Parts
Sensors, C-Wire Adapters and Wiring
The parts around a thermostat: room sensors, C-wire adapters, transformers, thermostat wire and wall plates.
Most smart thermostat installs that stall do so over power. A C-wire adapter lets the existing wires carry steady power as well as the signals they carried before; a spare conductor or new 18-gauge cable does the same permanently. Check that an adapter's listing names your thermostat and system: many support conventional single-stage systems only.
Wireless room sensors let a thermostat average several rooms or favour the occupied one. Wall plates cover the marks an old, larger thermostat left behind.
What's on your wall now?
No C wire
Adapters and power kits provide steady power over existing wires.
A room that's always off
Room sensors move where the thermostat measures.
Covering an old footprint
Wall plates and trim plates hide holes and paint lines.
accessory compatibility grid
| Image | Product | Type | Works with | Fits | Power | Range | Price on listing |
|---|---|---|---|---|---|---|---|
 | WUKUR CT-1250 C-Wire Adapter WUKUR | C-wire adapter | Push Button | ecobee thermostats without a C-Wire | AC | Not stated | Check current price |
 | Google Nest GA02493-US C-Wire Adapter Google Nest | C-wire adapter | Android, iOS, or Web | Not stated | Not stated | Not stated | Check current price |
 | ecobee EB-PEK2-01 C-Wire Adapter ecobee | C-wire adapter | Touch | Not stated | Not stated | Not stated | Check current price |
 | Google Nest 10807 Room Sensor Google Nest | Room sensor | Application | Not stated | Battery Powered | Not stated | Check current price |
 | Sensi RS01-SG Room Sensor Sensi | Room sensor | Smart Thermostat | Sensi Touch 2 Smart | Battery Powered | Not stated | Check current price |
 | ecobee EB-RSHM2PK-01 Room Sensor ecobee | Room sensor | Amazon Alexa, Apple HomeKit, Google Assistant, IFTTT, SmartThings | Not stated | Battery Powered | up to 60 feet | Check current price |
 | Google Nest T5001SF Room Sensor Google Nest | Room sensor | Nest | Nest Learning | Battery Powered | up to 50 feet | Check current price |
 | Petrichor GWPC-4-White Thermostat Wall Plate Petrichor | Wall plate or cover | Push Button | Google Nest Learning | Corded Electric | Not stated | Check current price |
 | BAOKZZOM EcoPlate2022 Thermostat Wall Plate BAOKZZOM | Wall plate or cover | smart_home_compatible | Not stated | Not stated | Not stated | Check current price |
 | LUX TQ1 Thermostat Wall Plate LUX | Wall plate or cover | Amazon Alexa | Not stated | Not stated | Not stated | Check current price |
No products match that filter.
Figures are the makers' own, quoted with their conditions on each product page. Prices change; each product page links to the current price.