By Jason Charles Guck, Business Development, Delta Edge CI
Quick-service restaurants are the most energy-intensive buildings most operators will ever run, and the winter months are when that intensity is least visible. Summer makes the problem obvious: the kitchen is hot, the units run constantly, and everyone can feel where the money is going. Winter hides it.
The numbers are worth sitting with. In the 2018 Commercial Buildings Energy Consumption Survey, food service buildings used 263 MBtu per square foot, against 70 for the average commercial building. More than five times the intensity of a typical commercial property, per square foot. A 2,500 square foot restaurant carries the energy profile of a considerably larger office.
What makes winter different is not that consumption rises sharply. It is that the mix changes, and the parts that grow are the parts nobody is watching.
Where the energy actually goes
In the same survey, cooking accounted for 40% of consumption in food service buildings, the highest share of any end use in any building type. Refrigeration was 15%. Space heating was 12%.
That ordering explains why restaurant energy work so often disappoints. Operators reach for the thermostat because that is the control they recognise, and the thermostat governs the third-largest load. Cooking is nearly three and a half times larger, and it runs on a schedule set by habit rather than by demand.
The refrigeration share is also worth noting, because it does not fall in winter. Two-thirds or more of food service buildings have walk-in refrigerators or freezers, commercial ice makers, and refrigerated cases. Those loads run at the same setpoints in January as in July, and in a cold kitchen they compete directly with the heating system.
The drive-thru door and the air you paid to heat
Here is the mechanism that costs the most and appears on no equipment schedule.
A commercial kitchen hood pulls a large volume of air out of the building continuously while it runs. That air has to be replaced, and the replacement comes either from a makeup air unit that heats it deliberately, or through every gap in the envelope, which means it arrives cold and the space heating system deals with it.
The drive-thru window is the largest deliberate gap in a QSR envelope, and in winter it is opening and closing through the entire service period. Each opening admits outside air that the building then conditions. The same is true of a back door propped during a delivery, which is a twenty-minute event several times a day.
None of this shows up as a line item. It shows up as a heating system that runs more than it should, in a building where heating is supposedly only 12% of the load, and staff who report that the front of house is cold while the kitchen is uncomfortable.
Holiday traffic changes the arithmetic
Late in the year, the operating pattern shifts in ways that work against every point above.
Hours extend. Equipment that would normally be staged down stays hot through longer dayparts. Holding cabinets and heat lamps run against unpredictable demand, which in practice means they run continuously because nobody wants to be caught short. Additional units get switched on for peak periods and are rarely switched off afterwards, because the closing routine was written for a normal day.
The pattern is the same in most sites: December consumption per transaction is worse than November’s, and it stays worse into January because the temporary settings became the standing settings.
The winter checklist
Six items, none of which requires capital, in rough order of what they return.
- Audit preheat times against the actual first order. Fryers, grills and ovens are routinely brought up an hour or more before they are needed, because the schedule was set once and never revisited. Compare the recorded start times against the first transaction of the day for a week. In most sites there is a gap, and it repeats 365 times a year on the largest load in the building.
- Stage equipment down between dayparts. A second fryer or a third holding cabinet that is required at noon is usually not required at three. The saving comes from having a written stage-down step, because without one nothing gets switched off.
- Check that the hood is not running at full speed all day. Many hoods run at a single fixed speed from open to close regardless of what is cooking. Where controls allow a reduced speed during low-cooking periods, the saving is both the fan energy and all the heated makeup air the fan was pulling through the building.
- Treat the walk-in door as a discipline, not a fixture. Door seals, closers and strip curtains are cheap and routinely broken or missing. A walk-in that is not sealing is running its compressor against the kitchen, and that runs all year.
- Set and record refrigeration setpoints, then check them monthly. Setpoints drift downward over time as staff respond to a complaint or a delivery, and they rarely drift back. The mechanism, and what it costs, is covered in our post on cold storage setpoint discipline.
- Write a January reset into the calendar now. Whatever was changed for the holiday period gets changed back on a specific date, by a named person, against the list of what was changed. Without that, the seasonal settings become the permanent baseline and next December starts from a worse place.
Why this is worth doing at the portfolio level
For a single restaurant, each item above is a modest saving and easy to dismiss. The case changes with count.
Because these buildings run at more than five times average commercial intensity, a percentage improvement is worth several times what the same percentage is worth in an office. And because QSR sites are near-identical by design, a change that works at one site works at all of them. That is the opposite of most commercial energy work, where every building is its own investigation. The wider cost picture for multi-site operators is covered in our earlier post on QSR chains and rising utility costs.
Brand standards will constrain some of this, and they should. Food safety and service speed are not negotiable against a utility bill. But preheat timing, stage-down routines, door hardware and setpoint discipline sit underneath brand standards rather than against them, and they are where most of the available money is.
Start with preheat times at one site this month. It is the single largest load in the building, on a schedule nobody has checked, and a week of records will tell you whether the rest of the list is worth your time.
If you want that comparison run across a portfolio, with the numbers put against your actual rate structure, that is work we do at Delta Edge CI.