Smart thermostats are no longer just a luxury. In 2025, they’re one of the most practical upgrades for your home — helping you control heating and cooling from your phone, save on energy bills, and automate comfort based on your habits.
Whether you’re upgrading an old system or setting up a brand-new smart home, we’ve reviewed the top smart thermostats trusted by homeowners for ease of use, powerful features, and long-term savings. These options are compatible with Alexa, Google Assistant, and most HVAC systems — making your home smarter and more efficient with minimal effort.
Google Nest Learning Thermostat (3rd Gen)
Price: ~£200 / ~$220
Why It’s Popular:
A long-standing favourite for smart home users, the Nest Learning Thermostat adjusts itself based on your routine. It tracks usage, shows energy reports, and can be controlled via app, voice, or the sleek circular dial.
- Learns your temperature preferences automatically
- Works with 95% of HVAC systems
- Remote access via app
- Integrates with Alexa and Google Assistant
- Drawbacks: Doesn’t support Apple HomeKit
Who It’s For: Homeowners who want automation without micromanaging settings.
ecobee Smart Thermostat Premium
Price: ~£230 / ~$250
Why It’s Popular:
ecobee’s Premium model includes a built-in air quality sensor and smart speaker features — letting you control it directly with Alexa. It also supports multi-room temperature sensors for better comfort throughout the house.
- Voice control with Alexa or Siri
- Includes SmartSensor for better room balancing
- Built-in air quality monitoring
- Compatible with Alexa, Google, Apple
Drawbacks: Pricier than most models
Who It’s For: Smart home power users who want full integration and advanced features.
3. Honeywell Home T9 Smart Thermostat
Price: ~£160 / ~$180
Why It’s Popular:
Honeywell’s T9 offers simple setup, a modern touchscreen interface, and strong remote sensor support. It works across major smart platforms and includes geofencing to save energy when you’re away.
- Supports up to 20 sensors
- Geofencing for auto-away mode
- Strong Alexa and Google integration
- Reliable app notifications
Drawbacks: Sensors sold separately
Who It’s For: Families who want consistent temps across rooms and smart scheduling.
4. Amazon Smart Thermostat
Price: ~£70 / ~$80
Why It’s Popular:
This budget-friendly thermostat brings Alexa integration and Energy Star efficiency without the high price tag. Built with Honeywell tech, it’s a solid entry point for voice-controlled climate settings.
- Auto-updates over Wi-Fi
- Voice control via Alexa
- Energy usage insights via the Alexa app
- Very affordable
Drawbacks: No Apple or Google support
Who It’s For: Alexa-first households looking for a low-cost, smart upgrade.
5. Emerson Sensi Touch Smart Thermostat
Price: ~£130 / ~$140
Why It’s Popular:
The Emerson Sensi Touch offers a bright, user-friendly interface and robust control features. It works with all major platforms and doesn’t require a C-wire in many homes, making it a good fit for older systems.
- Easy-to-use touchscreen
- Voice control with Alexa, Google, Siri
- Geofencing and flexible scheduling
- C-wire optional in most cases
Drawbacks: Slightly less polished app experience
Who It’s For: Anyone wanting simple control and reliable performance without rewiring.
FAQs
Do smart thermostats really save money?
Yes, many smart thermostats help reduce energy bills by learning your routine, adjusting the temperature automatically, and avoiding heating or cooling when it’s not needed.
Can I install a smart thermostat myself?
Most smart thermostats are designed for DIY installation and come with step-by-step guides. However, if your system lacks a C-wire, you may need an adapter or professional help.
Do smart thermostats work without Wi-Fi?
Yes, they still function as regular thermostats without Wi-Fi, but you’ll lose access to remote control, scheduling, and energy reports until the internet connection returns.
Are smart thermostats compatible with all heating systems?
Smart Thermostat Comparison Table
| Model | Voice Assistant Support | Learning / Scheduling | Sensors Included | Ideal For |
|---|---|---|---|---|
| Google Nest Learning Thermostat | Google Assistant, Alexa | Auto-learning & smart scheduling | No | Automation-focused users |
| ecobee Smart Thermostat Premium | Alexa, Google, Apple | Custom scheduling + sensors | Yes | Multi-room setups |
| Honeywell Home T9 | Alexa, Google | Geofencing + scheduling | Optional | Families & custom zones |
| Amazon Smart Thermostat | Alexa only | Basic scheduling via app | No | Budget-conscious Alexa users |
| Emerson Sensi Touch | Alexa, Google, Siri | Manual + app scheduling | No | Older HVAC systems |