# What is the quietest smart thermostat available in the market? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the quietest smart thermostat available in the market?

## Products

### Sensi Sensi Touch 2
```yaml
product: sensi-sensi-touch-2
brand: Sensi
price_gbp: 40.58
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
remote_access: true
voice_control: true
learning_capabilities: false
smart_assistant_compatibility: Amazon Alexa, Google Assistant, Samsung SmartThings
```

- **Price:** £40.58 [^1]
- **Summary:** The Sensi Touch 2 is an ENERGY STAR-certified touchscreen thermostat with remote access, geofencing, flexible 7-day scheduling, usage reports, and compatibility with optional room sensors. It suits households wanting app and voice control with a modern touchscreen, provided their HVAC system has a C-wire.
- **Ideal For:** It is not proven to be the quietest smart thermostat because no acoustic or operating-noise specification was found, although its app, geofencing, and voice control can reduce the need to interact with the wall unit.

### Google Nest Google Nest Learning Thermostat 4th Gen
```yaml
product: google-nest-google-nest-learning-thermostat-4th-gen
brand: Google Nest
price_gbp: 169.71
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
remote_access: For remote control: Wi-Fi internet connection; Nest app
voice_control: Voice control via Google Home app and other Matter-enabled voice assistants
temperature_range: 32 to 104F
energy_consumption: Less than 1 kWh/month
learning_capabilities: Smart Schedule learns the temps you like, and when you like them
smart_assistant_compatibility: Google Home; Matter-enabled apps; voice assistants
```

- **Price:** £169.71 [^2]
- **Summary:** The Nest Learning Thermostat (4th gen) learns your temperature preferences with Smart Schedule and helps manage comfort and energy use. It includes a Nest Temperature Sensor (2nd gen) to help with hot and cold spots, and it lets you control settings from anywhere with the Nest app. It supports Google Home and Matter-enabled apps and voice assistants.
- **Ideal For:** For the quietest smart thermostat available, this model is a learning thermostat that supports system-level control and integrates with Google Home and Matter voice assistants, which avoids adding any separate loud external control unit since it is controlled through the app/assistants.
- **Additional Sources:** [^3], [^4]

### Copeland Sensi Touch Smart Thermostat ST75W
```yaml
product: copeland-sensi-touch-smart-thermostat-st75w
brand: Copeland
price_gbp: 124.71
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
remote_access: true
voice_control: true
learning_capabilities: false
smart_assistant_compatibility: Amazon Alexa, Google Assistant, Apple HomeKit, Samsung SmartThings, Vera
```

- **Price:** £124.71 [^5]
- **Summary:** The ST75W is a touchscreen Wi-Fi thermostat with smartphone control, geofencing, flexible scheduling, usage reports, and smart alerts. It suits homeowners who want broad HVAC and smart-home compatibility without an automatically learning schedule.
- **Ideal For:** It suits shoppers prioritizing a quiet thermostat because it has no reported active noise-producing features, while its remote access, geofencing, and voice control handle temperature changes without frequent interaction at the wall unit.
- **Additional Sources:** [^6]

### Honeywell Home X8S Smart Thermostat
```yaml
product: honeywell-home-x8s-smart-thermostat
brand: Honeywell Home
price_gbp: 177.09
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
remote_access: Yes, through the First Alert app
voice_control: Yes, with Amazon Alexa, Google Assistant, and Apple Home
learning_capabilities: Adaptive Recovery learns how long the heating and cooling system takes to reach the programmed temperature
smart_assistant_compatibility: Matter, Amazon Alexa, Google Assistant, Apple Home
```

- **Price:** £177.09 [^7]
- **Summary:** The Honeywell Home X8S is a touchscreen smart thermostat with remote app control, geofencing-based Auto Away, indoor air-quality monitoring, occupancy detection, and compatibility with major smart-home platforms. It suits homeowners who want advanced comfort management, energy-saving automation, and video doorbell integration from a premium thermostat.
- **Ideal For:** It is not specifically suited to the quietest smart thermostat question because no online source identifies a sound level or silent-operation feature, although its occupancy detection and Adaptive Recovery can manage heating and cooling efficiently.
- **Additional Sources:** [^8]

