Rooftop Units · Greater Toronto Area

Commercial Rooftop Unit Service in the GTA

Practical repair, maintenance and replacement support for packaged rooftop HVAC units across the Greater Toronto Area.

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Commercial & industrial HVAC support across the Greater Toronto Area.

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Equipment overview

One packaged system, several operating priorities

Packaged rooftop units combine heating, cooling, ventilation and controls in equipment exposed to year-round weather. When an RTU develops a fault, the cause may sit in the airflow path, refrigeration circuit, heating section, economizer, sensors or control sequence. Sensible approaches the unit as a complete system, then explains the immediate repair and any condition that deserves planned follow-up.

Where this equipment is used

Retail plazas and restaurants
Offices and multi-tenant commercial buildings
Warehouses and light-industrial facilities
Schools and community buildings

Packaged rooftop HVAC units on a commercial gravel roof

Signs you need rooftop unit repair

Rising temperature complaints from one zone while others hold
Unusual noise, uneven airflow or short cycling
Filters, belts or bearings failing between scheduled visits
Visible refrigeration-circuit symptoms, or drain paths backing up
Ignition or heating-sequence faults on gas or electric heat
Economizer dampers, sensors or unit-controller alarms that keep returning

Signs you need rooftop unit replacement

Repairs recurring on the same unit rather than resolving
Capacity that no longer meets the occupancy or ventilation the space now has
Cabinet, panel or weather-seal condition that repair no longer holds
Refrigerant availability and cost changing the economics of a major repair
Curb, duct or utility interfaces that limit what repair can achieve
A tenant fit-out that changes the load the unit was sized for

Signs you need rooftop unit preventative maintenance

No pre-season inspection ahead of heating and cooling
Weather exposure, panels and seals with no scheduled check
Filters, coils, drains and dampers left until a complaint arrives
Electrical connections and operating readings not recorded between visits
Control schedules never reviewed against how the space is actually used
Deficiencies logged without separating urgent work from planned recommendations

Schedule Service

How often should rooftop units be serviced?

ANSI/ASHRAE/ACCA Standard 180 sets inspection and maintenance tasks at defined frequencies for commercial rooftop equipment. Most buildings schedule twice a year, before cooling and before heating season, with the interval set by run hours, rooftop exposure and how critical the space below is.

What are the early signs an RTU is heading for failure?

Usually a pattern rather than a single fault: rising complaints from the same zone, unstable temperatures, short cycling, and a work-order list that keeps growing. Individually each looks minor; together they normally mean several components are wearing at once.

Does the refrigerant phase-down affect our rooftop units?

Not their operation. Canada's HFC phase-down reduces supply over time rather than banning equipment, so existing R-410A units keep running with no deadline to replace them. It does affect the repair-or-replace decision when a compressor or coil fails, because recharging becomes more expensive as supply tightens.

Can a rooftop unit be replaced without disrupting the tenant?

Usually, with planning. The work turns on the existing curb, duct, utility and controls interfaces, on crane access and lift timing, and on an agreed window. Business continuity is part of the plan rather than something dealt with on the day.

Why does one zone keep having problems when the others are fine?

That pattern normally points at the unit serving that zone rather than the building as a whole — an economizer damper, a sensor, a controller sequence or an airflow restriction. It is worth diagnosing at the unit before treating it as a distribution or balancing problem.