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Improved compatibility.
It works with most 24V systems, including gas, electric, oil, forced air, heat pump, and radiant, and no C wire is required for installation in most homes.³
Better visibility into adjustments.
Smart Schedule learns the temps you like, and when you like them. It asks for permission to make schedule changes to help you save energy. You'll receive notifications in the Google Home app, and you can view and accept changes with a tap.¹
Beautiful design.
With a 60% larger display⁴ and Dynamic Farsight, you can see info from across the room.¹ Choose the design – a clock, the temp, weather, and more. It automatically adjusts brightness for the best readability or you can adjust manually.
Easy control in the Google Home app.
Adjust the temperature on your phone from anywhere¹ or by using your voice.⁵ It's easy to install yourself³ and it's Matter compatible for simple integration into your smart home.⁶
Manage hot and cold spots.
The Nest Learning Thermostat (4th gen) comes with a Nest Temperature Sensor (2nd gen) and works with any Nest Temperature Sensor. Put a sensor in any room and use the Google Home app to set the temp it should reach at a certain time of day.
Savings you can count on.
The Nest Learning Thermostat (4th gen) can help save an average of 12% on heating bills and 15% on cooling bills.⁷
New natural heating and cooling.
Your thermostat learns how the temperature outside affects the temperature inside (for example, when the sun coming through the windows will heat the house naturally) and pauses your system to help you save.¹
New Adaptive Eco.
It uses the temperature outside to help find an energy-saving temperature when you're away and returns to a comfortable temperature within an hour of your return.¹
Looks out for your heating and cooling system.
System Health Monitor helps catch many issues early. And if something needs attention, it can send an alert.⁸
Your HVAC heads-up.
When it's time to change your air filter, you'll get an alert based on actual use.⁸ And you'll get seasonal maintenance reminders.
Smart is in the air.
To save energy, smart ventilation brings in fresh air when outdoor air quality is healthy and most efficient, like when temps are mildest.¹,⁹
Clean energy made simple.
Energy Shift from Nest Renew can automatically shift your energy use to cleaner or cheaper times.¹⁰
Brand
Model Number
GA05551-US
Product Name
Nest Learning Thermostat (4th gen) with Nest Temperature Sensor (2nd gen)
Color
Polished Silver
Product Height
1.14 inches
Product Width
3.85 inches
Product Depth
3.85 inches
Product Weight
0.35 pounds
Wire Configuration
C-wire
3-Wire
Wire Terminals
W (heating)
W2 (heating stage 2)
Y (cooling)
Y2 (cooling stage 2)
Aux (auxiliary)
Power Source
Hard wired
Battery-powered
Rechargeable Battery
Yes
Battery Chemistry
Lithium
Voltage Type
Low voltage
App Compatible
Yes
Compatible Product(s)
Heat pumps
Air conditioners
Radiators
Furnaces
Hot water systems
Compatible with 24V Cooling
Yes
Compatible with 24V Heating
Yes
Wireless Connectivity
Wi-Fi
Bluetooth
Frequency Band
2.4 GHz
5.0 GHz
Operating System Compatibility
Android
Apple iOS
Mac
Windows
Works With
Google Home
Amazon Alexa
Apple Home
Voice Assistant Built-in
No
Programmable Period
Learning
24-Hour Programming
Yes
Touch Screen
No
Multi-Zone Control
Yes
Auto-Away Mode
Yes
Backlit
Yes
Date/Time Display
Yes
Remote Sensor Capable
Yes
Number of Remote Sensors Included
1
Outdoor Weather Sensor
Yes
Motion Sensing
Yes
Detector Type
Temperature
Air quality
Humidity
Energy Usage and History
Yes
Furnace Filter Change Indicator
No
Keypad Lock
No
ENERGY STAR Certified
Yes
Warranty - Parts
2 years
Warranty - Labor
2 years
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