### Honeywell Home X2S Smart Thermostat
```yaml
product: honeywell-home-x2s-smart-thermostat
brand: Honeywell Home
price_gbp: 62.71
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: false
remote_access: Yes, through the First Alert by Resideo app
voice_control: true
learning_capabilities: false
smart_assistant_compatibility: Amazon Alexa, Apple Home, Google Assistant
```

- **Price:** £62.71 [^9]
- **Summary:** The Honeywell Home X2S is an ENERGY STAR certified Wi-Fi thermostat with flexible scheduling, auto-away functionality, and remote control through the First Alert by Resideo app. It suits homeowners seeking an affordable, DIY-friendly smart thermostat for compatible conventional or heat pump systems.
- **Ideal For:** The X2S may suit someone seeking a quiet smart thermostat because it offers unobtrusive automated scheduling and auto-away operation, although no published noise-level specification was found.

### Eve Eve Thermostat for Underfloor Heating
```yaml
product: eve-eve-thermostat-for-underfloor-heating
brand: Eve
price_gbp: 88.51
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
voice_control: true
energy_consumption: minimal
smart_assistant_compatibility: Apple Home, Google Home, Home Assistant, Samsung SmartThings
```

- **Price:** £88.51 [^10]
- **Summary:** Eve Thermostat is a Matter-over-Thread smart thermostat for water-based underfloor heating. It offers app, voice, schedule, and local control, with silent Triac switching and no subscription or manufacturer cloud dependency.
- **Ideal For:** It suits people seeking the quietest smart thermostat because its Triac technology switches underfloor-heating actuators completely silently, without the clicking associated with mechanical relays.

### Sensi Sensi Touch 2 Smart Thermostat ST76U
```yaml
product: sensi-sensi-touch-2-smart-thermostat-st76u
brand: Sensi
price_gbp: 154.95
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
remote_access: true
voice_control: true
energy_consumption: 1.23 W standby power
learning_capabilities: No machine learning
smart_assistant_compatibility: Amazon Alexa, Google Assistant, Samsung SmartThings
```

- **Price:** £154.95 [^11]
- **Summary:** The Sensi Touch 2 is a touchscreen Wi-Fi thermostat with remote app control, geofencing, flexible scheduling, voice control, and compatibility with room sensors. It suits homeowners who want broad HVAC compatibility and convenient smart-home controls without machine-learning automation.
- **Ideal For:** It suits people seeking a quiet smart thermostat because its remote access, geofencing, flexible scheduling, and voice control can reduce unnecessary HVAC operation, while the product supports energy-usage insights and has no reported machine-learning activity that would add complexity.

### MP Global Products THERMPROTOUCH 7-Day Programmable Smart Home Wi-Fi Floor Thermostat
```yaml
product: mp-global-products-thermprotouch-7-day-programmable-smart-home-wi-fi-floor-thermostat
brand: MP Global Products
price_gbp: 222.76
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
remote_access: Wi-Fi remote access through app or web
voice_control: Yes, with Amazon Alexa and Google Assistant
energy_consumption: 1800/3600 watts
learning_capabilities: Adaptive function calculates when heating should begin to reach the desired temperature on time
smart_assistant_compatibility: Amazon Alexa and Google Assistant
```

- **Price:** £222.76 [^12]
- **Summary:** This Wi-Fi thermostat is designed for electric radiant floor heating and supports 120V or 240V systems, 7-day scheduling, floor sensing, energy-use monitoring, and remote control. It suits homeowners who want programmable, app-connected floor heating with Alexa or Google Assistant voice control.
- **Ideal For:** It suits the search for the quietest smart thermostat because it controls electric radiant floor heating with a remote Wi-Fi connection, adaptive heating, and voice control without requiring a conventional forced-air heating system.

