Smart Thermostats / Honeywell Home X2S (RTH2CWF) vs Honeywell Home X8S (X8VMC8B/U)
Honeywell Home X2S (RTH2CWF) vs Honeywell Home X8S (X8VMC8B/U)
Honeywell Home X8S (X8VMC8B/U)
Biggest screen and 20 room sensors, over a deliberately minimal Matter layer.
Wins overall by 2.2 points
Quick Verdict
The Honeywell Home X8S (X8VMC8B/U) takes this by a clear 2.2 points. Biggest screen and 20 room sensors, over a deliberately minimal Matter layer. The Honeywell Home X2S (RTH2CWF) only makes sense if it wins on a category you care about more than the total.
The Honeywell Home X2S (RTH2CWF) and Honeywell Home X8S (X8VMC8B/U) are both current-generation smart Thermostat models, and the Honeywell Home X2S (RTH2CWF) is $140 cheaper than the Honeywell Home X8S (X8VMC8B/U) ($79.99 vs $219.99). On Multi-Room Sensing, the Honeywell Home X8S (X8VMC8B/U) leads (9.0 vs 1.0/10) — remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature. On Display & On-Device Control, the Honeywell Home X8S (X8VMC8B/U) leads (9.5 vs 5.0/10) — screen quality and how much you can do at the wall instead of in the phone app. On C-Wire Freedom, the Honeywell Home X8S (X8VMC8B/U) leads (4.5 vs 1.0/10) — how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category.. Overall, the Honeywell Home X8S (X8VMC8B/U) scores 7.3/10 across our 8 scoring categories versus 5.1/10 for the Honeywell Home X2S (RTH2CWF). Below, we break down the full spec sheet, category-by-category scores, and exactly who should buy which one.
Side-by-Side Comparison
| Spec | Honeywell Home X2S (RTH2CWF) | Honeywell Home X8S (X8VMC8B/U) |
|---|---|---|
| Price | $79.99 | $219.99 |
| Release Year | 2025 | 2025 |
| System Voltage | Low voltage 24V. Resideo states it does not work with electric baseboard heat at 120-240V | Low voltage 24V. Home Depot's listing states plainly that it does not work with 120-240V electric baseboard heat |
| C-Wire Required | Yes, hard requirement. Resideo states a constant 24V C-wire supply is needed and the X2S is not battery powered | Yes — Resideo states the X8S needs a constant 24V supply through a common wire |
| Adapter / Power Kit Included | No adapter of any kind is included | Not in the box, but Home Depot's listing says the package contains a voucher for a free mail-in Honeywell Home C-Wire Adapter |
| Heating & Cooling Stages | Up to 2 Heat/2 Cool conventional | Sources conflict: Resideo's own product page says up to 4 Heat/2 Cool on heat pumps or 3 Heat/4 Cool conventional, while Home Depot's listing for the same product says up to 3 Heat/2 Cool heat pump or 2 Heat/2 Cool conventional |
| Heat Pump & Aux Heat | Yes — up to 2 Heat/1 Cool heat pump with electric backup | Yes, heat pump with electric backup |
| Humidifier / Ventilator Terminals | None published. Humidity is monitored and displayed, not controlled | Resideo advertises 'advanced indoor air quality control' but notes additional HVAC equipment may be required, and publishes no plain humidifier/dehumidifier/ventilator terminal list |
| Remote Sensors | None. There is no room sensor option for this model | One wireless room sensor is included with the X8VMC9W and X8VWF10B SKUs only — not with this one. Up to 20 sensors per home, 200ft range, $44.99 each |
| Occupancy Detection | None. Away behaviour comes from geofencing in the First Alert app | Yes — onboard radar in the thermostat plus occupancy and presence detection in the room sensors |
| 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 | Matter certified, but shallow. Matter Alpha's review found the air quality readings the thermostat measures are not exposed over Matter at all, and scheduling still has to happen on the thermostat or in the First Alert app |
| 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 | First Alert app by Resideo (required — you cannot generate the Matter pairing code without it), 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 | ENERGY STAR certified and rebate-eligible; Resideo pitches enrolment in utility energy-management programs |
| Account or Subscription Needed | No subscription. A First Alert account is required | No subscription for thermostat features. A First Alert account is required, and Resideo ships several different apps which reviewers found confusing |
| Warranty | 24 months | 24 months |
| Colors | Gray, White | Black, White |
Category Scores
C-Wire Freedom
The Honeywell Home X8S (X8VMC8B/U) leads clearly here, 4.5 against 1.0 — a 3.5-point margin on how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category.. If that is what you are buying for, the Honeywell Home X2S (RTH2CWF) does not close the gap elsewhere.
