What are the top-rated smart thermostats under £200?

Sensibo Sky is an IR-based smart controller that converts AC units with remotes into Wi‑Fi controllable devices, offering app control, scheduling, geofencing, and basic temperature and humidity sensing. It suits users who want remote and voice control for window, split, or portable ACs without replacing the unit.

The ecobee3 lite is a budget smart thermostat offering remote app control, geofencing, Smart Recovery, and compatibility with Alexa, Google Assistant, and Apple HomeKit. It omits built-in Alexa and included room sensors but supports external sensors and provides energy-saving features like Eco+ and HomeIQ reports, suitable for users who want core smart thermostat features without extra hardware.

The Cielo Breez Eco is a Wi‑Fi smart controller for mini‑split, window, and portable ACs that provides remote control, scheduling, geofencing, usage history, and humidity/temperature monitoring through the Cielo Home app. It integrates with major smart assistants and supports automation via IFTTT and Siri Shortcuts, suited for retrofit smart control of single‑zone AC units.

Mysa is a line-voltage smart thermostat for electric baseboard and similar high-voltage heaters that provides Wi‑Fi control, energy monitoring, scheduling, humidity sensing, and integration with major voice assistants. It suits users who want per-room smart control and energy usage reporting without an external hub.

Budget smart thermostat that's ENERGY STAR certified, supports remote control and scheduling via the Alexa app, and integrates with Alexa and Ring. Requires a C-wire or power adapter kit and is designed for most 24 V HVAC systems; it's a simple, low-cost option for Alexa users.

Entry-level smart thermostat with Wi‑Fi, Soli presence sensing, Quick Schedule, Eco features and remote control through the Google Home app. It's energy‑efficient, compatible with most 24V HVAC systems and suits users who want basic smart control and energy savings without adaptive learning.

The X2S is an ENERGY STAR certified, Matter-certified WiFi smart thermostat offering flexible scheduling, auto-away, humidity monitoring, and dual-band WiFi. It supports common 24 VAC HVAC systems, uses a universal mounting plate for easy DIY installation, and provides cloud remote control via the First Alert by Resideo app.