Commercial HVAC · Toronto & GTA
Commercial rooftop units
installed & serviced across
Toronto & the GTA
TSSA-certified technicians. Fast lead times. Carrier, Lennox, Daikin & more — supply, installation, preventive maintenance, and emergency repair for RTUs on commercial & industrial buildings throughout the Greater Toronto Area.
TSSA-licensed technicians
Emergency service available
All major RTU brands
GTA-wide coverage
At a glance
Service areaToronto & GTA
CertificationTSSA Licensed
Brands serviced10+ major brands
Unit sizes3 – 50+ tons
ResponseEmergency same-day
RebatesAvailable — ask us
1,000+
Commercial clients
10+
Brands carried
TSSA
Certified
7 days
A week support
GTA-wide
Service coverage
About RTUs
What is a commercial rooftop unit?
A rooftop unit (RTU) — sometimes called a packaged rooftop unit or simply a package unit — is a self-contained commercial HVAC system mounted on the roof of a building. Unlike split systems, an RTU houses the compressor, condenser, evaporator, air handler, and controls in a single weatherproof cabinet, making it the dominant choice for retail plazas, office buildings, warehouses, schools, and light-industrial facilities across the Greater Toronto Area.
In a Canadian climate like Toronto's, commercial RTUs must perform reliably from –30 °C January nights to +35 °C summer heat waves. Selecting the right unit — and keeping it properly maintained — directly affects your energy costs, indoor air quality, building comfort, and overall HVAC system lifespan.
Toronto Air Systems has supplied, installed, and serviced commercial rooftop HVAC units throughout Toronto, Mississauga, Brampton, Markham, Vaughan, and the wider GTA for years. Our TSSA-licensed refrigeration and gas technicians are experienced with gas/electric, heat-pump, and economizer-equipped RTU configurations at every commercial scale.
Ontario energy efficiency rebates may apply
Upgrading to a high-efficiency commercial RTU may qualify your business for rebates through the Canada Greener Buildings program or Enbridge Gas. We'll help you navigate available incentives at no extra charge — learn more about rebates.
Common applications
- Retail plazas & strip malls
- Office buildings & medical clinics
- Warehouses & light-industrial
- Schools & community centres
- Restaurants & food service
- Car dealerships & showrooms
- Big-box & grocery retail
- Multi-unit residential common areas
Our RTU services
Everything your commercial rooftop unit needs
From selecting the right unit for your building to keeping it running at peak efficiency for decades, Toronto Air Systems handles the full lifecycle of your commercial RTU.
01
RTU supply & selection
We help you choose the right unit size, configuration (gas/electric, heat pump, economizer), and brand for your building's load requirements, roof structure, and budget — not just whatever's in stock.
Request a consultation →
02
New RTU installation
Full turnkey installation including curb fabrication or adaptation, electrical tie-in, gas line connection, ductwork interface, controls commissioning, and start-up testing. All work to Ontario Building Code and TSSA requirements.
Get an installation quote →
03
RTU replacement
We assess your existing unit and building conditions, recommend the right replacement, handle crane coordination if needed, and ensure a clean changeover with minimal business interruption — often completing smaller replacements in a single day.
Schedule an assessment →
04
Preventive maintenance
Spring and fall PM programs including filter replacement, coil cleaning, belt inspection, refrigerant check, economizer calibration, controls testing, and a full written report. Keeps your warranty valid and your energy bills in check.
Set up a maintenance contract →
05
Emergency repair
RTU failures don't wait for business hours. Our technicians are available 7 days a week and carry a comprehensive van stock of common parts for Carrier, Lennox, York, Trane, Daikin, and other major brands.
Call 647 953-4252 →
06
Controls & BAS integration
We can integrate your RTU with building automation systems (BAS/BMS), install smart thermostats and zone controls, and configure demand-controlled ventilation to maximize comfort and reduce energy waste.
Learn more →
Why Toronto Air Systems
The commercial HVAC partner Toronto businesses trust
Commercial RTUs are a significant investment. Here's why property managers, building owners, and facility managers across the GTA choose us.
01
TSSA-certified refrigeration & gas technicians
All our commercial HVAC technicians hold current TSSA gas technician and refrigeration mechanic licences. You won't be dealing with uncertified subcontractors — every person who touches your equipment is fully qualified and insured.
02
Deep GTA market knowledge
We understand the specific demands of commercial buildings across Toronto, Mississauga, Brampton, Vaughan, Markham, and surrounding municipalities — from flat-roof construction norms to local building permit requirements for HVAC work.
03
Transparent quoting — no surprises
Every commercial RTU quote includes a detailed scope of work, equipment specifications, warranty terms, and a full breakdown of costs. We don't do vague estimates or low-ball quotes followed by change orders.
04
Multi-brand expertise
We're not tied to a single manufacturer. Whether your facility has Carrier, Lennox, York, Trane, Daikin, or another brand, we can service it. And when it's time to replace, we'll recommend the best fit — not the most profitable line for us.
How it works
Our commercial RTU process
From first call to commissioning — here's what working with Toronto Air Systems looks like.
01
Initial consultation
We discuss your building, existing equipment, budget, and timeline — by phone or on-site.
