Hidden Energy Losses in Commercial Buildings (And How to Fix Them)
Energy waste in commercial buildings rarely announces itself. Here are the culprits we find most often — and what to do about them
When building owners think about energy costs, they tend to focus on the obvious: the utility bill that arrives every month. What they see less clearly is everything driving that number behind the scenes — the systems running when they shouldn’t, the equipment that was never quite set up right, and the building details that have quietly degraded over time.
Energy waste in commercial buildings is rarely dramatic. It accumulates in small, steady increments across dozens of systems and spaces. Which is exactly why it’s so easy to overlook — and why a professional energy audit so frequently uncovers savings that surprised the owner.
HVAC Systems Running on Outdated Schedules
Heating and cooling systems are typically programmed to run on a schedule — on during business hours, reduced or off overnight and on weekends. In practice, those schedules are often never updated after initial setup. Buildings that have changed tenants, shifted operating hours, or expanded their occupied footprint are frequently still running on a schedule set years ago.
The result is conditioning space that doesn’t need it, at times nobody is there. It’s one of the most straightforward issues to fix, and one of the most consistently overlooked.
Simultaneous Heating and Cooling
This one surprises people. It’s possible — and more common than you’d expect — for a building to be actively heating and cooling at the same time in different zones. This typically happens when heating and cooling setpoints overlap, or when individual zone controls aren’t communicating properly with the central system.
The building uses energy on both sides to maintain temperatures that could be achieved with much less effort. A controls review and setpoint adjustment can often resolve this without any capital investment.
“Energy waste in commercial buildings accumulates in small, steady increments. That’s exactly why it’s so easy to miss — and why it adds up so significantly over time.”
Lighting Left On in Unoccupied Areas
Stairwells, storage rooms, parking areas, common corridors — these spaces are often lit continuously, regardless of whether anyone is using them. In buildings without occupancy sensors or daylight controls, lighting runs on a fixed schedule or simply stays on around the clock.
Lighting upgrades to LED, combined with occupancy sensors and daylight harvesting controls, consistently rank among the most cost-effective improvements we identify in energy audits — with payback periods that often fall well within five years.
Domestic Hot Water Systems Working Too Hard
Many buildings maintain domestic hot water at temperatures higher than necessary and circulate it continuously through the building to ensure it’s instantly available at every fixture. In a large building, the energy used just to maintain that circulation loop — the heat lost as water moves through pipes and cools slightly before returning to be reheated — can be substantial.
Temperature setpoint adjustments, improved pipe insulation, and smarter circulation controls can each reduce this load meaningfully, often with minimal capital outlay.
A Leaky Building Envelope
Air leakage is invisible, which makes it easy to underestimate. Gaps around windows, doors, penetrations in the building envelope, and deteriorating weatherstripping all allow conditioned air to escape and unconditioned air to enter — forcing heating and cooling systems to work harder to maintain comfortable temperatures.
Older buildings are particularly susceptible, but even newer construction can have air leakage issues if building practices weren’t closely supervised. An energy audit will often flag high-priority areas for envelope improvement that offer meaningful returns.
Equipment Left in Standby or Running Unnecessarily
Plug loads — the energy consumed by office equipment, kitchen appliances, vending machines, and other plug-in devices — can represent a surprising share of a building’s total electricity consumption. Equipment left on overnight, vending machines running without occupancy controls, and redundant servers or AV equipment all contribute to a baseline load that runs continuously whether the building is occupied or not.
This is one area where operational changes, rather than capital investment, can produce immediate results.
Aging or Oversized Mechanical Equipment
Mechanical equipment that has aged past its peak efficiency — or that was oversized at installation and has never run at its intended operating point — consumes more energy than it needs to in order to deliver the same result. This is a gradual decline that’s easy to miss because the system is still technically functioning.
What we find: During energy audits, we routinely encounter mechanical equipment operating well below its rated efficiency — not because it’s broken, but because it was oversized, is nearing end of life, or hasn’t been maintained to the standard the manufacturer assumed. In these cases, replacement or right-sizing often delivers operating cost savings that make a compelling case on their own.
What to Do About It
The common thread across all of these issues is visibility. Most building owners don’t know these drains exist — not because they’re inattentive, but because the systems involved don’t surface their inefficiencies in any obvious way. A utility bill tells you how much you’re spending; it doesn’t tell you why, or where the waste is happening.
That’s the core value of a professional energy audit. It provides the visibility — and the data — to understand exactly where energy is being lost and what each fix is worth. Some improvements require capital investment. Many don’t. But you can’t act on problems you can’t see.
Curious about what’s hiding in your building? Get in touch with our team to discuss an energy audit — and find out where your energy dollars are actually going.