Data Center Cold Aisle Temperature Dashboard

The default band is 18–27 °C cold-aisle inlet per ASHRAE — many sites run the warm end (24–25 °C) to save energy. Treat it as a sensible starting point — your own specification, regulator, equipment manual or product datasheet sets the authoritative limits, and you can read your true band straight off the worst case those documents allow. Edit the readings against whatever band applies to you.

As warm as your hottest inlet allows while staying inside ASHRAE's recommended 27 °C — but the constraint is uniformity, not the average. If top-of-rack inlets are already at 27 °C while the setpoint reads 22 °C, recirculation is eating your margin and you can't raise it safely. Fix containment and blanking first (often worth 3–5 °C of headroom), then raise the setpoint a degree at a time, watching the worst inlet here. Each degree typically trims chiller energy a few percent.

Match the interval to the consequence and the rate of change: where an excursion spoils product or risks safety, log continuously (or as often as you can sample); where it is merely informative, daily or per-shift spot checks suffice. The in-range % and excursion count only mean something if your sampling is regular — sparse, irregular readings hide the excursions between them.

Yes — every reading is stored in this browser's localStorage on your device and nothing is uploaded to any server, which also makes the dashboard usable on sites with strict data policies. For shared, audit-grade records across a team or for regulatory retention, export the values into your own system.