132 Cartwright Ave, North York ON
Mon–Sat 8am–7pm · Sun 9am–5pm
RTU replacement · costs & sizing
Commercial rooftop replacement
in Toronto — costs & must-knows
Looking for reliable commercial HVAC across Toronto and the Greater Toronto Area? Toronto Air Systems delivers TSSA-licensed assessment, installation, repair, and maintenance from our North York shop at 132 Cartwright Ave — with written quotes, clear options, and equipment sized for real Ontario winters and humid GTA summers.
Replace with eyes open
What really drives rooftop replacement cost in the GTA
Equipment price is only one line on a commercial rooftop replacement. Crane time, curb adapters, gas pipe upsizing, electrical disconnects, duct transitions, economizer options, roof protection, and after-hours labour often move the total more than the difference between two nameplate tons. Toronto Air Systems itemizes those drivers so landlords and operators can compare quotes fairly.
Before you buy like-for-like, confirm the old unit was actually the right size. Replacing a chronically undersized 4-ton with another 4-ton locks in the same summer complaints. We pair replacement planning with load review and a clear repair-versus-replace decision. More on our broader offering at commercial HVAC Toronto.
This article covers typical cost factors, sizing pitfalls, and the questions to ask any GTA contractor — including us — before the crane is booked. For a site-specific number, call 647 953-4252 with photos of the unit data plate and curb.
Toronto and GTA conditions are not mild-climate marketing charts. Design temperatures, humidity, older building stock, and mixed fuel strategies change how commercial HVAC should be specified. We start with how you use the space — occupancy, hours, duct capacity, electrical service, and existing equipment — before recommending parts or a full replacement.
Homeowners, landlords, and facility managers call us when systems short-cycle, ice up, leave rooms uneven, spike utility bills, or fail on the first deep freeze or heat wave. Whether you need a same-week repair or a planned upgrade, we document findings and present repair-versus-replace paths with pricing you can compare.
Explore related hubs for heating, cooling, and commercial HVAC, or ask about rebates and incentives that may apply to high-efficiency equipment. Call 647 953-4252 with model numbers and symptoms so we arrive prepared.
What matters most for commercial HVAC in the GTA
Right sizing, licensed gas/refrigeration work, and commissioning beat the cheapest sticker price. We verify airflow, safety devices, condensate paths, and controls so your system does not fail the first extreme week of the season. Ask us about dual-fuel, zoning, and rebate-eligible models during your quote.
Ask about efficiency incentives on replacement
High-efficiency packaged replacements may qualify for utility or government incentives when specs meet program rules. We check eligibility against your proposed model — start with our rebates & incentives overview.
Key things to know before you replace
- Data plate tons, fuel type, and electrical (photo it)
- Curb dimensions vs proposed cabinet footprint
- Crane access, street permits, and lift window
- Gas line size and regulator capacity for new BTU input
- Disconnect amperage and any panel upgrades needed
- Whether to keep, repair, or upgrade the economizer
- Duct static and supply/return transitions after the swap
- Business-hour constraints and temporary cooling plans
Practical sequence
How we approach commercial HVAC
A structured process so you always know the next step.
01
Consult
Goals & constraints
02
Assess
On-site measurements
03
Compare
Repair vs replace
04
Schedule
Parts & access
05
Execute
Licensed install
06
Verify
Commission & teach
Where this fits
Common commercial HVAC applications in Toronto & the GTA
Different buildings need different equipment paths. These are the scenarios we see most often.
01
Detached & semi-detached homes
Full replacements, dual-fuel strategies, and comfort fixes for older duct systems common across Toronto neighbourhoods.
02
Condos & townhomes
Compact footprints, quiet operation, and board-friendly installs where access and condensate matter.
03
Additions & renovations
Matching new loads without oversizing, including ductless zones where trunks cannot reach.
04
Light commercial
Retail, clinics, offices, and mixed-use spaces that need documented maintenance and predictable uptime.
05
Rental properties
Durable equipment choices, clear landlord options, and service plans that reduce emergency callouts.
06
Efficiency upgrades
High-AFUE / SEER2 / heat-pump paths with rebate paperwork guidance when programs apply.
