# Serin Controller room temperature sensors

> Choose a room temperature source and follow the right setup for Bluetooth, Home Assistant or Serin Link.

Source: https://serin-labs.com/controller/room-sensors.html
Last updated: 2026-10-27

Confirm normal heat-pump control works before adding a sensor. See [how temperature control works](https://serin-labs.com/controller/temperature.html) for source dependencies and fallback.

## Choose and place a sensor

All three firmware options support direct Bluetooth readings; supported thermometers and setup differ by firmware.

Place the thermometer near seating height, away from direct sunlight, heat sources, and the indoor unit's airstream.

[![A checked thermometer sits beside a seated person. Crossed thermometers show three places to avoid: direct sunlight, beside a heater, and in the indoor unit’s airflow.](https://serin-labs.com/assets/diagrams/room-sensor-placement.svg)](https://serin-labs.com/assets/diagrams/room-sensor-placement.svg)

[Enlarge placement illustration](https://serin-labs.com/assets/diagrams/room-sensor-placement.svg).

## Use the controller's sensor settings

With HomeKit-compatible or Matter-compatible firmware, [configure a Bluetooth room sensor](https://serin-labs.com/controller/sensors-web.html) in the web interface. Choose one source or average selected remote sources. For Serin Link, see [Serin Link as the temperature source](https://serin-labs.com/controller/link.html#sensor).

[![Room Sensor settings with Single and Average choices and two Bluetooth thermometers selected for an average](https://serin-labs.com/assets/content/844/media/webui-sensor.png.9bc5f320b7ce.webp)](https://serin-labs.com/assets/media/webui-sensor.png)

Room Sensor settings in the HomeKit-compatible web interface.

## Choose an ESPHome sensor route

A Bluetooth proxy forwards readings to Home Assistant; direct sensor configuration reads them on the controller.

### Included Govee thermometer

[Add the thermometer to Home Assistant](https://serin-labs.com/controller/sensors-home-assistant.html#esphome-govee) using a Bluetooth adapter or the controller's proxy, then forward its temperature.

### An existing Home Assistant sensor

[Use a temperature entity](https://serin-labs.com/controller/sensors-home-assistant.html) from Zigbee, Z-Wave, Bluetooth or another integration. Home Assistant must remain available.

### A Bluetooth thermometer read directly

[Configure direct Bluetooth reading in ESPHome](https://serin-labs.com/controller/sensors-esphome.html). This needs custom YAML for the sensor and works without Home Assistant forwarding readings.

### A paired Serin Link

[Use Serin Link as the room sensor](https://serin-labs.com/controller/link.html#sensor). Select it as the source after pairing; readings go directly to the controller.

## Check the reading and control

Compare the controller's room reading with your selected source, then check that a climate command reaches the indoor unit.

If the indoor unit reports no temperature with its built-in sensor, follow [CN105 troubleshooting](https://serin-labs.com/troubleshooting.html#cn105) before changing the sensor configuration.