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Questions about Nest Learning Thermostat or Nest Protect: Smoke + CO alarm? We've got answers, videos, and plenty of resources to help you out.

Why does the temperature the Nest Learning Thermostat detects seem different than my old thermostat?

In some situations, the room temperature that the Nest Learning Thermostat displays may be different from another thermostat or thermometer. This is usually due to variations between different thermostats, the location of the other thermostat, or possibly your Nest Thermostat activity.

The Nest Learning Thermostat uses multiple temperature sensors to determine the ambient temperature with a high degree of accuracy. The Nest Thermostat's sensors are tuned to be most useful for keeping your home consistently comfortable. We found that responding rapidly to temperature changes gives your Nest Thermostat the most accurate data to work from.

Here are some factors that may contribute to differences between the Nest Thermostat's display temperature and that of another thermostat or thermometer. And it is good to remember that while the Nest Thermostat will heat consistently to its target temperature, changes in humidity mean that your body will perceive the same temperature differently.

Thermostats Vary

Not all thermostats are created equal. Different manufacturers use different sensors and different methods of calculating the ambient temperature. The thermostats can sometimes arrive at different ambient temperature measurements as a result.

The Nest Thermostat's sensors are designed to be highly accurate and react to changes in the ambient temperature more readily than most other thermostats. The most important thing to do is turn the temperature down when you’re too warm and up when you’re too cold and your Nest Thermostat will learn and keep you comfortable.

Room Placement

After replacing your old thermostat with a Nest Thermostat, your previous thermostat may display a different ambient temperature than your Nest. In many cases, this is because your previous thermostat is no longer installed on your wall. Surprisingly, the air temperature can vary dramatically between two areas of the same room that are separated by only a few feet.

To properly compare your old thermostat to the Nest Thermostat, hold your old thermostat up to the wall within a few inches to the right or left of the Nest Thermostat. It is important to make sure that both thermostats are the same height from the floor. Be sure to hold your old thermostat in a way that won’t cause its sensors to detect the warmth of your hand. After several minutes your old thermostat should adjust its detected temperature.

Automatic Calibration

After your Nest Thermostat is installed, is restarted, or performs an automatic software update, it will automatically calibrate its temperature.

During this period, the temperature shown on the Nest Thermostat display may differ slightly from the actual temperature in the room. Within approximately 10 minutes, the display temperature should be accurate.

Manual Thermostat Adjustments

When making many adjustments on your Nest Thermostat, the warmth of your hand may cause the Nest Thermostat's sensors to temporarily raise the ambient temperature displayed.

If you notice the temperature rising after adjusting your schedule or changing several settings, don’t worry; your Nest Thermostat continuously detects the ambient temperature and will readjust within a few minutes.