Step by step
From failed unit to commissioned rooftop
From first call to commissioned equipment, you always know the next step, the timeline, and what is included.
01
Consultation
Tell us about your home or building, symptoms, and goals — by phone or online form.
02
On-site assessment
A licensed technician evaluates your existing rooftop unit, ductwork, and load requirements.
03
Written quote
You receive clear options, pricing, timelines, and rebate notes — no vague estimates.
04
Installation or repair
Our TSSA-licensed team completes the work to code with minimal disruption.
05
Follow-up support
We walk you through operation, warranty, and ongoing maintenance recommendations.
Replacement done right
Commercial rooftop replacement services
Assessment, options, logistics, install, and commissioning — documented for property managers and owners.
Repair vs replace assessment
Honest costing on compressors, heat exchangers, and controls versus a full packaged replacement.
Commercial HVAC Toronto →Right-sized equipment selection
Load-informed tons, efficiency tier, and filtration options matched to occupancy.
Curb adapters & transitions
Adapter curbs and duct work so new cabinets seal and deliver air without shortcuts.
Crane & logistics coordination
Lift planning, roof protection, and scheduling around your tenants and street rules.
Gas & electrical reconnect
Licensed gas piping, proper disconnects, and code-compliant venting/condensate paths.
Commissioning & handoff
Start-up, charge verification, thermostat/BMS checks, and a clear maintenance recommendation.
Request a replacement quote →Related services
Ready to plan your replacement?
We quote replacement cost, tonnage, and timeline in writing before you commit.
01
Commercial HVAC Toronto
Full rooftop replacement and maintenance service across the GTA.
View commercial HVAC →FAQ
Commercial RTU replacement FAQ — Toronto
How much does commercial rooftop unit replacement cost in Toronto?
Totals vary widely with tons, efficiency, curb adapters, crane access, gas/electrical upgrades, and after-hours labour. Small 3–5 ton like-for-like jobs sit in a different band than 6+ ton units needing structural or curb work. We provide a written breakdown after site review rather than a one-number website guess.
What are the biggest cost surprises on RTU replacements?
Crane and street permits, non-standard curb adapters, undersized gas lines, electrical upgrades, duct transitions, and economizer rebuilds. Ask every bidder to address each item explicitly.
Should I replace with the same tonnage?
Only if the original unit was correctly sized and the space use has not changed. Tenant improvements, added kitchen equipment, or heavier occupancy often justify a different capacity. We verify before ordering.
How long is a typical commercial rooftop down during replacement?
Many swaps are completed in a day with a planned lift window. Complex adapters or multi-unit plazas can take longer. We can often stage temporary cooling or schedule overnight for sensitive businesses.
Do I need a building permit for rooftop replacement in Toronto?
Like-for-like mechanical replacements often have lighter permit needs than major capacity or structural changes, but requirements vary by municipality and scope. We flag likely permit items during quoting.
Can you replace only the compressor instead of the whole RTU?
Sometimes — if the cabinet, coils, and heat exchanger are sound and refrigerant/circuit design supports it. On older units with rust, obsolete controls, or repeated failures, full replacement is usually the better spend. We cost both paths.
How do I start a rooftop replacement quote?
Call 647 953-4252 or contact us with the model/serial photo and roof access notes. We schedule a site visit and return a written replacement scope.
How much does commercial HVAC cost in Toronto?
Cost depends on equipment capacity, brand, duct or piping complexity, electrical/gas upgrades, and whether you repair or replace. We provide written quotes after a site assessment so you can compare options fairly. Call 647 953-4252 for a visit.
Do you serve my area in the GTA?
Yes. We are based in North York at 132 Cartwright Ave and regularly serve Toronto, Mississauga, Vaughan, Markham, Scarborough, Etobicoke, Brampton, and nearby communities.
Are your technicians licensed?
Yes. Gas and refrigeration work is performed by TSSA-licensed technicians. We follow Ontario code practice for venting, refrigerant handling, electrical disconnects, and condensate management.
Plan your commercial rooftop replacement with clear numbers
Right size, itemized costs, licensed install — Toronto Air Systems. Call 647 953-4252.