Why Most Buildings Run Like Broken Watches

Tzadok Wienberg’s father spent 40 years repairing watches on Kingston Avenue. He could disassemble a Rolex Submariner, clean every wheel and spring, and put it back together so it kept time within two seconds per day. The whole mechanism fit in the palm of your hand. When Tzadok designs building automation systems now, he sometimes thinks about that workshop and wonders how we ended up here.

The commercial building he’s working on this week has a 400-ton chiller that runs continuously because nobody thought to commission the control sequences after installation. The Department of Energy reports that 30 percent of energy consumed in commercial buildings is wasted. That waste costs $150 billion annually across the United States. Most of this happens not because the equipment is broken, but because the systems controlling that equipment were never properly set up or have drifted so far from their original programming that they barely function.

A mechanical watch has maybe 130 parts. The building automation system in a mid-sized office tower manages thousands of sensors, valves, dampers, and control points. But unlike a watch, where every component has to work or the whole thing stops, building systems can fail in ways that keep them technically operational while hemorrhaging energy. The lights stay on. The temperature holds steady. Nobody notices that the rooftop units are fighting each other or that the economizer dampers are stuck closed.

The Difference Between Precision and Close Enough

When Tzadok’s father adjusted a watch movement, he used a timegrapher that measured accuracy to a fraction of a second. If a mainspring had lost tension or a jewel bearing showed wear, he replaced it. The tolerances were absolute. You could not argue that a watch running five minutes slow per day was “good enough.”

Building automation operates on different standards. The control logic might call for the chiller to shut down when outdoor temperatures drop below 55 degrees, but if the sensor is reading three degrees high, the chiller keeps running. The system logs show everything in normal range. The energy bills tell another story. A recent audit at a Florida public school found that air-cooled chillers ran continuously, multiple air handling units operated around the clock, and dozens of unit ventilators stayed offline despite the building management system showing them as active. The equipment worked. The programming failed.

Tzadok replaces sensors that have drifted out of calibration. He finds dampers that were manually overridden during a maintenance call three years ago and never reset. Sometimes he discovers that the original contractor programmed temperature setpoints in Fahrenheit while the system was configured to read Celsius. These are not complex failures. They are the building equivalent of a watch with a loose screw, except nobody checks the time closely enough to notice it is wrong.

What Happens When Nobody’s Watching

Most building automation systems work best right after commissioning. Someone programs the sequences, tests the equipment, and documents everything. Then the building opens, the commissioning agent leaves, and time starts doing what it does to unattended systems. Research from the Department of Energy shows that poorly configured management systems account for one-fifth of building energy use. That figure represents waste, not consumption.

Scheduling offers the clearest example. A lecture hall at a university heats and cools itself 168 hours per week even though classes only meet for 12 of those hours. The system was programmed five years ago when the course schedule looked different. Nobody updated it. The building burns through energy conditioning empty space because the automation that should prevent that waste is stuck following instructions that no longer apply.

Tzadok pulled data from an office building last month where the lighting schedule showed occupancy from 6 a.m. to 10 p.m., seven days per week. The actual occupancy data from the access control system showed the building was empty most weekends and after 7 p.m. on weekdays. Changing just the lighting schedule saved $24,000 annually. The automation system had all the data it needed. Nobody programmed it to use that data intelligently.

The problem compounds because building automation systems do not learn or adapt. When a tenant moves out and occupancy drops by 30 percent, the ventilation rates stay the same unless someone manually adjusts them. Seasons change but the control algorithms stay static. Equipment ages and its performance drifts, but the system keeps issuing the same commands based on assumptions that stopped being accurate months or years ago.

The Override Problem

Manual overrides represent another failure mode particular to automated buildings. A technician troubleshooting an HVAC issue puts a boiler in manual mode to test something. The test finishes but the override stays in place. Three months later, the building loses heat on the coldest night of the year because the boiler was never returned to automatic mode. The hot water coil in the air handler freezes, bursts, and floods the mechanical room.

These failures happen with enough frequency that they have names. The “forgotten override” appears in every building automation textbook as a cautionary example. The industry has known about this problem for decades. The solution is simple: automatic reversion timers that reset overrides after a specified period. Many systems include this feature. Most sites do not enable it.

Building operators often disable alerts and notifications because the systems generate too many false alarms. Sensor drift triggers warnings about temperature anomalies that do not actually exist. Equipment that was temporarily taken offline for maintenance continues to throw fault codes long after returning to service. After weeks of meaningless alerts, operators stop paying attention. Then when a real problem develops, nobody notices until it becomes expensive.

Different Incentives, Different Results

Tzadok’s father’s customers brought watches back if they did not keep accurate time. The feedback loop was immediate and personal. Building owners might not realize their automation system is wasting energy for months, and when they do notice, the problem shows up as a higher utility bill, not obvious equipment failure. The lights work. The temperature feels fine. The waste is invisible unless you specifically look for it.

The incentives in building design and construction also work against precision. Contractors bid projects competitively, which creates pressure to minimize the time spent on commissioning and programming. The cheaper bid wins the job even if that bid assumes commissioning will take half the time actually needed to do it properly. The building opens on schedule with partially tested control sequences and bugs that will not surface for months.

Maintenance contracts rarely include regular audit and optimization of control strategies. The contract specifies filter changes and equipment inspections, not analysis of whether the scheduling logic still makes sense or whether sensors have drifted out of calibration. These tasks require engineering time rather than technician labor, and engineering time costs more.

Tzadok walked through a building recently where the operating hours had changed three years ago but the automation schedules still reflected the old patterns. The building manager knew about the mismatch. Fixing it meant hiring someone who understood the programming language of their specific automation system and could navigate the control logic without breaking something else. That work had been sitting on the to-do list for 18 months.

The Path Back to Precision

Fixing building automation requires treating it less like a set-and-forget system and more like something that needs regular attention. Tzadok’s father cleaned and oiled watches every few years whether they seemed to need it or not. Buildings need the same kind of preventive care for their control systems.

Better fault detection and diagnostics tools exist now. These systems analyze building performance data and flag when equipment is operating outside expected parameters. They catch problems like the continuously running chiller or the dampers stuck in the wrong position before those problems run up significant energy waste. Only 15 percent of U.S. commercial buildings currently use building automation systems, and many of those systems operate with minimal monitoring or optimization.

The technology improves but the fundamental problem remains: automated systems need human attention to stay accurate. Sensors drift. Building use patterns change. Equipment ages. Someone needs to check regularly that what the automation system thinks is happening matches what is actually happening. The alternative is paying for that inattention through wasted energy and equipment that fails earlier than it should.

A properly programmed and maintained building automation system can reduce energy consumption by 5 to 15 percent in commercial facilities. Those savings come not from better equipment but from using the equipment you already have more intelligently. The precision is available. Most buildings just do not use it.

Tzadok keeps his father’s tools in the basement. Sometimes he takes apart a watch that someone brings him, clean the movement, and put it back together. The work takes three hours and saves someone $300 they would have spent on a replacement. Buildings waste that much in a single day because nobody bothered to check if the systems were still running correctly. The difference is someone cared enough to look inside the watch.