Operation Manual

ContentsCompatibility
Based on Nest’s online compatibility checker data, the Nest
Thermostat works with most 24V systems, including gas,
electric, oil, forced air, variable speed, heat pump and radiant.
It can control:
• Heating: one, two and three stages (W1, W2, W3)
• Cooling: one and two stages (Y1, Y2)
• Heat pump: with auxiliary and emergency heat (O/B, AUX, E)
• Fan (G)
• Power (C, Rh, Rc)
• Humidifier or dehumidifier (HUM, DEHUM)
The Nest Thermostat’s * connector can accept only one
of these wires: W3, E, HUM or DEHUM.
The Nest Thermostat is designed to work even if your home
doesn’t have a common C wire. Rarely, installing a new C wire
may be required.
Professional installation recommended for:
• Dual fuel systems (heat pump with furnace)
• Whole-home humidifiers and dehumidifiers
Go to nest.com/works to make sure the Nest Thermostat will work
in your home and find out if you need professional installation.
Watch the video
Before you start, watch our installation video
at nest.com/support
Display
Optional steel
plate screws
Screwdriver
Optional trim plate
Base
Optional steel plate
Wall screws