# What are the best smart thermostats for small homes or apartments? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the best smart thermostats for small homes or apartments?

## Products

### Amazon Amazon Smart Thermostat (S6ED3R)
```yaml
product: amazon-amazon-smart-thermostat-s6ed3r
brand: Amazon
price_gbp: 29.51
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: User device based
energy_consumption: 0.89
smart_home_compatibility: Amazon Alexa
voice_assistant_compatibility: Alexa-enabled device required for voice control
```

- **Price:** £29.51 [^1]
- **Summary:** Amazon Smart Thermostat (S6ED3R) is an ENERGY STAR certified, Wi-Fi thermostat designed for most 24V HVAC systems. It uses Alexa for scheduling/voice control via the Alexa app and Alexa-enabled devices, and supports user device based geofencing. It includes humidity sensing and standby power of 0.89 W.
- **Ideal For:** It fits small homes or apartments running common 24V forced-air, heat pump, or radiant boiler systems and works with Alexa, offering app-based control plus geofencing based on your user device.
- **Additional Sources:** [^2]

### ecobee ecobee Smart Thermostat Premium (EB-STATE6-01)
```yaml
product: ecobee-ecobee-smart-thermostat-premium-eb-state6-01
brand: ecobee
price_gbp: 154.95
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: User device based
temperature_range: 45° to 92°F
learning_capabilities: Learns your routine and recommends changes to your thermostat schedule
smart_home_compatibility: Apple HomeKit, Amazon Alexa, Google Assistant, SmartThings, IFTTT
voice_assistant_compatibility: Alexa Built-in, Siri
```

- **Price:** £154.95 [^3]
- **Summary:** ecobee Smart Thermostat Premium combines scheduling automation with built-in occupancy sensing and home/away adjustments to save energy automatically. It also supports voice control (Alexa Built-in or Siri when enabled via an Apple Home hub) and provides smart home integrations like Apple HomeKit, Amazon Alexa, Google Assistant, SmartThings, and IFTTT. It's a good fit for people who want hands-free control plus automatic comfort management in small homes or apartments.
- **Ideal For:** It's well-suited for small apartments because it includes SmartSensor for room-by-room hot and cold spot control and uses home/away automation to adjust when you leave and restore comfort when you return.
- **Additional Sources:** [^4]

### Emerson Sensi ST55
```yaml
product: emerson-sensi-st55
brand: Emerson Sensi
price_gbp: 95.92
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
temperature_range: 45 to 99°F
energy_consumption: About 23% annual HVAC energy savings
learning_capabilities: false
smart_home_compatibility: Amazon Alexa, Google Home, Samsung SmartThings
voice_assistant_compatibility: Amazon Alexa, Google Assistant, Apple Siri
```

- **Price:** £95.92 [^5]
- **Summary:** The Emerson Sensi ST55 is an ENERGY STAR-certified smart thermostat with Wi-Fi, remote app control, flexible seven-day scheduling, usage reports, and geofencing. It suits people who want straightforward smart control and broad HVAC compatibility without a touchscreen or behavior-learning features.
- **Ideal For:** The ST55 suits small homes or apartments because its traditional-size design, remote app control, geofencing, seven-day scheduling, and compatibility with most HVAC systems provide practical automation without requiring a larger or more advanced learning thermostat.
- **Additional Sources:** [^6]

### Sensibo Air
```yaml
product: sensibo-air
brand: Sensibo
price_gbp: 168.98
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
energy_consumption: 5V 1A micro USB adapter
learning_capabilities: Climate React adjusts AC operation based on temperature, humidity, and air quality
smart_home_compatibility: Apple HomeKit, SmartThings, IFTTT, API
voice_assistant_compatibility: Google Home, Amazon Alexa, Apple Siri
```

- **Price:** £168.98 [^7]
- **Summary:** Sensibo Air is a smart AC controller for remote-controlled air conditioners and heat pumps, including mini-splits, window units, portable units, and central systems. It adds app control, geofencing, scheduling, temperature and humidity sensing, Climate React automation, and voice control, making it well suited to apartment dwellers who want convenient comfort and lower energy use.
- **Ideal For:** Sensibo Air suits small homes or apartments because one compact controller can automate a remote-controlled AC with geofencing, 7-day scheduling, temperature and humidity sensing, and Apple HomeKit, Google Home, and Alexa compatibility.
- **Additional Sources:** [^8]

