DevicesClimate
Same-category comparison
ecobee Smart Thermostat Premiumvs Resideo Honeywell Home T9
Both are climate. Rows that do not match are marked Differs. The feature paragraphs under each name are AI-generated.
ecobee
Smart Thermostat Premium
ecobee listed $259.99 on its product page on 13 Oct 2026.
Pros
- • A room sensor and a Power Extender Kit are in the box.
- • HomeKit, Alexa, and SmartThings are on the spec line, and Alexa and Siri are built in.
- • Occupancy radar is on the sensor list, not just a marketing adjective.
Cons
- • Matter is not on the spec list this row uses. Do not buy it on that assumption.
- • It is a 24V thermostat. It is the wrong product for line-voltage electric heat.
- • Security-hub features grow a subscription and more sensors.
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.
Hardware
| Spec | ecobee Smart Thermostat Premium | Resideo Honeywell Home T9 |
|---|---|---|
| DisplayDiffers | 4 in full-color LCD, 540 × 540. Black front, zinc-alloy frame. | — |
| SizeDiffers | 103.89 × 103.89 × 25.9 mm (4.09 × 4.09 × 1.02 in) | — |
| Sensors on the statDiffers | Temperature, humidity, occupancy radar, proximity radar | — |
| Air qualityDiffers | The product page says built-in air-quality monitoring. The sensor list above is what the spec sheet names. | — |
| RadiosDiffers | Dual-band Wi-Fi (2.4 GHz 802.11 b/g/n, 5 GHz 802.11 a/n/ac), Bluetooth 5.0, 915 MHz for sensors | — |
| PowerDiffers | 24VAC on C and Rc, up to 3.5 VA. Power Extender Kit included for many homes without a C wire. No batteries. | — |
| HVACDiffers | Most 24V systems: conventional 2H/2C, heat pump 2H/2C plus two auxiliary stages, boilers, PTACs up to 3 fan speeds. One 1-wire or 2-wire accessory. | — |
| 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. |
Software
| Spec | ecobee Smart Thermostat Premium | Resideo Honeywell Home T9 |
|---|---|---|
| VoiceDiffers | Alexa built in and Siri, per the product page | Alexa and Google Assistant on the widely sold Wi-Fi T9 |
| Works with (spec line)Differs | Apple HomeKit, Amazon Alexa, Samsung SmartThings, IFTTT | — |
| Also named on the pageDiffers | Google Assistant appears in the ecosystem list above the spec table | — |
| MatterDiffers | Not named on the specification list used for this row. Confirm current certification if Matter is a requirement. | 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. |
| DataDiffers | About 15–20 MB per month, depending on Alexa use | — |
| AppDiffers | — | Honeywell Home / Resideo app |
| Apple HomeDiffers | — | HomeKit is not part of the classic T9 |
What you buy with it
| Spec | ecobee Smart Thermostat Premium | Resideo Honeywell Home T9 |
|---|---|---|
| In the boxDiffers | Thermostat, mounting plate, SmartSensor and stand, trim plate, Power Extender Kit, wire labels, screws | — |
| WarrantyDiffers | 3-year limited warranty | — |
| Security extrasDiffers | Door sensors and the Smart Security subscription are separate. The included SmartSensor is the room sensor. | — |
| 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. |