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Commercial · Car DealershipsCar Dealership HVAC — Showroom & Service Bays
Car dealership HVAC for the showroom and service bays is really two buildings under one roof: a glass-walled showroom that behaves like a greenhouse on a sunny afternoon, and a service department whose overhead doors open all day in January. The showroom runs on rooftop units sized for solar gain through the glass; the bays are heated with infrared tube heaters or unit heaters and ventilated for vehicle exhaust. If one thermostat or one unit is trying to serve both sides, that is the first thing to fix.
A showroom's load comes through the glass, not from the people in it. West and south glazing can push the sales floor into cooling on a bright April afternoon while the offices behind it still call for heat, so the units have to be zoned by exposure and sized from glass area and orientation. Diffusers belong along the perimeter, washing the glass, and high ceilings need returns placed so warm air does not pool above the cars. Because a showroom wants cooling when the outdoor air is already cool, a working economizer does a large share of the job for free; a seized one is covered under rooftop unit economizer repair.
The service department is heated differently because its doors never stay shut. Infrared tube heaters warm the slab, the hoists and the technicians directly, so the bay recovers quickly after a door cycles, where a unit heater warms air that leaves with the next car. Mounting height matters twice: for even coverage on the floor, and because the heater's rated clearance to combustibles has to be met by a vehicle roof with the hoist fully raised.
The service drive loses the most heat per square metre in the building. An air curtain over each door, switched by the door contact, cuts the exchange while the door is open, and door-interlocked heaters fire only when it is needed instead of all day. Inside the bays, tailpipe extraction hoses capture exhaust at the source and general exhaust fans start on carbon monoxide and nitrogen dioxide sensors, the second gas being the one diesel engines produce. Everything those fans remove has to be replaced with tempered air from a make-up air unit, or the shop goes negative and pulls January in under every door.
Dealers rarely buy HVAC on its own. The work usually arrives inside a manufacturer image-program renovation, where the brand's facility standards and the architect's drawings set more glass, a taller showroom and a relocated service drive, all of which change the load. The store cannot close for it. Showroom units are swapped before opening, bays are done a row at a time, and the crane is booked before the lot fills.
Our shop is on North Service Road in Burlington, so dealerships along the QEW corridor are close to home. Independent garages and collision shops with paint booths have different needs and their own page: auto repair and body shop HVAC. For a dealership, the commercial HVAC page explains how quotes and scheduling work, and you can reach the shop here.
Equipment we install and service
Packaged heating and cooling zoned by glass exposure, with economizers and enough dehumidification to keep a showroom of polished cars and tile floors from feeling clammy in July. Sales offices, the customer lounge and the parts counter belong on their own zones.
Gas-fired tube heaters over the service bays and the detail bay, unit heaters in parts storage and other low-traffic rooms. Burner, igniter, pressure switch and reflector condition decide whether a tube heater puts its heat on the floor or into the roof deck.
Air curtains over the service-drive and bay doors wired to the door switch, with heaters staged to run when a door opens. A curtain mounted too high or blowing at the wrong angle does nothing, which is why we check discharge velocity at floor level.
Hose reels or in-floor tailpipe extraction, general exhaust fans, CO and NO2 sensors with their controller, and the gas-fired unit that replaces the exhausted air. Sensors drift and expire; a detection system with dead sensors is a fan that never starts.
What goes wrong in these buildings
- The showroom is 27°C by two in the afternoon and it is only April.
- Sales desks along the glass freeze in January and bake in June.
- Every time the service-drive doors open, the advisors get a blast of winter across the counter.
- Technicians in the end bays work in parkas while the middle bays are fine.
- The shop CO alarm trips on cold mornings when cars are warmed up with the doors down.
- Head office wants the image upgrade finished by fall and we cannot close the service department to do it.
How it works
Showroom and service are surveyed separately: unit ages and zoning on the roof, glass exposure, heater layout and mounting heights in the bays, door cycles, exhaust rates and sensor dates. Sales and fixed-operations managers each get asked where the complaints are.
Zoning, schedules, economizers, door interlocks and the balance between exhaust and make-up air are corrected first. That work is small next to a new rooftop unit and often removes the complaint that started the call.
Crane lifts happen before the store opens, bays are taken out of service one row at a time, and gas shutdowns are booked with the service manager. Renovation scope is priced to the architect's drawings so it can sit inside the image-program budget.
Common questions
Tube heaters or unit heaters for service bays?
Where doors open many times a day, infrared tube heaters are the better fit: they heat the slab, tools and people, and that stored heat is still there after the door closes. Unit heaters cost less to install and suit parts rooms and storage where doors stay shut. Many service departments end up with both, each in the area it suits.
Do we need gas detection in the service department?
Where engines run indoors, the building needs ventilation designed for vehicle exhaust, and CO and NO2 sensors controlling the exhaust fans are the standard way to provide it without running fans flat out all winter. The engineer and the building department set the exact requirement. Whatever is installed needs its sensors calibrated and replaced on the manufacturer's schedule, or it stops protecting anyone.
Can showroom units be replaced without closing the sales floor?
Yes. A rooftop unit swap is roof work: the old unit is lifted off and the new one set on the existing curb or an adapter curb, normally in one morning per unit. We book the crane before opening, keep the lift zone clear of inventory, and do one unit at a time so the showroom is never without conditioning entirely.
Who designs the mechanical for an image-program renovation?
The architect and mechanical engineer retained for the brand program produce the drawings, and those drawings govern. We price them as the mechanical trade, directly or through your general contractor, and flag where existing equipment still has life and could be reused. Catching that before tender is where a dealer saves money on a renovation.
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One licensed team for installs, maintenance contracts and 2 AM calls.