### Mysa Smart Thermostat
```yaml
product: mysa-smart-thermostat
brand: Mysa
price_gbp: 80.43
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
temperature_range: 41-86 °F
energy_consumption: 3800 W maximum
learning_capabilities: Smart learning features
smart_home_compatibility: Apple HomeKit, Amazon Alexa, Google Home
voice_assistant_compatibility: Amazon Alexa, Google Assistant, Apple HomeKit
```

- **Price:** £80.43 [^9]
- **Summary:** The Mysa Smart Thermostat is a Wi-Fi thermostat for high-voltage electric heating systems, including baseboard, fan-forced in-wall, self-contained hydronic baseboard, and in-ceiling radiant heaters. It offers app control, scheduling, geofencing, energy reports, zoning, and integration with major smart-home platforms, making it well suited to homeowners who want room-by-room control and energy savings.
- **Ideal For:** It suits small homes or apartments with high-voltage electric heating because geofencing, scheduling, zoning, and app-based energy reports can reduce heating in unoccupied rooms while its 41-86 °F control range supports precise room-by-room comfort.
- **Additional Sources:** [^10], [^11]

### ecobee Smart Thermostat Enhanced, Model EB-STATE6L-01
```yaml
product: ecobee-smart-thermostat-enhanced-model-eb-state6l-01
brand: ecobee
price_gbp: 125.44
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
temperature_range: Desired temperature: 45°F to 92°F; display: 40°F to 100°F; operating: 14°F to 122°F
learning_capabilities: Learns temperature preferences and schedule; adjusts based on occupancy, humidity, and energy costs
smart_home_compatibility: Apple HomeKit, Amazon Alexa, Google Assistant, Samsung SmartThings, IFTTT
voice_assistant_compatibility: Amazon Alexa, Google Assistant
```

- **Price:** £125.44 [^12]
- **Summary:** The ecobee Smart Thermostat Enhanced uses occupancy sensing, scheduling, humidity adjustment, and energy-saving recommendations to help maintain comfort automatically. It suits households wanting broad smart-home integration and remote control through a smartphone or smartwatch.
- **Ideal For:** It suits small homes or apartments because occupancy sensing and geofencing can reduce heating and cooling when the space is empty, while its 45°F to 92°F desired-temperature range and broad voice-assistant compatibility provide convenient control.
- **Additional Sources:** [^13], [^14]

### Honeywell Home T5 7-Day Smart Wi-Fi Thermostat, Model RTH8800WF2022
```yaml
product: honeywell-home-t5-7-day-smart-wi-fi-thermostat-model-rth8800wf2022
brand: Honeywell Home
price_gbp: 34.67
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
learning_capabilities: Smart Response learns patterns to determine heating and cooling needs
smart_home_compatibility: Amazon Alexa, Apple HomeKit, Google Assistant
voice_assistant_compatibility: Amazon Alexa, Apple Siri, Google Assistant
```

- **Price:** £34.67 [^15]
- **Summary:** The Honeywell Home T5 is an ENERGY STAR certified smart thermostat with flexible 7-day scheduling, geofencing, smartphone control, energy reports, and alerts. It suits apartments and small homes with compatible 24 VAC HVAC systems and a C-wire.
- **Ideal For:** It suits small homes or apartments because geofencing and flexible scheduling can adjust temperatures automatically, while Alexa, HomeKit, and Google Assistant compatibility provides convenient control without requiring a more advanced learning thermostat.
- **Additional Sources:** [^16]

### Copeland Sensi Smart Thermostat, Model ST55
```yaml
product: copeland-sensi-smart-thermostat-model-st55
brand: Copeland
price_gbp: 73.78
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
temperature_range: 45 to 99°F
energy_consumption: About 23% HVAC energy savings
learning_capabilities: No learning capability found
smart_home_compatibility: Amazon Alexa, Google Home, Samsung SmartThings
voice_assistant_compatibility: Amazon Alexa, Google Assistant, Apple Siri
```

- **Price:** £73.78 [^5]
- **Summary:** The Copeland Sensi ST55 is an ENERGY STAR certified Wi-Fi thermostat with remote control, flexible 7-day scheduling, usage reports, smart alerts, and geofencing. It suits apartments and small homes that need straightforward HVAC control and broad smart-home integration without requiring a c-wire for most systems.
- **Ideal For:** It suits small homes or apartments because its geofencing, 7-day scheduling, remote app control, and traditional footprint help manage comfort and energy use without requiring a c-wire for most systems.
- **Additional Sources:** [^17]

