For a shop, an office or a restaurant, the rooftop unit is not really a comfort appliance. It is what allows the business to be open. Nobody eats a hot meal in a hot dining room, staff cannot work in it, and in a food business a failed RTU can escalate into a temperature-control problem rather than just an unpleasant afternoon.
Which is why the timing of RTU failures is so unhelpful. Units fail under load, and load peaks in the first genuinely hot week of the year — the same week every other RTU in the city is also being asked to work hard for the first time in months. That is when demand for repairs peaks, and it is a bad week to be discovering that your unit needed a part.
Most of what fails is unglamorous and is visible in advance. Filters block, and a blocked filter starves the coil and drags efficiency down long before anything breaks. Condenser coils pack with dust and grease — particularly on a restaurant roof, where kitchen exhaust and the condenser share the same air — and a fouled coil cannot reject heat. Belts wear and go slack. Condenser fan motors and their bearings get noisy before they seize. Contactors pit. Condensate pans and drains block, and on a roof that means water finding its way somewhere it should not. Economiser dampers stick, which is invisible in summer and expensive in the shoulder seasons because the unit runs mechanical cooling when it could be using outside air.
None of that is dramatic and all of it is cheaper to catch in April than in July. A pre-season service is essentially a list: filters, coils cleaned, belts and bearings, electrical connections and contactors checked, refrigerant pressures read under load, drain pan and line cleared, dampers and controls proved, and the whole unit run and measured while somebody is standing next to it. Anything about to fail generally announces itself during that.
Access is the other thing worth thinking about before you need it. Getting to a rooftop unit — and getting a replacement one up there — is a real part of the cost and the schedule of any RTU job, and it is much better understood on a calm day than on the afternoon your unit has stopped and your dining room is filling up. If a replacement is ever going to be needed, knowing how it physically gets onto the roof is half the planning.
The scheduling is the easy part. Commercial work can be done overnight or early, before you open, so the service itself does not cost you trading hours. Being open 24 hours a day makes that a normal appointment rather than a favour — and if an RTU does go down mid-service on a Saturday in August, the same thing is true of the repair.
Talk to Xpress HVAC
Tell us what the system is doing. We will tell you plainly what it needs — and if it has failed right now, we are open.