HVAC Coverage
The Honeywell Home X8S (X8VMC8B/U) leads clearly here, 8.0 against 6.0 — a 2.0-point margin on stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals. If that is what you are buying for, the Honeywell Home X2S (RTH2CWF) does not close the gap elsewhere.
Multi-Room Sensing
The Honeywell Home X8S (X8VMC8B/U) leads clearly here, 9.0 against 1.0 — a 8.0-point margin on remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature. If that is what you are buying for, the Honeywell Home X2S (RTH2CWF) does not close the gap elsewhere.
Smart Home Integration
The Honeywell Home X2S (RTH2CWF) and Honeywell Home X8S (X8VMC8B/U) are level here, at 6.5/10 each. matter, Apple Home, Alexa and Google support — and how much each one actually exposes is not what separates these two — look to the categories where the scores diverge.
Scheduling & Learning
The Honeywell Home X8S (X8VMC8B/U) leads clearly here, 7.5 against 5.5 — a 2.0-point margin on learning, geofencing, away detection and how much of it works without babysitting the app. If that is what you are buying for, the Honeywell Home X2S (RTH2CWF) does not close the gap elsewhere.
Display & On-Device Control
The Honeywell Home X8S (X8VMC8B/U) leads clearly here, 9.5 against 5.0 — a 4.5-point margin on screen quality and how much you can do at the wall instead of in the phone app. If that is what you are buying for, the Honeywell Home X2S (RTH2CWF) does not close the gap elsewhere.
Installation
The Honeywell Home X2S (RTH2CWF) leads clearly here, 7.0 against 6.0 — a 1.0-point margin on wiring complexity, guided setup, and how likely a DIY install is to end in a service call. If that is what you are buying for, the Honeywell Home X8S (X8VMC8B/U) does not close the gap elsewhere.
Value
The Honeywell Home X2S (RTH2CWF) leads clearly here, 8.5 against 7.0 — a 1.5-point margin on what the money buys once accessories, adapters and sensors are added in. If that is what you are buying for, the Honeywell Home X8S (X8VMC8B/U) does not close the gap elsewhere.
Best For
Choose the Honeywell Home X2S (RTH2CWF) if…
- • You want to spend less — it's $140 cheaper.
- • Your main use case is budget.
Choose the Honeywell Home X8S (X8VMC8B/U) if…
- • Multi-Room Sensing matters most to you — the Honeywell Home X8S (X8VMC8B/U) scores 9.0/10 here (remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature).
- • Display & On-Device Control matters most to you — the Honeywell Home X8S (X8VMC8B/U) scores 9.5/10 here (screen quality and how much you can do at the wall instead of in the phone app).
- • C-Wire Freedom matters most to you — the Honeywell Home X8S (X8VMC8B/U) scores 4.5/10 here (how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category.).
- • HVAC Coverage matters most to you — the Honeywell Home X8S (X8VMC8B/U) scores 8.0/10 here (stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals).
- • Scheduling & Learning matters most to you — the Honeywell Home X8S (X8VMC8B/U) scores 7.5/10 here (learning, geofencing, away detection and how much of it works without babysitting the app).
