Indoor simple humidity chart card

Who it’s for

Facility managers, HVAC engineers, and building managers ask “how has humidity in this space trended over the last few hours or days?” They want a compact trend chart that fits into a multi-room overview without the overhead of a full chart card.

What it does

A sensor reporting humidity = 45% renders a time-series chart of those readings, color-coded by comfort band: orange for Low (0–30%), green for Comfortable (30–60%), and red for High (above 60%). The chart fills the card without a large numerical readout, maximizing the visible time window.

• Trend chart of relative humidity over the selected dashboard time window
• Color-coded by comfort band at each point in time across three levels
• Shows one sensor’s data per widget; add multiple widgets to compare trends across rooms

How to set up

Data keys

Key	Role	Type	Description
humidity	Chart series	Timeseries	Relative humidity in %; change the key name to match your device’s telemetry key
Latest	Latest value	Timeseries	The headline figure above the chart. Its own color ranges are where the band colors are edited

The widget ships with a simulated function datasource key labeled Humidity, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

Value ranges

Range (%)	Level	Color
0–30	Low	Orange
30–60	Comfortable	Green
60+	High	Red

How to customize

• To change the time window — adjust the dashboard time filter to show the last hour, day, or week of humidity readings.
• To change the comfort thresholds — edit the color ranges on the Latest data key.
• To change the chart colors — edit the color of each range on the Latest data key.

Tips

• Use this chart in a grid alongside simple chart cards for temperature and CO2 to give facility staff a side-by-side multi-parameter trend view of all key comfort parameters.
• A 48-hour time window spanning a weekend shows whether the building’s setback mode maintains comfortable humidity or allows it to drift outside range when the HVAC is in economy mode.
• Seasonal drift — humidity falling through December and January as progressively colder outdoor air is heated inside — is normal but useful to spot early so humidification capacity can be reviewed before occupant complaints arise.