Smart thermostats / Comparison

See what changes

Choose up to five exact US purchase options. Compare documented differences and open each source for its conditions.

Option 1

Option 2

Add up to three more options

Option 3

Option 4

Option 5

Show differences onlyReset selection

1 of 5 options selected. Bookmark this address to keep your selection.

Wi-Fi connected 24 V low-voltage thermostats sold new in the US. Line-voltage thermostats, pro-only equipment interface modules, utility-program packages and measured energy savings are outside this catalogue.

Scroll sideways to see every option. Open a field explanation or source for its conditions.

Documented specifications and exact purchase packages
Compare the details	X2S Smart Thermostat RTH2CWF/U, white (Honeywell Home, US)
Community reviews	No community reviews yet. Purchase packages of the same model share one community score. Read all reviews Write a review
US purchase package	X2S Smart Thermostat, SKU RTH2CWF/U, white, single thermostat sold on honeywellhome.com in the US. Product & sources The page does not list box contents. A FREE C-Wire Adapter online offer is mentioned as not shipping to Canada; whether this purchase includes an adapter was not established. The page showed Unavailable and a backorder notice; price and availability were not verified. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Where to buy	Select: X2S Smart Thermostat, SKU RTH2CWF/U, white, single thermostat sold on honeywellhome.com in the US. View at Honeywell Home (Resideo) — X2S Smart Thermostat RTH2CWF/U, white (Honeywell Home, US); opens in a new tab The link may open several packages. Check current price and availability with the seller. Opens in a new tab.
Documented HVAC support The manufacturer's published supported-system and stage statement, kept close to its wording. This is a published compatibility list, not an installation guarantee. Use the manufacturer's compatibility checker and your actual wiring before buying.	Up to 2 heat/2 cool conventional, up to 2 heat/1 cool heat pump with electric backup, hot water heat, forced air (gas, oil, or electric); does not work with electric baseboard heat (120-240V). Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Heat pump stages Published heat pump compressor and auxiliary or emergency heat stage support. Heat pump staging differs from conventional staging. Dual-fuel and balance-point behavior must be confirmed separately for your equipment.	Up to 2 Heat/1 Cool heat pumps with electric backup; Emergency Heat mode and a heat pump failure alert are listed. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Accessory terminal support Documented humidifier, dehumidifier or ventilator accessory control and any terminal limits. One shared accessory terminal is not the same as independent control of several accessories. Some accessories need an isolation relay.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. No humidifier, dehumidifier or ventilator control is stated on the manufacturer page. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
C-wire requirement The manufacturer's statement about needing a common (C) wire and how the thermostat is powered without one. A design that works without a C wire in most homes can still require one for particular systems. Treat percentages as manufacturer statements.	C-wire required (24 VAC). Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Power adapter or extender in this package Whether the selected US package ships with a C-wire adapter, power extender kit or power connector. An accessory sold separately or promoted free in one channel is not box content. Check the exact package before ordering.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Box contents are not listed; the C-Wire Adapter offer wording does not establish inclusion. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Remote sensors in this package Count of wireless room or temperature sensors supplied in the selected US package. Zero included does not establish that sensors are unsupported; some thermostats do not support any remote sensor at all.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Box contents are not listed and no room sensor support is documented. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Wireless connectivity Documented Wi-Fi bands and other radios in the thermostat. A 2.4 GHz-only radio needs that band enabled on your router. A listed radio does not by itself establish Thread or Matter support.	WiFi 2.4 or 5GHz (802.11 b/g/n). Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Matter certified Whether the manufacturer documents Matter certification or Matter control. Matter control may still require the maker's app for setup. Matter is not the same as a native Alexa, Google or HomeKit integration.	YesFootnoted as Matter Certified with a Matter supplement for the QR code. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Thread radio documented Whether the manufacturer explicitly documents Thread support. An 802.15.4 or sub-GHz radio listing is not a Thread claim. Unknown means no explicit statement was found.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Thread is not mentioned. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Apple HomeKit or Apple Home named Whether the manufacturer names Apple HomeKit or Apple Home as a supported platform. Matter-only compatibility with Apple Home is not recorded as HomeKit support unless the manufacturer names Apple.	YesApple Home/HomeKit, Amazon Alexa and Google Assistant are named. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Display and control Documented screen type, size or resolution and the primary local control method. Screen size does not rank usability. Some thermostats are controlled by a side touch strip or ring rather than a touchscreen.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. The page says a large screen; display technology and control type are not stated. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Built-in humidity sensor Whether the thermostat itself documents a humidity sensor. Sensing humidity is separate from controlling a humidifier or dehumidifier, which depends on accessory support and wiring.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Humidity sensing or display is not stated. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Built-in air quality monitoring Whether the manufacturer documents an indoor air quality sensor in the thermostat. Air quality monitoring names a feature, not a measured accuracy. The sensed parameters may not be published.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Air quality monitoring is not mentioned. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Built-in occupancy or motion sensor Whether the thermostat documents a built-in occupancy, motion or radar sensor. Geofencing through a phone and remote sensors are different mechanisms from a sensor in the thermostat.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Auto-away functionality is named without stating the sensing mechanism. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
App, account and subscriptions The documented app required for setup and any optional or required subscriptions. Core heating and cooling control normally works without a paid plan; security or filter services are separate subscriptions.	Resideo Connect app, listed in the app stores as First Alert by Resideo. Account requirements are not stated. Source · 2026-10-21 Honeywell Home (Resideo): X2S Smart Thermostat RTH2CWF/U product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Questions to check before buying	A published compatibility list is a manufacturer statement, not a tested installation guarantee; the manufacturer compatibility checker and the actual wiring decide. The manufacturer page showed Unavailable and a backorder notice when checked; availability was not verified. Box contents, display technology and humidity sensing are not published on the page.

See what changes

Optional Google Analytics