Commercial Lease HVAC Responsibility Toronto: What Tenants and Landlords Need to Know
- 1 day ago
- 6 min read
We get this call more than you'd think
A tenant signs a lease, moves into a strip mall unit in Scarborough or a commercial space in North York, and six months later the rooftop unit stops working. They call us, we come out, and then comes the awkward part — nobody's sure who's actually paying for this.
Sometimes it's obvious. Sometimes it turns into a three-week back-and-forth between a tenant, a landlord, and two lawyers. We've seen both.
The frustrating part is that most of these situations are completely avoidable. Nine times out of ten, the answer is sitting right there in the lease agreement — people just didn't know what to look for when they signed it.
So here's what we've learned from years of working in commercial buildings across the GTA.
It Almost Always Comes Down to the Lease Type
Commercial leases in Ontario aren't one-size-fits-all. The type of lease you have — or the type you're about to sign — determines almost everything about who's responsible for what.
Gross Lease
In a gross lease, the tenant pays one flat monthly number and the landlord handles most of the building's operating costs, HVAC included. You see this more often in older office buildings or smaller spaces where the landlord wants to stay in control of the property.
If you're a tenant in a gross lease, HVAC maintenance is generally not your problem. That said, landlords tend to price gross leases higher to account for that, so you're still paying for it — just indirectly.
Net Lease (and Why the "Triple" Part Matters)
This is where most of the confusion happens.
Net leases come in a few flavours — single net, double net, and triple net — and the differences matter. When it comes to triple net lease HVAC in Ontario, the NNN structure is by far the most common you'll find in GTA commercial plazas, strip malls, and retail units. Under a NNN lease, the tenant is responsible for base rent plus property taxes, building insurance, and maintenance costs.
That last one — maintenance — is where HVAC comes in. In most triple net leases, routine HVAC maintenance and repairs fall squarely on the tenant.
We've met a lot of tenants who didn't realize this when they signed. They assumed the landlord would handle repairs the way a residential landlord would. That's not how commercial leases work in Ontario.
Modified Gross Lease
A modified gross lease is essentially a negotiated middle ground. Some costs go to the landlord, some to the tenant, and which is which depends entirely on what was agreed at signing. If you're in one of these, pull out the lease and read it carefully, because there's no standard answer.
Commercial Lease HVAC Responsibility: Maintenance vs. Capital Replacement
Even when tenants are clearly responsible for HVAC maintenance, there's a distinction that trips people up constantly: the difference between maintaining or repairing a system versus replacing it entirely.
Routine maintenance — filter changes, coil cleaning, belt inspections, seasonal startups — that's tenant territory in most NNN leases. Smaller repairs usually are too.
But what happens when the rooftop unit is simply done? A commercial RTU replacement in the GTA can run anywhere from $15,000 to well over $50,000 depending on the size of the unit and the complexity of the installation. That's not a maintenance cost. That's a capital expenditure, and in most cases it should be the landlord's responsibility.
The problem is that a lot of leases are vague on this point. They'll say the tenant is responsible for maintaining the HVAC system "in good working order" without ever drawing a line between repair and replacement. When the system gives out, that vague language becomes very expensive very fast.
If your lease doesn't clearly define where tenant responsibility ends and landlord responsibility begins, that's something worth addressing before you sign — not after the unit fails in the middle of August.
Before You Sign: What to Actually Look For
We're not lawyers and this isn't legal advice — get a commercial real estate lawyer to review any lease before you sign. But from an HVAC standpoint, here's what matters:
How old is the system? Ask for documentation. If the rooftop unit is 12 years old and you're signing a 5-year lease with maintenance obligations, you may be signing up to pay for the last few years of a dying system. That's a real risk and worth negotiating around.
Get an inspection done before possession. Have a commercial HVAC technician walk through the space before you take possession and put the condition of the system in writing. It takes an hour. If the landlord won't allow it, that tells you something.
What does the lease say about capital replacement? Push for a clause that assigns replacement costs to the landlord, especially if the system is aging. A landlord who's confident in the equipment shouldn't have a problem with this.
Is there a repair threshold? Some leases specify that the tenant handles repairs up to a certain dollar amount — say $1,500 or $2,000 — and anything above that goes back to the landlord. This is a reasonable structure and worth asking for if it's not already in there.
Are there compliance obligations? Ontario's refrigerant regulations are changing. R-410A, the refrigerant used in most commercial systems installed in the last 15 years, is being phased out. If the system needs a refrigerant update during your lease term, who's paying for that? It should be clear.
For Landlords: This Protects You Too
If you own commercial property in the GTA, you already know that HVAC systems are one of your biggest maintenance headaches. Vague lease language doesn't protect you — it just means the dispute is more expensive when it eventually happens.
A few things worth building into your leases:
Require annual preventive maintenance and proof of it. Even in a NNN lease where the tenant is responsible, add a clause requiring them to have the system professionally serviced once a year and to provide documentation. A tenant who defers maintenance on a $45,000 RTU for three years is a problem you'll inherit at lease end.
Document the system's condition before every new tenancy. Get a written inspection report, sign off on it with the tenant, and keep it on file. This single step eliminates most of the "it was already broken when I moved in" disputes.
Think carefully about who controls maintenance. Some landlords keep HVAC maintenance under their own control even in NNN leases, recovering the cost through operating expenses. It costs a bit more to administer, but the system gets properly maintained and you know the work is being done by qualified contractors.
When Things Go Sideways
Commercial lease HVAC responsibility disputes happen all the time in the GTA. Unlike residential tenancies, there's no Landlord and Tenant Board for commercial tenants to turn to. Your options are negotiation, arbitration if the lease provides for it, or civil court — none of which are fast or cheap.
The best outcome is the one you never have to have. A clear lease, a documented handoff, and an HVAC system that gets properly maintained are almost always enough to keep things from escalating.
The Short Version
If you're a tenant: understand your lease type, know whether you're in a NNN situation, get the system inspected before you move in, and budget for ongoing maintenance. Don't assume the landlord will handle it.
If you're a landlord: write clear lease language, require documented annual maintenance, and inspect the system at every tenancy changeover. Vague leases cost more to defend than they save to write.
And if you're not sure where you stand — whether you're pre-lease or already in a space and dealing with an HVAC issue — we're happy to talk it through.
How Burban Air Systems Can Help
We work with commercial tenants, property managers, and building owners across Scarborough, Toronto, and the GTA. If you're taking over a new commercial space and want to know what you're actually inheriting, we can inspect the system and give you a written report before you commit.
We also offer maintenance agreements that align with common lease structures — so if your lease says you're responsible for annual preventive service, we can handle that and provide the documentation your landlord requires.
Pre-lease inspections. Maintenance agreements. Emergency service. If you have questions about a specific situation, reach out to us directly — we'll give you a straight answer.
Burban Air Systems Ltd. is a commercial HVAC contractor based in Scarborough, Ontario, serving businesses across the Greater Toronto Area. This article is for general informational purposes and does not constitute legal advice. Consult a commercial real estate lawyer for guidance specific to your lease.
