There is one call I have learned to take seriously, and it is the one that sounds like an accounting problem.
Too hot. Too cold. Too expensive.
The first two send somebody upstairs with a ladder. The third one goes into a spreadsheet and dies there.
A high-rise in New York had the third kind. The bills were enormous, nobody could say why, and nothing in the building was broken. No alarm had gone off all year.
The setting that decides when that tower pulls in outside air had been programmed backwards.
On a ninety degree afternoon it opened wide and pulled the heat indoors. On a sixty degree night, when the outside air was cold enough to cool the building for free, it shut and ran the machines anyway.
It paid to bring the heat in. Then it paid again to take it back out.
When somebody finally went and looked, nothing needed replacing. No crane. No shutdown. No part on order. Some of these are just program numbers.
This tower was not neglected. It had staff, a maintenance program, a contractor who wrote the software, and a wall of screens summarizing the whole place in colors. Every person in that chain did their job. The building still ran backwards for a season, and the only thing that complained was the invoice.
The Reality:
The machine was honest.
It did exactly what it was told, every minute, all summer. An instruction cannot raise an alarm about itself. There is no sensor for wrong.
The screen in your mechanical room is not a window. It is a report of what the system believes it is doing, written by the same system. Believing and doing are two different events, and nobody in the chain is paid to check the distance between them.
That distance is bigger than the industry likes to say out loud. Researchers at Lawrence Berkeley National Laboratory looked at 317 buildings and found that on any given day, roughly forty percent of air handlers are carrying a reported fault. Those are the boxes that move conditioned air around a building. Not broken. Faulted, and running, while the building goes about its day.
Forty percent is not a maintenance problem. Forty percent is a measurement problem.
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And a backwards setting is the most protected version of it, because it never degrades. A dying pump gets louder. A leaking valve leaves a stain. A control programmed inside out produces a building that is warm, quiet, comfortable and expensive, and nobody escalates comfortable.
The cost is not a repair. Nothing needed replacing. The cost is the season, and the season before it, and however many seasons that setting sat there being obeyed. There is no invoice for money a building did not have to spend. It shows up as a property that simply costs more to run than it should, quietly, every month, until somebody goes and looks.
What I would do this week if it were my building.
The first part costs nothing but an afternoon, and you do not need to touch a single piece of equipment.
Start with the bills, and work in consumption, not dollars. Twenty-four months minimum, thirty-six is better, electricity and gas side by side. Rates move for reasons that have nothing to do with your building. Kilowatt hours and therms are the building talking. Dollars are the building talking through an interpreter with an agenda.
Then set a benchmark. What should a property of this type, this age, this use be consuming? You are not looking for a grade. You are looking for the gap between what it does and what it ought to do, because that gap is the size of the opportunity.
Then run the weather test, and this is the one that catches a backwards control.
Lay consumption against the weather month by month (HINT: Utility companies already show this on your bill, you just have to read it). A building’s energy use should track the weather closely, because the weather is what the systems are responding to. When consumption stops tracking the weather, something inside has stopped responding to the weather and started making its own decisions.
The shoulder months are where that shows up. October. April. May. Mild weather, the outside air doing most of the work for free, the machines mostly idle. A building with a working outside-air control should fall off a cliff in those months. If your shoulder months look like your summer months, something is not opening when it should.
Two other tells worth ten minutes. If heating and cooling energy both climb in the same month, you have two systems working against each other. And if consumption is flat across a year in a climate that is not flat, that is a building running at one speed regardless of the weather.
Then go look at the thing. Not the screen. The thing.
Pick a cool morning, go to where the building takes in outside air, and see with your own eyes whether it is open. If the screen says open and the opening is shut, or the screen says closed and the louvers are wide on a ninety degree afternoon, you have just found an entire category of problem for the price of a walk.
That walk is the whole discipline. Everything else is reading.
If you do not run the building yourself, the same work turns into three questions for whoever does. When was the outside-air control last checked against the actual weather, not against the screen? Who checked it, and what did they physically go and look at? And what did they find, written down, with a date on it?
Vague answers are not a sign somebody is hiding something. They usually mean nobody was ever assigned the check, which you can fix in one email and cannot fix by worrying about it.
The bottom line.
A system reporting fine is not evidence that it is fine. It is evidence that the system has not noticed anything, which is a different claim, and a much weaker one.
The tower in New York had every tool a modern building is supposed to have. Sensors, software, a staff, a service contract, a screen for every system. What it did not have was one person willing to treat the screen as a claim instead of a fact.
Reading a dashboard is not the same skill as reading a building. Anybody can be handed a dashboard.
What you are building is the habit of asking what the dashboard is standing in front of, and then walking down the hall to go see for yourself.
—Jon
P.S. The utility bill is the only part of your building that cannot be programmed. The forms I use to pull one apart, and how to read what comes out, are in The Money Behind the Walls.