Learn more about jumper wires

Unlike most thermostats, the Google Nest Learning Thermostat does not require a jumper wire
between Rh and Rc. Nest knows that if you’ve got heating and cooling, and just one R wire,
the power source is shared between them.

Most of the wires connected to your thermostat
should have one end connected to your
thermostat and the other end should go through
your wall to connect to your HVAC system.

If your old thermostat had a wire between two
connectors like Rh and Rc (a wire that does not
go into the wall), do not connect this wire to your Nest Thermostat.

nest thermostat generation 3

Nest Thermostat connectors are built so that only one wire can be inserted per connector.
Inserting more than one wire into a Nest base connector can damage your HVAC equipment
and your thermostat.

Learn more about Jumper wires

Instead of using jumper wires, Nest Thermostats have an automatic internal jumper between
the Rh and Rc connectors. Nest will automatically activate this internal jumper if your
system needs it.

Jumper wire image

For example, if both an Rh and an RC wire are connected, your thermostat will not jumper
these connectors together. But if the system has both heating and cooling and only one R
wire, Nest will automatically jumper Rh and Rc.

Installation

Your single R wire can go into either Rc or Rh on Nest.

          Learn more about other wire labels >

Make sure to take a picture of your old thermostat’s wiring during installation. Keep your old
thermostat, the photo of your wiring, and any jumper wires your old thermostat uses in a
safe place.

That way if you ever decide to move and you want to take your Nest Thermostat with you,
you’ll have everything you need to reinstall your old thermostat.

Important: If you have separate heating and air conditioning systems, you might have
separate Rh and Rc wires that come from the wall. These are not jumper wires, and you can
insert the Rc wire into the Rc connector and the Rh wire into the Rh connector.

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