02
Site survey
A senior technician visits to assess the roof, ductwork, electrical, and load requirements.
03
Detailed proposal
You receive a written scope of work, full equipment specs, pricing, and timeline within 48 hours.
04
Installation
Our licensed team handles delivery, crane coordination, installation, and tie-ins to code.
05
Commissioning & handoff
Full start-up testing, controls verification, and a written commissioning report for your records.
Brands we work with
Commercial RTU brands we supply & service
We supply, install, and service rooftop units from every major manufacturer. If your building has an existing unit from any brand, our technicians can service it.
Carrier
Lennox
York
Trane
Daikin
Bosch
Mitsubishi
Nortek
Where we work
Commercial RTU service areas across the GTA
Toronto Air Systems provides commercial rooftop unit installation, replacement, maintenance, and emergency repair across the Greater Toronto Area. Our teams are based in North York and can typically reach any GTA location within a few hours.
Toronto
All neighbourhoods & districts
Mississauga
Including Airport Corporate Centre
Brampton
Industrial & commercial corridors
Vaughan
Including Vaughan Metropolitan Centre
Markham
Tech corridor & retail hubs
Richmond Hill
Office & mixed-use buildings
Pickering & Ajax
East GTA industrial parks
Whitby & Oshawa
Durham Region commercial
Burlington & Oakville
Halton Region properties
Scarborough
East Toronto & Golden Mile
Etobicoke
West Toronto commercial
North York
Our home base
Client reviews
What commercial clients say about us
"Our Carrier RTU failed on the coldest day of the year. Toronto Air Systems had a technician on-site in three hours and the unit was running again by end of day. Outstanding response."
Property Manager, Mississauga retail plaza
"We had three aging RTUs replaced across two buildings in Vaughan. The team was professional, worked around our tenant schedules, and the commissioning report was thorough. Highly recommend."
Facilities Director, Vaughan office complex
"Toronto Air Systems set us up with a bi-annual PM contract for our four RTUs. Since starting the program, we haven't had a single unplanned outage. Worth every penny."
Operations Manager, Markham warehouse
FAQ
Common questions about commercial RTUs in Toronto
How much does a commercial rooftop unit cost to install in Toronto?
Commercial RTU costs in the GTA vary widely based on unit size, configuration, and installation complexity. A small 3–5 ton gas/electric packaged unit for a single retail bay might range from $8,000–$15,000 CAD installed. Larger 15–25 ton units for an office building or industrial facility can run $25,000–$60,000 or more, including crane rental, curb work, and electrical tie-in. We provide detailed written quotes after a site survey — contact us for a no-obligation assessment.
Do I need a permit for RTU replacement in Toronto?
In most cases, yes. Ontario Building Code and municipal requirements in Toronto, Mississauga, Vaughan, and other GTA municipalities typically require building permits for HVAC equipment replacement above a certain size. Gas connections always require TSSA inspection. Toronto Air Systems handles permit applications and inspections as part of our installation service — we won't cut corners on compliance.
How long does a commercial RTU last?
With proper preventive maintenance, a quality commercial rooftop unit should last 15–20 years in the Canadian climate. Units that are neglected — skipping annual PM, running with dirty coils or restricted filters — often fail in under 10 years. The economics of a bi-annual maintenance contract almost always pay for themselves in extended equipment life and avoided emergency repairs alone.
Can an RTU handle both heating and cooling?
Yes — most commercial RTUs installed in Canada are "package" units designed for both heating and cooling. Gas/electric configurations use a natural gas heat exchanger for heating and a DX refrigeration circuit for cooling. Heat pump RTUs are also increasingly popular, providing efficient heating down to about –15 °C and cooling in summer. We can discuss which configuration is most suitable for your building and operating profile.
What size RTU does my commercial building need?
Proper sizing requires a heat load calculation based on the building's floor area, ceiling height, insulation, window-to-wall ratio, occupancy, and internal heat gains (lighting, equipment, etc.). A rough rule of thumb is 1 ton of cooling per 400–500 sq ft of commercial space, but this varies significantly. Undersized units run constantly and fail early; oversized units short-cycle and cause humidity and comfort issues. Our technicians perform Manual N or comparable load calculations to ensure correct sizing.
Are there energy rebates for commercial RTU replacement in Ontario?
Yes — the Canada Greener Buildings Grant and Enbridge Gas saveONenergy programs both have commercial streams that may apply to high-efficiency RTU replacements. Eligibility depends on equipment efficiency ratings, building type, and program availability at the time of installation. Toronto Air Systems will flag applicable rebates during your consultation and provide the documentation you need to apply. Visit our rebates page for current program details.
Do you offer service & maintenance contracts for commercial RTUs?
Yes. We offer annual and multi-year maintenance contracts for commercial clients with one or more RTUs. Contracts include scheduled spring and fall PM visits, priority scheduling for emergency calls, documented service reports, and discounted parts and labour rates. Property managers with multiple buildings can consolidate all units under a single contract for simplified billing and scheduling.
Ready to discuss your commercial RTU project?
Free site survey and written quote. TSSA-licensed technicians. Serving Toronto, Mississauga, Brampton, Vaughan, Markham, and the wider GTA — 7 days a week.
