DevicesClimate
Same-category comparison
Resideo Honeywell Home T9vs Google Nest Learning Thermostat (4th gen)
Both are climate. Rows that do not match are marked Differs. The feature paragraphs under each name are AI-generated.
Resideo
Honeywell Home T9
Device Radar’s 2026 comparison listed about $179–$219 depending on the sensor kit. Confirm the current kit.
Pros
- • Usually the least expensive of the three thermostats in this catalog, before sensor kits.
- • Alexa and Google Assistant cover the common voice cases.
- • Room sensors can be added without buying a different brand of stat.
Cons
- • No HomeKit on the classic model.
- • Matter is not something this row can confirm. Read the model number.
- • Fewer included parts than the ecobee, which ships a sensor and a power extender.
Nest Learning Thermostat (4th gen)
Google Store listed $279.99 on 13 Oct 2026, or financing on that page.
Pros
- • Matter is on Google’s own spec page, not a rumor.
- • A temperature sensor is included, and most installs do not need a new C wire.
- • Three heat and three cool stages cover more equipment than a basic stat.
Cons
- • Setup requires the Google Home app and a Google Account.
- • No air-quality sensor on the spec list.
- • Accessory wiring is fussy: one connector is shared among W3, Y3, G3, E, HUM, and DEHUM.
Hardware
| Spec | Resideo Honeywell Home T9 | Google Nest Learning Thermostat (4th gen) |
|---|---|---|
| TypeDiffers | 24V Wi-Fi thermostat. Color touchscreen. This row is the classic T9, not a guessed 2026 revision. | — |
| Room sensorsDiffers | Wireless sensors exist as kits and add-ons. Confirm whether the box includes one. | — |
| C-wireDiffers | Plan on a C wire unless the specific listing says otherwise. Do not assume a power-extender kit is included. | — |
| SizeDiffers | — | 3.9 in diameter, 1.1 in deep, 5.7 oz |
| DisplayDiffers | — | 2.7 in circular LCD, 600 × 600 |
| SensorsDiffers | — | Soli motion, temperature, humidity, ambient light. No air-quality sensor is listed. |
| RadiosDiffers | — | Wi-Fi 802.11n, 2.4 and 5 GHz |
| PowerDiffers | — | From HVAC wiring, with a built-in rechargeable battery. Designed to work without a C wire; Google says under 1% of homes need a C wire or the Nest Power Connector. |
| HVACDiffers | — | Most 24V systems, including up to 3 heat and 3 cool stages and heat pumps with auxiliary heat. Some accessory wires share one connector — read the wiring note before you buy for a humidifier. |
Software
| Spec | Resideo Honeywell Home T9 | Google Nest Learning Thermostat (4th gen) |
|---|---|---|
| AppDiffers | Honeywell Home / Resideo app | Google Home app is required for installation |
| VoiceDiffers | Alexa and Google Assistant on the widely sold Wi-Fi T9 | — |
| Apple HomeDiffers | HomeKit is not part of the classic T9 | — |
| MatterDiffers | Not a feature of the classic T9. Device Radar’s comparison mentions a Matter-marked SKU — match the model number. This row will not invent that spec. | — |
| EcosystemsDiffers | — | Works with Google Home and Matter, including other Matter apps and voice assistants |
| EnergyDiffers | — | Under 1 kWh per month. ENERGY STAR. |
What you buy with it
| Spec | Resideo Honeywell Home T9 | Google Nest Learning Thermostat (4th gen) |
|---|---|---|
| What to verifyDiffers | Sensor included or not, C-wire requirement, and whether the listing is the Matter model or the older Wi-Fi model. | — |
| Who it fitsDiffers | A contractor-familiar thermostat when HomeKit and a built-in speaker are not the brief. | — |
| In the boxDiffers | — | Display, base, trim plate, steel plate, screws, labels, and a Nest Temperature Sensor (2nd gen) |
| WarrantyDiffers | — | 2 years retail, 5 years for HVAC pros |
| ColorsDiffers | — | Polished Silver, Polished Obsidian, Polished Gold |