Commercial Rooftop Unit Repair & Maintenance in Calgary: The Complete Guide
If your Calgary business runs on a commercial rooftop unit (RTU), you already know how much rides on that equipment. One failure in January — when temperatures drop to -30°C — can shut down your operations, freeze your pipes, and cost you thousands in emergency repairs. One failure in July, and your staff and customers are sweltering in 35°C heat.
At Next Air, we specialize exclusively in commercial HVAC. We repair, maintain, and replace rooftop units across Calgary and surrounding areas with 1–2 hour emergency response 24 hours a day, 7 days a week. This guide explains everything Calgary business owners need to know to protect their RTU investment.
At Next Air, we specialize exclusively in commercial HVAC. We repair, maintain, and replace rooftop units across Calgary and surrounding areas with 1–2 hour emergency response 24 hours a day, 7 days a week. This guide explains everything Calgary business owners need to know to protect their RTU investment.
What Is a Commercial Rooftop Unit?
A rooftop unit is a self-contained heating and cooling system installed on the flat roofs common to Calgary’s commercial and industrial buildings. Unlike split systems, RTUs house all components — compressor, condenser, evaporator, and air handler — in a single weatherproof cabinet. Our commercial rooftop unit service page covers all brands and sizes we work with.
RTUs are the dominant commercial HVAC solution in Calgary for good reason: they free up interior floor space, simplify maintenance access, and are easily replaceable without disrupting operations inside the building.
RTUs are the dominant commercial HVAC solution in Calgary for good reason: they free up interior floor space, simplify maintenance access, and are easily replaceable without disrupting operations inside the building.
Why Calgary's Climate Is Especially Hard on Rooftop Units
Calgary’s weather is uniquely demanding for commercial HVAC equipment. Here’s what your RTU faces:
- Extreme cold: Temperatures regularly hit -25°C to -35°C in January and February, stressing compressors, refrigerant lines, and heat exchangers beyond the limits of units designed for milder climates.
- Chinook cycles: Calgary’s famous chinook winds can swing temperatures 20–30°C in a matter of hours. These rapid freeze-thaw cycles expand and contract metal components, loosen fittings, and cause microfractures in heat exchangers over time.
- Hailstorms: Calgary is one of Canada’s most hail-prone cities. RTU cabinets, fins, and coils take a beating during summer storms.
- UV exposure: Rooftop units have no shade protection. UV degradation of belts, gaskets, and electrical insulation is accelerated in Calgary’s high-altitude sun.
- Dust and debris: The dry Alberta climate means coils clog faster than in humid regions, reducing efficiency and forcing the system to work harder.
Warning Signs Your Commercial RTU Needs Repair
Catch problems early and you avoid the worst costs. Watch for these indicators:
- Unusual sounds: Banging, squealing, or grinding from the rooftop unit. Banging often signals a loose component; squealing points to a worn belt or bearing.
- Uneven temperatures: Hot or cold spots in your building mean the RTU is struggling to distribute conditioned air evenly — often due to dirty coils, a failing blower motor, or duct leaks.
- Higher-than-usual energy bills: A sudden spike in your utility costs usually means the RTU is working harder to produce the same result. Our commercial energy saving upgrades can help recover efficiency.
- Short cycling: The unit turns on and off repeatedly in short bursts instead of running full cycles. This is hard on the compressor and signals a refrigerant, thermostat, or airflow problem.
- Ice formation on the unit: Ice on your rooftop unit in summer indicates a refrigerant leak or severely restricted airflow from dirty coils or a blocked filter.
- Water leaks inside the building: Condensate drain blockages or refrigerant line insulation failures can cause water damage to your ceiling and walls.
Commercial RTU Maintenance: What's Included and How Often
The Canadian Standards Association recommends at least two scheduled maintenance visits per year for commercial units. Our commercial regular maintenance plans are structured around Calgary’s seasons — one before the heating season (October) and one before the cooling season (April).
