Indoor temperature range chart

Who it’s for

Facility managers, building managers, and energy managers ask “how long was this space outside the comfort range over the past day or week, and when did the excursions happen?” A range chart with data zoom reveals the duration and pattern of thermal comfort violations that a simple line chart obscures.

What it does

A sensor reporting temperature = 21°C renders a time-series area chart where the trace is filled with the comfort color for each moment in time: blue when the reading is Cold (below 18°C), light green when Comfortable (18–24°C), and red when Hot (above 24°C). A data zoom slider lets users focus on any sub-range of the selected time window.

• Color-coded area chart shows not just the temperature value but the comfort status for every point in the history
• Data zoom slider lets users drill into overnight cool-down periods, morning warm-up, or peak afternoon heat without changing the dashboard time filter
• Shows one sensor’s data per widget; add multiple widgets to compare thermal profiles across rooms or floors

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

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 — open the widget settings and adjust the band boundaries.
• To change the range colors — edit the color for each comfort band in the widget settings.

Tips

• Set the time window to one week and look at overnight color patterns: a chart that stays green through the night means the building is failing to achieve its temperature setback, wasting heating or cooling energy outside occupied hours.
• Use the data zoom to measure exactly how many hours a space spent in the red band on a hot day — this duration metric is more useful for an energy audit or a comfort complaint investigation than a peak temperature reading alone.
• Comparing range charts for spaces on opposite sides of the building quickly identifies which facades have the worst solar gain, informing decisions about blind schedules or glass film installation.