your schedule can change if you add or remove a setpoint, or if your Nest
thermostat automatically learns a new setpoint using Auto-Schedule.

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Manual adjustments

It’s considered a “manual adjustment” whenever you change the temperature using
your thermostat, or the Nest app. In the Home Report we compare the manual
adjustments you made last month to the ones you made this month.

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Eco Temperatures

If you change your thermostat to Eco Temperatures, it may cause your energy usage to
change from the previous month.

Tip: Choosing energy efficient Eco Temperatures can help you save energy.

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Home/Away Assist

Home/Away Assist can automatically use your Eco Temperatures when no one’s home
to help save energy.

Thermostat turned off


If your Nest thermostat is Off, it won’t heat or cool your home unless your 
Safety Temperatures are reached. If you’ve saved energy this month by turning
your thermostat off, you’ll see this reason in your Home Report.

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Added a Nest thermostat

If you add another Nest thermostat to your home, you’ll see twice the energy
information. This extra energy information might make it look like your energy usage
has gone up. We’ll show you this icon so you know that you haven’t necessarily used
more energy, we can simply see more of it.

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Calendar days

Every month doesn’t have the same number of days. Between January (31 days)
and February (28 days), you can heat your home for the same number of hours each
day, and you will still end up using less energy in February than January.


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