Pros & Cons
Honeywell Home X2S (RTH2CWF)
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 X8S (X8VMC8B/U)
Pros
- +Up to 20 room sensors at 200ft range — more sensor coverage than any other thermostat in this comparison bar the ecobees
- +5in colour touchscreen with a customisable idle screen, and it can display a Ring or First Alert doorbell feed
- +Radar occupancy in the thermostat plus presence detection in each sensor, at $40 under the ecobee Premium
- +The C-Wire Adapter is free — by mail-in voucher — where Amazon, Copeland and ecobee's Essential all charge for theirs
Cons
- −Matter support is thin: air quality data is not exposed over Matter at all and you still cannot schedule through it
- −You must install the First Alert app just to generate the Matter code, which defeats much of the point of Matter
- −Resideo's own page and Home Depot's listing give different stage counts for the same thermostat — verify against your system before buying
- −The free C-wire adapter is a mail-in voucher, not a part in the box, so a C-wire-less install stalls until it arrives
- −Reviewers hit setup failures at launch and found the doorbell integration buried and limited to Ring and First Alert VX1
Shop by Need
FAQs
Is the Honeywell Home X2S (RTH2CWF) or Honeywell Home X8S (X8VMC8B/U) better overall?+
Based on our 8-category scoring, the Honeywell Home X8S (X8VMC8B/U) comes out ahead overall. See the full breakdown in the scores section above — the right pick still depends on which categories matter most for your use case.
Which is better for Multi-Room Sensing, the Honeywell Home X2S (RTH2CWF) or the Honeywell Home X8S (X8VMC8B/U)?+
The Honeywell Home X8S (X8VMC8B/U) scores higher on Multi-Room Sensing (9.0/10 vs 1.0/10) — remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature.
Which is better for Display & On-Device Control, the Honeywell Home X2S (RTH2CWF) or the Honeywell Home X8S (X8VMC8B/U)?+
The Honeywell Home X8S (X8VMC8B/U) scores higher on Display & On-Device Control (9.5/10 vs 5.0/10) — screen quality and how much you can do at the wall instead of in the phone app.
Which is better for C-Wire Freedom, the Honeywell Home X2S (RTH2CWF) or the Honeywell Home X8S (X8VMC8B/U)?+
The Honeywell Home X8S (X8VMC8B/U) scores higher on C-Wire Freedom (4.5/10 vs 1.0/10) — how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category..
Which is better for HVAC Coverage, the Honeywell Home X2S (RTH2CWF) or the Honeywell Home X8S (X8VMC8B/U)?+
The Honeywell Home X8S (X8VMC8B/U) scores higher on HVAC Coverage (8.0/10 vs 6.0/10) — stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals.
Is the Honeywell Home X2S (RTH2CWF) worth the price difference over the Honeywell Home X8S (X8VMC8B/U)?+
The Honeywell Home X2S (RTH2CWF) is the cheaper option at $79.99 versus $219.99. Whether the pricier model is "worth it" depends on how much you value its lead in Multi-Room Sensing.
Which is better suited to my use case?+
The Honeywell Home X2S (RTH2CWF) is the better fit if you mainly care about budget. The Honeywell Home X8S (X8VMC8B/U) is the better fit for multi-room.
What's the warranty on the Honeywell Home X2S (RTH2CWF) vs the Honeywell Home X8S (X8VMC8B/U)?+
The Honeywell Home X2S (RTH2CWF) ships with a 24-month warranty; the Honeywell Home X8S (X8VMC8B/U) ships with a 24-month warranty. Always confirm current terms on the manufacturer's site before buying.
Should I wait for the next model instead of buying either of these?+
If either model is more than two years old, a successor may be close — check the "Latest Model" link on each product page. Otherwise, both are current, well-supported options and there's no strong reason to wait.
Cheaper Option
Sensi Lite (ST25) — $79.00
Premium Option
Google Nest Learning Thermostat (4th gen) — $239.99
Specifications and prices for both products last verified . Scores are calculated from published specifications — see how we compare products.