HVAC automation using Humidex

cam2000 · January 7, 2025, 11:36pm

Has anyone created an automation which pairs humidity with temperature to create a comfortable HVAC environment?
There’s a formula which reads

Humidex – Air temperature in Celsius + 0.5555 (e – 10)
Where:
e = 6.11 x exp [5417.7530 (1/273.16 – 1/Air temperature in Celsius +273.16)]

Humidex reading seems to gather the inputs of temp and humidity to give a comfort level. Wondering if I can use this to formulate some sort of automation using my HVAC.

BebeMischa · January 7, 2025, 11:45pm

Maybe this can help you to achieve, what you are looking for. Using the entities created by this integration could get you there…

Robjharr · January 8, 2025, 2:39am

Does your HVAC system have a De humidification setting already ?Also what kind of thermostat do you have?

cam2000 · January 8, 2025, 8:39am

Yes there is a Dry mode on it. My sensor is a fairly basic temp and humidity zigbee sensor.

cam2000 · January 8, 2025, 8:41am

Do I need more sensors for this to work? Apologies if that is a daft question.

BebeMischa · January 8, 2025, 12:57pm

a temperature sensor and a humidity sensor is needed for it to work.

cam2000 · January 9, 2025, 4:05am

I dowloaded that HAC - I suppose now I have to work out how to create an automation which juggles temperature and humidity - the dry function makes it colder - not sure how to handle that.

BebeMischa · January 9, 2025, 5:04am

github.com

dolezsa/thermal_comfort/blob/170860846ff5f39bb1695bf66803764e21769bf8/documentation/config_flow.md

# Initial Configuration
## In your Home Assistant UI go to "Configuration", then click "Devices & Services"

![Config Dashboard](https://raw.githubusercontent.com/dolezsa/thermal_comfort/master/screenshots/config_dashboard.png)

## Make sure Integrations is selected and click the "+" button in the bottom right corner

![Config Integrations](https://raw.githubusercontent.com/dolezsa/thermal_comfort/master/screenshots/config_integrations.png)

## Search for or scroll down to find "Thermal Comfort" and select it

![Config Integrations Search](https://raw.githubusercontent.com/dolezsa/thermal_comfort/master/screenshots/config_integrations_search.png)

## Name your virtual device and select the temperature and humidity sensor you want to use

*Note: Enable [advanced mode](https://www.home-assistant.io/blog/2019/07/17/release-96/#advanced-mode)
in your user profile if you want additional options.
We filter the sensors to include only those who have the correct device class.
If you want to select other make sure to enable
[advanced mode](https://www.home-assistant.io/blog/2019/07/17/release-96/#advanced-mode)*

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then you should have more sensors:

github.com

dolezsa/thermal_comfort/blob/170860846ff5f39bb1695bf66803764e21769bf8/documentation/sensors.md

# Sensors:

<dl>
  <dt><strong>Absolute Humidity</strong> <code>absolute_humidity</code></dt>
  <dd>
    Absolute humidity is a measure of the actual amount of water vapor
      (moisture) in the air.
  </dd>
  <dt><strong>Heat Index</strong> <code>heat_index</code></dt>
  <dd>
    The heat index combines air temperature and relative humidity to posit a
    human-perceived equivalent temperature.
  </dd>
  <dt><strong>Humidex + Perception</strong> <code>humidex</code> <code>humidex_perception</code></dt>
  <dd>
    The humidex (humidity index) describes how hot the weather feels to an average person as a result of the combined effect of heat and humidity. It is calculated from the dew point.
  </dd>
  <dt><strong>Dew Point + Perception</strong> <code>dew_point</code> <code>dew_point_perception</code></dt>
  <dd>
    The dew point is the temperature to which air must be cooled to become

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heat_index is what you are looking for