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Commercial · Banquet Halls & Event VenuesBanquet Hall & Event Venue HVAC
Banquet hall and event venue HVAC has to serve a room that is empty most of the week and holds several hundred people for five hours on a Saturday. Ventilation follows ASHRAE 62.1, which for a multi-purpose assembly room asks for 2.5 L/s of outdoor air per person plus 0.3 L/s per square metre of floor, and cooling is sized for that full crowd on its feet. The rule we work to: stage the rooftop units so a half-booked hall runs half the equipment, and let a CO2 sensor decide how much outdoor air the room gets.
People are the load in an assembly space. A seated dinner guest gives off roughly the heat of a 100-watt bulb and a dancing one considerably more, and every guest adds moisture as well. Three hundred guests bring heat and humidity at a rate no office or store ever sees, and most of it arrives in the hour between doors and dinner. Because the Ontario Building Code points to ASHRAE 62.1 for ventilation rates, the outdoor air a full hall needs on a humid August evening is a large cooling load in its own right.
Ventilating an empty hall at the full-crowd rate wastes heating gas all winter. Demand-controlled ventilation puts a CO2 sensor in the room or the return duct and opens the outdoor-air damper only as the reading climbs with occupancy, commonly toward a setpoint near 1,000 ppm. On a Tuesday with two staff setting tables the damper sits at its minimum; on Saturday at nine it is wide open. The sensor needs calibration and the damper actuator has to actually move, which on older units it frequently does not; that repair is covered under rooftop unit economizer repair.
A hall with movable partitions is several rooms that sometimes behave as one. Each divisible section should be on its own rooftop unit or zone with its own thermostat, so a 60-person shower in one third of the room does not run equipment for the whole floor. Scheduling does the rest: the units start a few hours before doors to pull the room, the furniture and the walls a couple of degrees below setpoint, because no system catches up once the room is full. Event-by-event schedules are easier on a networked thermostat than a seven-day programmable one, as explained under commercial thermostats and controls.
A unit that fails on a booked Saturday costs more than its repair. We schedule the cooling inspection in April, ahead of wedding season, and the heating inspection in October, ahead of holiday parties, and we recommend keeping a spare belt set, a contactor and a capacitor for each unit in the mechanical room so a common failure is a short visit. Our 24/7 line carries no overtime, weekend or holiday surcharge. The catering kitchen's hood and make-up air need the same pre-season check, since a hood that leaves the hall negative pulls kitchen heat and odour onto the dance floor, a fault described under kitchen exhaust balancing; commercial HVAC covers the rest of our scope, and you can book a pre-season visit now.
Equipment we install and service
Several packaged units over the hall, lobby and kitchen, each with two cooling stages where possible. Compressor staging, coil condition and refrigerant charge are checked under load, since a unit that has lost one stage looks fine in an empty room.
Wall or duct CO2 sensors driving the outdoor-air dampers on each unit. We verify the sensor against a reference, stroke the damper through its range and set minimum and maximum positions for the room's posted occupant load.
The exhaust hood over the cook line and the tempered air that replaces it. The two are interlocked and balanced so the kitchen stays slightly negative to the hall and the hall stays neutral to outdoors.
Entrance heaters, washroom exhaust and small split systems that handle the crush at arrival. Washroom fans sized for a quiet building are overwhelmed at intermission, and upgrading them is a small job next to anything on the roof.
What goes wrong in these buildings
- The hall was 27 °C by the first dance and the family wanted money back.
- We rent the small room on a weeknight and heat the entire building to do it.
- One rooftop unit tripped at six on a Saturday with 250 guests arriving at seven.
- The room is stuffy and people get sleepy during the speeches.
- Cooking smell from the kitchen drifts across the head table.
- Our gas bill in January is the same whether we have four bookings or none.
How it works
We take the posted occupant load of each room, the floor area and the partition layout, and compare them with the cooling capacity and outdoor-air capability on the roof. That shows whether the complaints come from capacity, ventilation or control.
Each unit gets coil cleaning, belts, drains, electrical checks and a run under load before the season starts. Spare belts, contactors and capacitors are tagged by unit and left on site.
Pre-cool and pre-heat start times, CO2 setpoints and unit staging are programmed against your booking pattern. Service visits happen on weekdays when the hall is dark.
Common questions
How early should the air conditioning start before an event?
For a summer evening event, start it by early afternoon so the walls, floor and furniture cool down, and set the room a degree or two below the temperature you want during the event. The exact lead time depends on the building's mass and glazing. A system started when guests arrive will lose ground all night, however large it is.
What happens if a unit fails during an event?
Call our 24/7 line; there is no weekend or holiday surcharge. In the meantime keep exterior doors closed, dim the lighting and set the working units to their lowest setpoint. With spare belts, contactors and capacitors already on site, the most common failures can be repaired in a single visit. We do not promise an arrival time, because it depends on where the technician is.
Is CO2 demand-controlled ventilation worth adding to an existing hall?
Usually, if the rooftop units already have motorized outdoor-air dampers. The hall is empty for most of the hours it is heated, and a fixed damper ventilates for a full crowd the whole time. Adding sensors and a controller costs far less than new equipment. Where the units have fixed manual dampers, an actuator and economizer section must be added first, which changes the price.
Do community centres and church halls need the same setup?
The physics is the same: large rooms, occasional crowds, long empty periods. The difference is budget and booking pattern. A community centre with daily programming gains most from zoning and schedules, while a hall rented a few times a month gains most from deep setback and reliable pre-heat. We quote the control work separately from equipment so a board can approve it in stages.
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