Guides
Car Wash Winter Throughput: Keeping Bays Open in Alberta
Car wash winter throughput Alberta: bay door timing, glycol floor heat, and air curtains that keep bays above 30 cars/hour at -25°C, even during long cold snaps.
What to take away
- Car wash winter throughput in Alberta means holding 30 cars per hour per bay at -25°C with a 40-second reload window between cars, not merely surviving -10°C.
- Bay door timing and air curtain settings fix more throughput loss than a bigger heater.
- Glycol floor heat matters less than keeping the entrance and exit clear of ice.
- The workaround stops paying off below -30°C or after two frozen-bay mornings in a month.
The hard limit in measurable terms
A prairie cold snap in Alberta can hold at -25°C for five or six hours after sunrise. The concrete floor under an in-bay automatic often sits near -8°C, which is enough for spray mist to freeze before the blower cycle ends. Manitoba operators see the same failure at -20°C because wetter snow loads the entrance mat sooner.
Cold Snap Limits
- -25°Ccold snap temperature
- -8°Cconcrete floor temperature
- 45 secondsmaximum open door time
- 40 secondsfloor refreeze window
This is a hard climate constraint, not a staffing or marketing issue. It rules out open bay doors for more than 45 seconds per cycle. It also rules out unheated bay slabs with no glycol loop if you want 30 cars per hour.
Alberta employment standards set no minimum outdoor temperature for washing vehicles. Each operator decides when bays stay open in a cold snap.
The practical limit is reload time between cars. At -25°C, a wet floor often refreezes in about 40 seconds. If the next car cannot dock cleanly in that window, throughput drops below 20 cars per hour before noon.
What the constraint removes
The hard limit removes the option of running bare floor bays through a real prairie winter. It removes open-door dry cycles longer than one minute. It removes air curtains set below 60 percent output on exposed bays. It removes the idea that a single overhead heater will fix ice at the far end of the bay.
What the Constraint Removes
Removed
- Bay floor
- Bare concrete
- Door cycle
- Open >1 minute
- Air curtain
- Below 60% output
- Heating
- Single overhead heater
Still Possible
- Bay floor
- Heated slab
- Door cycle
- Short cycles
- Air curtain
- 60%+ output
- Heating
- Floor loop + curtain
At -25°C, the entrance mat and the exit tire track freeze before the overhead heat reaches them. The bay floor is the first surface to fail, not the roof.
What still works
You can still hold 30 cars per hour with the right sequence. Short bay door cycles, a low-speed air curtain, and warm floor loops all work together. The car wash itself does not need to change. Baseline throughput expectations from Cars per Hour Benchmarks still hold for in-bay automatics at 30 to 35 cars per hour when the bay stays clear.
Sequence That Holds Throughput
- Keep bay door cycles short
- Run low-speed air curtain
- Maintain warm floor loops
- Keep pad above -2°C
- Hold 30-35 cars per hour
You can also lock in a floor heat loop that runs below the slab. It does not need to warm the floor to the touch. It only has to keep the pad above -2°C while spray runs, which removes most freeze risk without pushing the electrical panel to its limit.
Heating circuit design falls under the National Electrical Code, which covers fixed electric space heating.
The compromises worth making
A compromise that works is cycling the bay door to 40 seconds open, 20 seconds closed, and no more. Another is setting the air curtain to medium output and leaving it on during the wash cycle. A wet pass with heated water, following the sequence in Increase Car Wash Bay Throughput, knocks off salt before it freezes. These are cheap changes you can make in an afternoon.
The floor heat cost in Alberta is modest compared with lost throughput. A single bay floor loop running during the cold hours adds roughly $5 to $8 per day in electricity, a typical operator estimate rather than a metered figure. The real number depends on loop length, the glycol supply temperature, and the local electricity rate.
Do not treat that as a capital budget. Treat it as the cost of keeping the reload window under 40 seconds.
Checklist for a -25°C morning:
-25°C Morning Checklist
- Entrance mat salt-free and dry
- Air curtain set low or medium
- Bay door 40-second open timer
- Automatic close enabled
- Start the glycol loop at least two hours before the first car, so the slab is above -2°C when the doors open.
- Clear the entrance mat and the exit tire track of ice and packed snow.
- Set the bay door to 40 seconds open and 20 seconds closed.
- Set the air curtain to at least 60 percent output.
- Check the blower cycle and the door sensors for frost.
- Clear the entrance apron drain so meltwater reaches the heated catch basin.
The compromises that are not worth it
A compromise that is not worth it is running the floor heat only when the outside air is below -15°C. By then the slab has already dropped near freezing and takes two hours to recover. Another is leaving the overhead doors cracked open to vent mist. That drops bay temperature faster than a closed cycle and does not stop ice at the threshold.
Compromises Not Worth It
Bad Move
- Heat only below -15°C
- Slab already near freezing
- Crack doors to vent
- Drops bay temperature
- Two oversized blowers
- Pushes water to exit
Why It Fails
- Heat only below -15°C
- Two hours to recover
- Crack doors to vent
- Ice at threshold
- Two oversized blowers
- Freezes into ridge
Do not chase the target in Good Cars-Per-Hour Rate by fitting two oversized blowers. The blowers push water to the exit, where it freezes into a ridge. That ridge slows every car behind it. You trade a clean car for a queue that freezes shut.
When to stop and do it properly
Stop the workaround when the overnight low reaches -30°C or the bay floor stays below -12°C for four consecutive hours after sunrise. That is the threshold where door cycling and air curtains no longer hold 30 cars per hour. You also stop when two bays freeze in a month, because the failure is now the slab, not the weather.
Properly fixing it means installing a full glycol floor heat loop in both bays. The entrance apron must drain to a heated catch basin.
A full glycol loop lets you return to Faster Queue Flow without parking half the line on a salted highway. The bay can then run below -35°C if the blower and door sensors stay clear.
