Venstar integration - how to see wireless sensor temp

Configuration
1

I have 3 Venstar T7900 thermostats in my house and all are integrated with HA using the Venstar integration. Our 2nd floor thermostat receives temperatures from 4 remote sensors in each bedroom, it averages those temps and uses that averaged temp as the “observed” temperature on the thermostat. However, HA only receives the temperature from the onboard thermostat. So, my HA shows the temp is 73 degrees (the onboard temp sensor) while the thermostat shows the correct 69 degrees (the average of all the wireless sensors). Is there a way to receive that averaged temp in HA?

20211203_204516
20211203_2045161920×3410 243 KB

2

The Venstar Local API supports this. Look for the “Space Temp” temp value, its the Control Source (average wireless + thermostat).

http://192.168.1.100/query/sensors (replace IP with that of your Thermostat)

{
    "sensors": [
        {
            "name": "Thermostat",
            "temp": 69,
            "hum": 49
        },
        {
            "name": "Space Temp",
            "temp": 67
        },
        {
            "name": "Outdoor",
            "temp": 39
        },
        {
            "id": 6,
            "name": "Master Bedroom",
            "temp": 68,
            "battery": 99,
            "type": "Remote"
        },
        {
            "id": 7,
            "name": "Front Room",
            "temp": 67,
            "battery": 99,
            "type": "Remote"
        }
    ]
}

As you can see in the above JSON, I have 2 wireless sensors, and an Outdoor sensor. I average the thermostat & wireless sensors as my control source, and use the wired Outdoor sensor to lock out my Heat Pump when the temperature is too low for it to be effective.

Its really a shame that this integration lacks support for the additional sensors, especially since they are exposed in the API.

I’m not sure how far you’re willing to go to get these sensors into your Home Assistant but you could use the MQTT-Venstar-Bridge to expose them as MQTT sensors. Having the battery levels would be nice too, you could get notifications when the need to be changed. I haven’t implemented this yet but its on my ToDo list.

3

Looks like I spoke to soon. I’m on 2021.11 and just tested 2021.12.9 and now the Wireless, Outdoor, and Space temperature sensors are available. Way easier to upgrade than go down the MQTT-Venstar-Bridge route. :wink:

4

Yep, mine reports the averaged wireless sensor temp to HA now. Must have been an update to the integration.