TUESDAY MORNINGS WERE COSTING £3,400. HE FINALLY SAW WHY.

Posted on: July 14, 2025

Electricity
HVAC
Cost saving

Tuesday Mornings
Were Costing £3,400.
He Finally Saw Why.

A small weekly spike turned out to be a legacy HVAC schedule issue that had been quietly wasting energy before the building even opened.

Building manager identifying a weekly HVAC issue that saved £3,400 a year

Scenario

Rob manages three commercial buildings. He is juggling everything from maintenance to meter readings, often relying on gut feel and scattered spreadsheets.

Tuesdays were always a bit odd. Energy costs were slightly higher, but he chalked it up to staff presence or meeting days. Nothing glaring enough to investigate further.

“I just assumed it was people coming in earlier, or the heating system kicking in a bit harder after the Monday lull.”

What the data showed

Once Rob started using Monitor Hut, he finally had half-hourly data plotted across multiple weeks, across all utilities, in one view.

On his energy dashboard, he spotted a pattern:


Every Tuesday at 5:00am, electricity usage spiked sharply.

The building did not open until 7:30am.

It was not just one week. It happened every Tuesday, in only one building.

Rob zoomed in, tagged the event, and looked at equipment-level detail. His HVAC was sub-metered, so he could trace the spike back to a specific system.

The culprit

A legacy air handling unit was set to an old auto-start program, only running on Tuesdays due to a calendar glitch in the building’s BMS.

Resolution

Rob asked the on-site contractor to update the BMS schedule — a two-minute job once identified.

He also set up an alert in Monitor Hut, just in case anything similar started happening again.

The result

Rob’s wins, in his own words:

Outcome Impact
Annual savings £3,400
Unnecessary CO₂ emissions avoided 1.6 tonnes
Next-step investment Budget approved for two other quick wins

“The tech made it obvious. It’s not that I didn’t care before. I just didn’t have time to spot things like this. Now I do.”

Small anomalies like this often go unnoticed, and they add up. Monitor Hut helps you see what is really happening, so you can fix problems before they become patterns.