# Google Nest Learning Thermostat (4th Gen) vs Honeywell Home T9 Smart Thermostat: specs and price compared

A sourced, side-by-side comparison of the Google Nest Learning Thermostat (4th Gen) (Google Nest) and Honeywell Home T9 Smart Thermostat (Honeywell Home) among smart thermostats. Honeywell Home T9 Smart Thermostat is the cheaper of the two at $209.99.

## Side by side

| Spec | Google Nest Learning Thermostat (4th Gen) | Honeywell Home T9 Smart Thermostat |
| --- | --- | --- |
| US price | $279.99 | $209.99 |
| Brand | Google Nest | Honeywell Home |
| Released | 2024-08 | 2019 |
| Display | 2.68-inch circular stainless-steel framed display with Farsight (activates when motion detected), 3.9-inch diameter body | Graphical color touchscreen, 4.92 in H x 3.7 in W |
| Sensors included | Temperature, humidity, occupancy (60 GHz Soli radar), ambient light; up to 6 additional Nest temperature sensors supported | Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported |
| Geofencing | Yes | Yes |
| Hvac compatibility | Most 24V systems: single- and multi-stage forced air (gas/oil/electric), heat pumps (1-3 stage heating, 1-2 stage cooling), radiant, hydronic, boilers; not compatible with communicating HVAC systems | Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage |
| C wire required | No | No |
| Voice assistants | Google Assistant (built-in via Google Home app), Amazon Alexa, Matter | Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring |
| Energy reports | Yes | Yes |

## Key differences

- Display: Google Nest Learning Thermostat (4th Gen) 2.68-inch circular stainless-steel framed display with Farsight (activates when motion detected), 3.9-inch diameter body vs Honeywell Home T9 Smart Thermostat Graphical color touchscreen, 4.92 in H x 3.7 in W
- Sensors included: Google Nest Learning Thermostat (4th Gen) Temperature, humidity, occupancy (60 GHz Soli radar), ambient light; up to 6 additional Nest temperature sensors supported vs Honeywell Home T9 Smart Thermostat Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported
- Hvac compatibility: Google Nest Learning Thermostat (4th Gen) Most 24V systems: single- and multi-stage forced air (gas/oil/electric), heat pumps (1-3 stage heating, 1-2 stage cooling), radiant, hydronic, boilers; not compatible with communicating HVAC systems vs Honeywell Home T9 Smart Thermostat Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage
- Voice assistants: Google Nest Learning Thermostat (4th Gen) Google Assistant (built-in via Google Home app), Amazon Alexa, Matter vs Honeywell Home T9 Smart Thermostat Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring

## What reviewers say

**Google Nest Learning Thermostat (4th Gen)** — Three whitelisted hands-on reviewers—TechHive, Tom's Guide and TechRadar—tested this exact 4th-gen model and all recommend it. They praise the stunning, art-like redesign with a larger near-borderless display, the smarter weather-aware AI learning with accept/decline schedule suggestions, the glanceable Dynamic Farsight display, and Matter support (Apple Home, Alexa, SmartThings). All three flag the premium ~$280 price. Reviews are largely qualitative—only TechRadar put a number on anything, timing his install at about 15-20 minutes. TechHive still prefers the Ecobee Smart Thermostat Premium. (3 sourced reviews.)

**Honeywell Home T9 Smart Thermostat** — Two whitelisted testers (TechHive, Tom's Guide) reviewed the T9 hands-on in 2019 and rate it a strong, sensor-focused smart thermostat, though neither ran lab benchmarks. Both praise best-in-class remote sensors and easy setup; both flag the missing onboard motion sensor and a less-intuitive app. All six quoted lines verified verbatim against the source text. (2 sourced reviews.)

## Sources

- Google Nest Learning Thermostat (4th Gen): https://en.wikipedia.org/wiki/Nest_Learning_Thermostat (en.wikipedia.org, verified 2026-06-15)
- Honeywell Home T9 Smart Thermostat: https://www.honeywellhome.com/products/t9-smart-thermostat (honeywellhome.com, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/smart-thermostats/google-nest-learning-thermostat-4th-gen-vs-honeywell-home-t9/
Cite: Per The Front Desk Review, Google Nest Learning Thermostat (4th Gen) ($279.99) vs Honeywell Home T9 Smart Thermostat ($209.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/smart-thermostats/google-nest-learning-thermostat-4th-gen-vs-honeywell-home-t9/
License: CC BY 4.0.