As we head into the first major heatwave of June 2026, tenants across the Greater Toronto Area are dragging window air conditioning units out of storage. For property investors, this annual ritual immediately sparks two massive concerns: skyrocketing hydro bills and the terrifying liability of a poorly secured 50-pound appliance dangling out of a third-story window.
If your rental units have inclusive utilities, a single inefficient window AC running 24/7 can quickly erode your monthly cash flow. But before you start sending out emails banning air conditioners or demanding extra money, you need to understand exactly what the Landlord and Tenant Board (LTB) allows.
Here is the legal reality of air conditioning in Ontario for 2026, and how you can protect both your property and your profit margins.
1. The Legal Reality: Is AC a "Vital Service"?
Under the Residential Tenancies Act (RTA), air conditioning is not considered a "vital service" in the same way that heat, hot water, or electricity are. You are not legally required to provide air conditioning to your tenants unless it was explicitly included in the original lease agreement.
However, there is a catch. If you provided central air or a window unit when the tenant moved in, you cannot suddenly remove it or break it without replacing it. It is considered a "service or facility" that is part of their rent.
2. Can You Charge a Seasonal AC Fee?
This is the most common question we get from landlords whose tenants pay "inclusive" rent. The short answer is: Yes, but only if you have the right paperwork.
Under Section 123 of the RTA, a landlord can charge a tenant an extra seasonal fee for the electricity used by an air conditioner. However, you cannot just invent a number and demand it in July. To legally charge this fee, two conditions must be met:
The Lease Clause: Your Ontario Standard Lease (specifically the additional terms/addendums) must explicitly state that there will be a seasonal charge if the tenant chooses to install an AC unit.
Reasonable Cost: The fee must be a reasonable reflection of the actual cost of the electricity. You cannot charge $300 a month for a single window unit as a punitive measure.
If your current lease does not mention an AC fee, you cannot legally force the tenant to pay one this summer. They are entitled to use the electricity included in their rent.
3. Safety First: Can You Ban Window AC Units?
If a tenant installs a window AC unit incorrectly and it falls, damaging property or injuring someone below, the liability nightmare is unimaginable. Furthermore, improper installation often damages window frames, sills, and brickwork.
You can restrict or ban window AC units, but your reasoning must be rooted in safety and property preservation. If a tenant wants to install a unit, you are well within your rights to:
Require Professional Installation: Mandate that any window unit be installed by a licensed and insured professional, at the tenant's expense, to ensure it is structurally safe and doesn't damage the window.
Mandate Portable Floor Units: The safest and most popular solution for modern landlords is to completely ban window units in the lease addendum due to safety and structural concerns, while explicitly allowing the use of portable floor AC units that simply vent out the window without hanging outside the building.
4. How to Protect Yourself for Next Summer
If you are stuck with a bad lease this summer, use it as a learning experience. The key to surviving the GTA rental market is proactive, bulletproof documentation.
Every new lease you sign going forward must include a comprehensive "Air Conditioning Addendum" that clearly outlines:
Whether AC is included or if a specific seasonal fee applies.
A strict prohibition on tenant-installed window units.
The requirement to use only portable, floor-model air conditioners to prevent property damage and liability issues.
Secure Your Leasing Strategy
A standard, out-of-the-box lease isn't enough to protect your asset from the realities of the GTA market. At GTA Landlord, we ensure that every tenant placement comes with airtight, LTB-compliant lease addendums that protect your property from summer heatwave hazards, unauthorized alterations, and unexpected utility spikes.
Don't leave your cash flow to chance. Contact the GTA Landlord team today to ensure your next tenancy is professionally vetted and legally secured.
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