Google Nest Learning Thermostat (4th Gen) featuring an expansive borderless display, rotating stainless steel ring, included 2nd Gen Nest Temperature Sensor, and native Matter connectivity for Canadian homes.
Technical specifications
| Warranty | 2-year standard warranty for retail 5-year standard warranty for HVAC Pros For Quebec: Warranty of good working order: three years. Source: Google Nest warrantyWarranty is provided by the manufacturer under its own terms. See the source link for full details. |
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Key features
- Redesigned 2.68-inch circular 600×600 liquid crystal display with dynamic Glanceable UI
- Premium metallic finish with smooth rotating stainless steel outer control ring
- Includes one 2nd Gen Nest Temperature Sensor to prioritize comfort in key living spaces
- Advanced Soli radar occupancy detection wakes display smoothly upon approach
- Native Matter support delivers cross-platform compatibility across Apple Home, Google Home, Amazon Alexa, and Samsung SmartThings
- Smart Schedule automatically learns your temperature preferences and daily routines
- Urgent HVAC alerts notify you when system heating or cooling cycles fail to change home temperature
- Compatible with conventional heating and cooling (up to 3H/3C), heat pumps (up to 5H/3C), and 1-wire or 2-wire accessories (humidifiers, dehumidifiers, ERV/HRVs)
Varieties & finishes
The 4th Generation Google Nest Learning Thermostat is available in three precision-machined metallic finishes to complement interior home hardware:
- Polished Obsidian (GA05169-US): Deep black mirror-finish stainless steel ring with dark faceplate. Includes thermostat, 2nd Gen Temperature Sensor, base, trim plate, and steel mounting screws.
- Polished Silver (GA05220-US): Classic bright polished stainless steel ring. Includes thermostat, 2nd Gen Temperature Sensor, base, trim plate, and steel mounting screws.
- Polished Brass (GA05221-US): Rich warm gold brass finish. Includes thermostat, 2nd Gen Temperature Sensor, base, trim plate, and steel mounting screws.
Specifications
| Specification | Google Nest Learning Thermostat (4th Gen) |
|---|---|
| Available model numbers / SKUs | GA05169-US (Obsidian), GA05220-US (Silver), GA05221-US (Brass) |
| Product category | Learning Smart Thermostat with Remote Sensor |
| Display size & resolution | 2.68 in. (68 mm) diameter circular LCD (600 × 600 pixels at 324 ppi) |
| Dimensions (Thermostat) | Diameter: 98 mm (3.9 in.) × Depth: 29 mm (1.1 in.) |
| Weight (Thermostat) | 161.8 g (5.7 oz) |
| Dimensions (Nest Temp Sensor) | Diameter: 50 mm (1.9 in.) × Depth: 22.5 mm (0.9 in.) |
| Sensors | Soli radar motion sensor, temperature, humidity, ambient light |
| HVAC compatibility | Conventional (up to 3H/3C), Heat Pump (up to 5H/3C with AUX/E), Boilers |
| HVAC accessory terminals | AQ+ / AQ- terminals for 1-wire or 2-wire Humidifier, Dehumidifier, or Ventilator |
| Electrical power | 20–30 VAC (Power Sharing technology; C-wire or Nest Power Connector recommended) |
| Battery (Thermostat) | Built-in rechargeable lithium-ion battery |
| Battery (Sensor) | CR2 3V lithium battery (up to 3-year battery life) |
| Wireless connectivity | Wi-Fi 802.11 a/b/g/n (2.4 GHz & 5 GHz), Bluetooth Low Energy, 802.15.4 Thread (Matter) |
| Smart home protocol | Matter native; works with Google Home, Apple Home, Amazon Alexa, SmartThings |
| Operating temperature | 0°C to 40°C (32°F to 104°F) |
Before you buy
- Verify system compatibility: works with 24V forced-air, heat pump, boiler, and radiant systems. Not compatible with 120/240V high-voltage baseboard heaters.
- While Google Nest utilizes Power Sharing technology, installing a common C-wire or the Nest Power Connector is recommended for complex zoned or multi-stage systems.
- Requires a compatible smartphone, free Google Home app, and Wi-Fi internet connection for setup and remote access.
- Check wall opening: includes an optional colour-matched trim plate to cover existing paint flaws or old thermostat footprints.
Frequently asked questions
What is new in the Google Nest Learning Thermostat 4th Generation?
The 4th Generation features a 60% larger, high-resolution domed LCD display with Dynamic Farsight, a sleek stainless steel rotating ring, and Matter smart home protocol compatibility for seamless integration across Apple Home, Google Home, and Alexa.
What is the 2nd Gen Nest Temperature Sensor?
The included wireless Nest Temperature Sensor can be placed in any room up to 60 feet away to monitor hot or cold spots, allowing the thermostat to prioritize comfort in that specific room during scheduled hours.
Does the 4th Gen Nest require a C-wire?
The thermostat works in many homes without a C-wire using power sharing. However, for dual-fuel heat pump systems, variable-speed blowers, or complex zone valves, a dedicated 24 V C-wire or Nest Power Connector is recommended to ensure reliable operation.
How does the learning schedule feature function?
The thermostat uses machine learning to learn your household temperature preferences and daily schedules over time, automatically creating an energy-saving schedule and activating Eco temperatures when you leave home.
What HVAC systems does the 4th Gen Nest support?
It supports up to 3 stages of heating and 2 stages of cooling for conventional systems, up to 2 stages of cooling and 2 stages of heat pump with auxiliary heat, as well as humidifiers, dehumidifiers, and dual-fuel configurations.
What is Dynamic Farsight?
Dynamic Farsight uses radar motion sensing to detect your presence from across the room, illuminating the domed display to show local weather, indoor temperature, humidity, or a classic analog clock face.
How does it protect HVAC equipment during extreme weather?
The thermostat monitors system run times and indoor humidity levels, alerting homeowners if heating equipment fails to reach temperature or if filter replacement intervals are reached.
Does the thermostat support Matter protocol?
Yes. The 4th Gen Nest is certified on the Matter standard over Thread, enabling direct local communication with Apple Home, Samsung SmartThings, and third-party smart home controllers without cloud lag.
Can the thermostat control a whole-home humidifier?
Yes. The wiring base features dedicated * (star) accessory terminals capable of controlling 24 V evaporative or steam humidifiers with outdoor temperature compensation.
What finishes are available for the metal ring?
The rotating control ring is crafted from polished stainless steel and is available in Polished Silver, Polished Brass, and Polished Obsidian to match interior décor.
Documents
- Google Nest Learning Thermostat 4th Gen pro installation and configuration guide (PDF)
- Nest Learning Thermostat 4th Gen technical wiring diagrams and field installation manual (PDF)
Technical specifications sourced from manufacturer documentation published by Google LLC.
Installation & Safety Notice: Low-voltage thermostat installation requires turning off power to your heating and cooling system at the breaker before wiring. Follow Google Nest wiring specifications or consult a licensed HVAC technician.
Common questions
Is installation included?
No. AVL Shop sells equipment only. Installation is done by an independent licensed contractor that you hire.
How is freight charged?
Freight cost is included in your written quote before you pay.
What warranty does this product have?
The manufacturer warranty applies. Where we have the manufacturer’s exact wording, it is shown in the Warranty row of the specifications on this page, with a link to the source.
How do I get a quote?
Use Request a quote on this page and send the model and your city or postal code.