Smart Thermostats / Honeywell Home
Honeywell Home X2S (RTH2CWF)
The cheapest Matter thermostat here, if you have a C wire and forgive its thin Matter.
Overall score 5.1/10
Pros
- + Matter certified, ENERGY STAR certified and dual-band Wi-Fi for $79.99 — nothing else here does all three that cheaply
- + 2H/2C conventional staging is more than the similarly priced Sensi Lite or the Nest Thermostat publish
- + Mounts on Resideo's UWP plate, the same system professional installers use, which makes wiring tidy
- + 2-year warranty at $80, double what Amazon and Google give at this price
Cons
- − A C wire is mandatory and no adapter is included — in a four-wire house this $80 thermostat becomes an electrician's callout
- − Matter works only for reading state in at least one reviewer's testing: setpoint changes sent over Matter did not stick
- − You have to install the First Alert app to get a Matter pairing code, so Matter does not free you from the vendor app
- − No room sensors and no occupancy sensing at all — this is strictly a one-room thermostat
- − No humidifier, dehumidifier or ventilator control
Honeywell Home X2S (RTH2CWF) review: what the specs say
The cheapest Matter thermostat here, if you have a C wire and forgive its thin Matter. At $79.99, Honeywell Home's 2025 model sits among the cheapest we cover — the smart Thermostats we compare run from $79 to $259.99. It scores 5.1/10 overall, calculated from published specifications across 8 categories rather than from a subjective impression.
Its strongest showing is Value at 8.5/10 — what the money buys once accessories, adapters and sensors are added in. The weakest is Multi-Room Sensing at 1.0/10, which is the trade-off to weigh before buying: if that is the specification you care about most, one of the alternatives below will serve you better.
Worth knowing before you buy: a C wire is mandatory and no adapter is included — in a four-wire house this $80 thermostat becomes an electrician's callout; and matter works only for reading state in at least one reviewer's testing: setpoint changes sent over Matter did not stick. Every specification on this page comes from Honeywell Home's own documentation or a verified retail listing — where a figure is not published, the table says so rather than estimating it.
Specifications and price last verified . Report an error
Full Specifications
| System Voltage | Low voltage 24V. Resideo states it does not work with electric baseboard heat at 120-240V |
| C-Wire Required | Yes, hard requirement. Resideo states a constant 24V C-wire supply is needed and the X2S is not battery powered |
| Adapter / Power Kit Included | No adapter of any kind is included |
| Heating & Cooling Stages | Up to 2 Heat/2 Cool conventional |
| Heat Pump & Aux Heat | Yes — up to 2 Heat/1 Cool heat pump with electric backup |
| Humidifier / Ventilator Terminals | None published. Humidity is monitored and displayed, not controlled |
| Remote Sensors | None. There is no room sensor option for this model |
| Occupancy Detection | None. Away behaviour comes from geofencing in the First Alert app |
| Matter Support | Matter certified — but Matter Alpha's reviewer could see temperature, humidity and mode in SmartThings and could not get setpoint changes to take effect, which breaks the automations Matter is meant to enable |
| Voice & Smart Home Platforms | First Alert app by Resideo (required for setup and to generate the Matter code), Amazon Alexa, Google Assistant, Apple Home via Matter |
| Utility Rebates & Demand Response | ENERGY STAR certified. Resideo's launch materials specifically call out enabling enrolment in utility energy-management programs |
| Account or Subscription Needed | No subscription. A First Alert account is required |
| Connectivity | 2.4GHz Wi-Fi, 5GHz Wi-Fi, Matter |
| Material | Plastic housing with a 4.84 sq in monochrome display and a UWP wall plate |
| Warranty | 24 months |
Compare Honeywell Home X2S (RTH2CWF) With
Cheaper Alternative
Sensi Lite (ST25) — $79.00
Premium Alternative
Google Nest Thermostat (2020) — $129.99