Important: The side that the wires come out of the connectors doesn’t matter. In the picture above, you might assume that this thermostat is connected to a conventional system because the wires are coming out of the conventional side of the connectors. In fact, this thermostat is actually connected to a Heat Pump system. Use wire color as a guide Your thermostat will need time to learn about you and your home before it creates your schedule and activates its energy saving features. If one or more wires in your current thermostat doesn’t have a label, don’t guess. You’ll need to know what wires are connected to your current thermostat before you can install your Nest thermostat.

Nest thermostat - Google Nest Help Install your Nest thermostat - Google Nest Help

Wires labeled L can be indicator lights. The Nest thermostat uses its LCD display instead of an indicator light.Note: If your system can’t provide enough consistent power to your Nest thermostat, you may need to connect a C wire or the Nest Power Connector to fix power-related issues. After you reset the account connection, you'll still find your thermostat in the app. However, your thermostat will be listed as "offline" and you'll no longer be able to control it with the app. To remove it from your account and app, you'll need to go to your thermostat's settings. Some systems have control panels or equipment interface modules that require a C wire to be compatible with Nest thermostats. Below isa list of some known panels that require a C wire. This list is not meant to be comprehensive, so your system may be incompatible even if it isn’t listed here.

Nest thermostat compatibility - Google Nest Help Nest thermostat compatibility - Google Nest Help

The Nest Thermostat E is only compatible with one stage of heating, one stage of cooling, and an additional stage of either heating or cooling. Simply enter which connectors have a wire and ignore the color of the wires. This is because not all systems are connected to the thermostat with the same wire colors. The app will give you a custom wiring diagram to help you install the Nest thermostat. Refer to the following article for step-by-step installation instructions. Systemsthat use coal, wood chips, pellets, anthracite, or other biomass materials are typically incompatible with Nest thermostats.Tip:Common wires are typically blue, but you should not rely on color alone to determine the function of a wire. Have the previous owner remove the thermostatfrom their account if possible. If this isn’t possible, reset the thermostat to factory defaults. Proprietary systems are designed by the manufacturer so that they can’t work with other thermostats. There are a few ways to save energy with your thermostat like setting an Eco Temperature when no one’s home, reviewing your Home Report to monitor your energy use, or joining an energy saving program. In heat pump systems, the Y2 wire controls the second stage of your compressor, which can help heat or cool your home faster.