### Honeywell Home T9 WiFi 7-Day Programmable Smart Thermostat with Smart Room Sensor, Model RCHT9610WFSW2003
```yaml
product: honeywell-home-t9-wifi-7-day-programmable-smart-thermostat-with-smart-room-sensor-model-rcht9610wfsw2003
brand: Honeywell Home
price_gbp: 154.22
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
geofencing: true
learning_capabilities: Smart Response and Adaptive Recovery learn heating and cooling cycle times
smart_home_compatibility: Apple HomeKit, Samsung SmartThings, Amazon Alexa, Google Assistant, Microsoft Cortana
voice_assistant_compatibility: Amazon Alexa and Google Assistant
```

- **Price:** £154.22 [^18]
- **Summary:** The Honeywell Home T9 is an ENERGY STAR certified smart thermostat with Wi-Fi, 7-day scheduling, geofencing, and a Smart Room Sensor that can prioritize occupied rooms. It suits homes with compatible 24V HVAC systems, especially users who want room-by-room comfort and voice control.
- **Ideal For:** It suits small homes or apartments because its included Smart Room Sensor can prioritize occupied rooms, while geofencing and Smart Response automatically adjust comfort and reduce unnecessary heating or cooling.

---
## References & Sources
[^1]: Conservation Mart, accessed 2026-09-13. https://www.conservationmart.com/amazon-smart-thermostat-works-with-alexa-and-ring-c-wire-required-s6ed3r/
[^2]: PECO Marketplace, accessed 2026-09-13. https://www.pecomarketplace.com/peco/amazon-smart-thermostat-1.html
[^3]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/ecobee-premium-smart-programmable-touch-screen-thermostat-with-siri-alexa-apple-homekit-and-google-assistant-black/JXC53VG8P8
[^4]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/ecobee-Smart-Thermostat-Premium-with-Smart-Sensor-and-Air-Quality-Monitor-Wifi-Works-with-Siri-Alexa-Google-Assistant-EB-STATE6-01/319478899
[^5]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Copeland-Sensi-Smart-Thermostat-Wi-Fi-7-day-Programmable-No-C-Wire-Required-for-Most-Systems-ST55/301231478
[^6]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/emerson-sensi-smart-programmable-wi-fi-thermostat-works-with-alexa-white/J325YX79WC
[^7]: BIG W, accessed 2026-09-13. https://www.bigw.com.au/product/sensibo-air-smart-wi-fi-air-conditioner-controller-temperature-and-humidity-sensor-motion-sensor-sensibo-air-wh-/p/9902882543
[^8]: Kogan, accessed 2026-09-13. https://www.kogan.com/au/buy/itz-sensibo-air-smart-wi-fi-air-conditioner-controller-with-temperature-humidity-motion-sensor-smtssb1003/
[^9]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Mysa-Smart-Programmable-Wi-Fi-Thermostat-for-Electric-Baseboard-Heaters-BBV1-1-01-NA-US/317172292
[^10]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/mysa-smart-programmable-wi-fi-thermostat-white/J3YQ6CSG3F/sku/6520815
[^11]: Focus on Energy Marketplace, accessed 2026-09-13. https://focusonenergymarketplace.com/default/mysa-electric-baseboard-heating-line-voltage-thermostat
[^12]: Dell, accessed 2026-09-13. https://www.dell.com/en-us/shop/ecobee-smart-thermostat-enhanced/apd/ac102583/home-automation
[^13]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/ecobee-Smart-Thermostat-Enhanced-Programmable-Wifi-Works-with-Siri-Alexa-Google-Assistant-Energy-Star-Certified-Smart-Home-EB-STATE6L-01/319479265
[^14]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/ecobee-enhanced-smart-programmable-touch-screen-wi-fi-thermostat-with-alexa-apple-homekit-and-google-assistant-black/JXC53VGL72/sku/6500667
[^15]: Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/T5-7-Day-Smart-Wi-Fi-Thermostat-with-Geofence-Technology-and-Auto-Changeover-Energy-Star-Certified-RTH8800WF2022/322082212
[^16]: Rochester Utilities Store, accessed 2026-09-13. https://ny.home.myorustore.com/Thermostats-and-Temperature/I-HONT5STAT-01-GEN2-XXXX-V1.html
[^17]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/copeland-sensi-smart-programmable-wi-fi-thermostat-works-with-alexa-white/J325YX79WC
[^18]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Honeywell-Home-T9-WiFi-7-Day-Programmable-Smart-Thermostat-with-Touchscreen-Display-and-Smart-Room-Sensor-RCHT9610WFSW2003/312604036