Commercial Rooftop Units (RTUs)

Why Do Rooftop Units Demand Rigorous Follow-Up?

Rooftop units (RTUs) pack a commercial building’s air conditioning, ventilation and often gas heating into a single machine. Exposed to the weather year-round, they foul and drift out of adjustment faster than mechanical-room equipment. A neglected unit consumes more energy, cools poorly at peak hours and eventually fails at the worst possible moment — in the middle of a heat wave or a cold snap.

What Rooftop Unit Services Do We Offer?

• Seasonal preventive maintenance — condenser and evaporator coil cleaning, filter replacement, belt checks, condensate drainage and control parameter verification
• Cooling diagnostics — refrigerant circuit pressure and temperature measurements, leak detection, compressor and fan checks
• Repair — replacement of compressors, fan motors, control boards, sensors and refrigeration components
• Gas heating section — inspection of the heat exchanger, burner and safety devices on combined units, a natural strength of our combustion team
• Equipment replacement — end-of-life assessment, load calculation and commissioning of new units

Why Trust Your Rooftops to a Team That Also Masters Combustion?

Most rooftop units in Greater Montréal combine mechanical cooling with natural gas heating. A team that masters both sides avoids partial diagnostics: the same technician can address a frozen coil in summer and a cracked heat exchanger in winter, and maintenance covers the complete unit rather than half of it.

Which Brands Do We Service?

Montréal Combustion services the leading rooftop unit brands, including Carrier, Lennox, Trane, York and Daikin. Our multi-brand independence guarantees unbiased recommendations when replacement time comes.

Sectors Served

Stores, offices, warehouses, industrial and institutional buildings across Greater Montréal, the North Shore and the South Shore.