Indoor simple temperature chart card

Who it’s for

Facility managers, building managers, and smart home owners ask “what is the temperature trend for this space and what is the level right now?” They need a compact chart that combines trend and current reading in the smallest possible footprint.

What it does

A sensor reporting temperature = 21°C renders a compact sparkline-style trend line and the current value together in a single card, color-coded by comfort level: blue for Cold (below 18°C), light green for Comfortable (18–24°C), and red for Hot (above 24°C).

• Compact sparkline chart shows temperature direction at a glance without occupying the space of a full chart card
• Live temperature reading in °C with color coding across three comfort bands
• Shows one sensor’s data per widget; add multiple widgets to monitor different rooms side by side

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

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 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.
• To switch units to °F — change the Units field and adjust the thresholds accordingly in the widget settings.

Tips

• The simple chart card fits more rooms per row than the full chart card — use it for a building-wide temperature overview where you only need trend direction and current value, not delta percentages.
• A rising sparkline alongside a Comfortable reading is an early warning that a space will exceed 24°C within the next hour — useful for pre-emptively adjusting the cooling setpoint before occupants start to feel uncomfortable.
• Pair with a humidity simple chart card on the same row for a compact two-variable comfort panel that fits twice as many zones on screen as the full chart cards.