The Thermostat C-Wire Adapter (also known as a common wire adapter, power extender kit, or C-wire transformer) provides a continuous source of power to a smart thermostat when your HVAC system doesn’t already have a dedicated C-wire (common wire).

The Thermostat C-Wire Adapter (also known as a common wire adapter, power extender kit, or C-wire transformer) provides a continuous source of power to a smart thermostat when your HVAC system doesn’t already have a dedicated C-wire (common wire).

Aqara Thermostat W200, the first thermostat to support Apple Adaptive Temperature and Clean Energy Guidance, delivers effortless comfort and smarter energy savings. Your iPhone learns your routine and adjusts automatically—no schedules required. More than a thermostat, it works as a Zigbee and Thread hub with Border Router capabilities, expanding your Matter network and enabling local control across Apple, Google, Alexa, SmartThings, and Home Assistant. Built-in mmWave presence detection, dual-band Wi-Fi, security alert playback, and seamless doorbell streaming and lock control bring powerful automation together—subscription-free and designed for a future-proof smart home.

The C-Wire provides a continuous flow of power to operate more advanced 24-Volt thermostats and is most often needed when upgrading to Wi-Fi and wireless thermostats. The C-Wire Power Adapter converts existing thermostat wires to common wires (C-Wires) to help make Honeywell Home Smart Thermostats compatible with homes that may be missing this "common" wire. Features easy push terminals and an adhesive mount to attach the adapter to the outside of your furnace, while a closed cover conceals internal components — making installation quick and easy.

ecobee Smart Thermostat Premium optimizes comfort while saving energy through superior intelligence and technology. It has a built-in air quality monitor, doorbell Live View, smoke alarm detection, and geofencing technology to understand occupancy. Included SmartSensor eliminates hot and cold spots and adjusts the temperature in the rooms that matter most. Works with Siri*, Alexa, Google Assistant, HomeKit, and SmartThings. *Apple home hub required to enable Siri.
| Pros for Aqara - C-Wire Adapter for W200 Smartq Thermostat - White | |||
|---|---|---|---|
| There were no pros for this product— | There were no pros for this product— | There were no pros for this product— | Overall Performance, Ease of Use, Air Quality Monitoring, Installation, Design |
| Cons for Aqara - C-Wire Adapter for W200 Smartq Thermostat - White | |||
| There were no cons for this product— | There were no cons for this product— | There were no cons for this product— | Compatibility, Accuracy |
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