### Sinopé TH1123WF
```yaml
product: sinop-th1123wf
brand: Sinopé
price_gbp: 143.88
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
remote_access: Yes, via Neviweb app
voice_control: Yes, via Amazon Alexa, Apple HomeKit, and Google Assistant
temperature_range: Setpoint 5 °C to 30 °C (41 °F to 86 °F); operating 0 °C to 50 °C (32 °F to 122 °F)
smart_assistant_compatibility: Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings
```

- **Price:** £143.88 [^13]
- **Summary:** The Sinopé TH1123WF is a Wi-Fi thermostat for electric baseboards, convectors, fan-forced convectors, and radiant ceiling heating. It offers remote control, geofencing, scheduling, energy reports, and silent TRIAC operation, making it suitable for homes using compatible electric heating systems.
- **Ideal For:** It suits someone seeking a quiet smart thermostat because its TRIAC switching operates silently without the clicking noise produced by mechanical relays.

### QuietWarmth THERMAEGH 7-Day Smart Home Floor Heating Thermostat with Floor Sensor
```yaml
product: quietwarmth-thermaegh-7-day-smart-home-floor-heating-thermostat-with-floor-sensor
brand: QuietWarmth
price_gbp: 141.93
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
remote_access: Wi-Fi remote access through app or web
voice_control: Voice commands through Alexa and Google Home
temperature_range: 41°F to 104°F
energy_consumption: Energy use monitoring with daily, weekly, and monthly power logging
learning_capabilities: Adaptive function calculates when heating should start to reach the desired temperature on time
smart_assistant_compatibility: Amazon Alexa and Google Home
```

- **Price:** £141.93 [^14]
- **Summary:** This Wi-Fi touchscreen thermostat controls electric radiant floor heating with a 7-day schedule, floor sensor, energy monitoring, and remote app or web access. It suits homeowners who want precise floor-temperature control and smart-home integration for 120V or 240V systems.
- **Ideal For:** It is a strong candidate for the quietest smart thermostat question because it is designed for radiant floor heating with a floor sensor, adaptive scheduling, remote access, and voice control, although no published acoustic rating is provided.
- **Additional Sources:** [^15]

---
## References & Sources
[^1]: Ameren Illinois Energy Efficiency Business Online Store, accessed 2026-09-13. https://amerenillinoiseebusinessstore.com/sensi-touch-2-smart-thermostat/
[^2]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/google-nest-learning-thermostat-4th-gen-with-nest-temperature-sensor-2nd-gen-polished-obsidian/JJ8T5CCSRJ
[^3]: Google Store, accessed 2026-09-13. https://store.google.com/product/nest_learning_thermostat_4th_gen?hl=en-US
[^4]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Google-Nest-Learning-Thermostat-4th-Gen-with-Nest-Temperature-Sensor-2nd-Gen-Polished-Obsidian-GA05169-US/330451443
[^5]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Copeland-Sensi-Touch-Smart-Thermostat-Touchscreen-Color-Display-Wi-Fi-7-day-Programmable-Data-Privacy-White-ST75W/305449064
[^6]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/copeland-sensi-touch-smart-programmable-wi-fi-thermostat-works-with-alexa-c-wire-required-white/J325YX7TTH/sku/6286380/reviews
[^7]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Honeywell-Home-X8S-Smart-Thermostat-Black-X8VMC8B/336936223
[^8]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/honeywell-home-x8s-smart-thermostat-with-room-sensor-video-doorbell-compatibility-and-iaq-control-black/JJ8Z85CX9Q
[^9]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Honeywell-Home-X2S-Smart-Thermostat-Conventional-Heat-Pump-Wi-Fi-Thermostat-RTH2CWF-N/333941085
[^10]: Eve, accessed 2026-09-13. https://www.evehome.com/en/eve-thermostat
[^11]: Sensi, accessed 2026-09-13. https://sensi.copeland.com/en-us/products/touch2-smart-thermostat
[^12]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/QuietWarmth-120-Volt-240-Volt-Programmable-WIFI-Enabled-Smart-Touch-Thermostat-with-Floor-Sensor-THERMPROTOUCH/300241011
[^13]: RFWEL Engr E-Store, accessed 2026-09-13. https://shop.rfwel.com/sinope-th1123wf-smart-wi-fi-thermostat-for-electric-heating/
[^14]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/QuietWarmth-7-Day-Smart-Home-Floor-Heating-Thermostat-w-Floor-Sensor-THERMAEGH/314859809
[^15]: Warm Your Floor, accessed 2026-09-13. https://www.warmyourfloor.com/quietwarmth-programmable-wi-fi-touchscreen-thermaegh.html