Indoor temperature chart card with background

Who it’s for

Facility managers, building managers, and smart home owners ask “how has the temperature trended in this space recently?” The chart with background combines a trend line with a full-card color signal so current status is visible at a distance.

What it does

A sensor reporting temperature = 21°C renders a time-series trend chart on a card whose background color reflects the current comfort level: blue for Cold (below 18°C), light green for Comfortable (18–24°C), and red for Hot (above 24°C).

• Full-card background color makes temperature comfort level readable across a room without reading the number
• Trend chart of temperature over the selected dashboard time window
• Shows one sensor’s data per widget; add multiple widgets to compare trends and current comfort across spaces

How to set up

Data keys

Key	Role	Type	Description
temperature	Chart series	Timeseries	Indoor temperature in °C; 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
Delta percent	Percentage change	Timeseries	Change against the previous period, as a percentage
Delta absolute	Absolute change	Timeseries	Change against the previous period, in the key’s own unit

The widget ships with a simulated function datasource key labeled Temperature, 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 (°C)	Level	Color
0–18	Cold	Blue
18–24	Comfortable	Green
24+	Hot	Red

How to customize

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

Tips

• On a wall display, the colored background signals current thermal comfort from across the room while the embedded chart shows whether the temperature is stable, drifting, or recovering after a setback period.
• Use consistent comfort colors across all temperature widgets so facilities staff can interpret a colored background anywhere on the dashboard without reading the label.
• A temperature trend that climbs steadily through the afternoon despite a cooling setpoint suggests either a failing actuator on the VAV box or a tenant who has blocked the supply air diffuser — the sustained drift pattern distinguishes this from a brief setpoint override.