A complete Next Air RTU maintenance visit includes:
A complete Next Air RTU maintenance visit includes:
- Coil cleaning (condenser and evaporator) — removing Calgary’s dust and seasonal debris that choke efficiency
- Filter inspection and replacement — critical in Alberta’s dry, dusty environment
- Refrigerant level check and leak detection
- Electrical connection inspection — tightening terminals and checking for corrosion
- Blower motor and belt inspection — especially important before Calgary winters
- Heat exchanger inspection — looking for cracks that can allow combustion gases into your air supply
- Thermostat calibration and controls testing
- Condensate drain flush — preventing the water backups that damage ceilings
- Full system performance report with efficiency readings and any upgrade recommendations
Commercial RTU Repair: Common Failures in Calgary
1. Compressor Failure
The compressor is the heart of your RTU and the most expensive component to replace. Calgary’s extreme cold puts enormous strain on compressors during winter startups. Signs of compressor trouble include warm air from a cooling-mode unit, loud clicking or grinding on startup, and tripped circuit breakers. Our 24/7 commercial emergency repairs team responds within 1–2 hours.
2. Heat Exchanger Cracks
Calgary’s chinook cycles are a leading cause of heat exchanger failure. Hairline cracks allow combustion gases — including carbon monoxide — to enter the building’s air supply. Annual inspection through a preventive maintenance plan is the best way to catch this before it becomes dangerous.
3. Refrigerant Leaks
Refrigerant leaks reduce cooling capacity and, over time, damage the compressor. In Calgary’s extreme temperatures, refrigerant lines and fittings experience significant thermal stress. A system running low on refrigerant will ice up in summer and run continuously without achieving setpoint.
4. Blower Motor and Belt Failures
Blower motors work year-round in a Calgary commercial building, heating in winter and cooling in summer. Motor bearings wear out; belts crack and slip. These are common failures that are easy and inexpensive to prevent with our regular maintenance plans.
5. Ignition and Burner Problems
Cold weather ignition failures are among the most common emergency calls Next Air receives in Calgary winters. A dirty burner, failed igniter, or faulty flame sensor can leave your building without heat. Call commercial emergency repairs any time — we carry common ignition components for same-visit repairs.
RTU Replacement vs. Repair: How to Decide
The general rule: if repair costs exceed 50% of the unit’s remaining value, replacement often makes more financial sense — especially when you factor in the energy savings of a modern high-efficiency RTU. Our commercial system design & installation team can help you evaluate the numbers.
Consider replacement when:
Consider replacement when:
- The unit is over 12–15 years old and requiring frequent repairs
- Energy consumption has increased steadily despite regular maintenance — our commercial energy saving upgrades assessment can quantify potential savings
- The refrigerant type is R-22 (phased out in Canada — parts and refrigerant are increasingly expensive)
- Repair costs are significant relative to the unit’s age and value
NEXT AIR ADVANTAGE
We service all major RTU brands: Carrier, Lennox, York, Daikin, Rheem, Bryant, Keeprite, and more. Our trucks carry a wide inventory of common parts to maximize first-visit fix rates — minimizing your business downtime.
RTU Brands We Service in Calgary
Carrier Commercial HVAC · Lennox Commercial HVAC · York Commercial HVAC · Daikin Commercial HVAC · Rheem HVAC Systems · Bryant HVAC Systems · Keeprite Commercial HVAC · Coleman HVAC Systems · Mitsubishi Commercial HVAC
Emergency RTU Service in Calgary
Commercial HVAC emergencies don’t wait for business hours. Next Air operates 24/7 emergency commercial HVAC service throughout Calgary and surrounding communities including Airdrie, Okotoks, Chestermere, and Cochrane. Our average emergency response time is 1–2 hours. Call us at 587-329-8603 any time.
Book Your RTU Service Today
Don’t wait for a failure. Regular maintenance from Next Air’s certified commercial technicians prevents emergencies, extends equipment life, and keeps your energy bills predictable. Enrol in a maintenance plan or contact us today to book your commercial RTU inspection.