Facilities

For whoever looks after a building, a viewport in the office or the plant room shows the air in each meeting room, and anything that needs attention: a failed backup, a hot plant room, a print that's running, free EV chargers.

Temperature and humidity by room — Comfort by room, measured by the meeting-room signs themselves

The case for Switchboard

Problems show up without a dashboard login. Backup failed and Plant room 31.5C appear in red when they happen and disappear when they’re fixed.
Air quality people act on. CO2 and particles are coloured by sensible limits, or your own. A note such as Huddle needs air: open the window or book another room appears only when the room is poor.
Every sign is also a sensor. Each viewport can report its room’s temperature and humidity to Home Assistant. Put up twenty room signs and you have twenty comfort sensors at no extra cost.
Plain sentences, not graphs. Anyone passing can understand EV chargers: 2 of 4 free.
Put it anywhere. No power or network to run, and months on a charge, so it can go in the plant room, by the car park door or in the kitchen.
Comes from what Home Assistant already knows. Any sensor or status becomes a line with your wording, colour and icon.

Setting it up

This screen is two columns:

Left: an Air quality section with one line per sensor, then a Message shown only while the huddle room’s CO2 is over a limit.
Right: a Now section of entity items, each with a condition, a title such as Plant room {state}, and a second line.

The comfort screen is two Air quality sections, one for the signs’ temperatures with your own limits (fair from 24°C, poor from 26°C) and one for their humidity.

See Viewport layouts.