Toronto AC Rental Laws: How to Stay Compliant (And Protect Your Utility Bills)

Summer is officially here, and for landlords in the Greater Toronto Area, the heat isn't just a weather report—it's a massive compliance hurdle.

As of June 1, the City of Toronto’s updated indoor temperature regulations are actively in effect. If you own an apartment building, a rental condo, or a multi-unit townhouse, navigating how to keep your tenants cool while protecting your cash flow has become incredibly tricky.  

Between strict new RentSafeTO cooling requirements and rigid rules from the Ontario Landlord and Tenant Board (LTB) regarding utility surcharges, a simple window AC unit can easily turn into a costly legal dispute.

Here is everything Toronto landlords need to know to stay compliant this summer without watching their hydro bills spiral out of control.

The Core Metric: 26°C

Under Toronto municipal bylaws, if a landlord already provides air conditioning, they must maintain a maximum indoor temperature of 26°C or lower between June 1 and September 30. 1. What If the Tenant Wants to Install Their Own AC?

This is where most independent landlords find themselves in a gray area. If your lease states that utilities are included in the rent, a tenant adding a heavy-duty window air conditioner can instantly erase your monthly profit margin.

According to the Ontario Residential Tenancies Act (RTA), if a tenant wants to install an AC unit:

• Written Notice: The tenant must notify you in writing before installing the unit.  

• Safety First: The installation must be safe, secure, and cause zero structural damage to the window frame or building exterior.

• The Hydro Surcharge: If you (the landlord) pay for the electricity, you are legally allowed to increase the rent to recover the actual or reasonably estimated cost of running that air conditioner.  

  
  

The Catch: This extra charge is strictly seasonal. You must remove the added fee the moment the air conditioner is taken down or stops running in the autumn.  

2. Navigating the RentSafeTO "Cooling Room" Mandate

If you manage an older building or a property that doesn't have central air, you aren't completely off the hook.

Under the latest Toronto bylaws, apartment buildings that do not provide cooling to individual units—but feature a shared indoor amenity space—must ensure that specific amenity space acts as a "cooling room." From June 1 to September 30, that room must be air-conditioned and strictly kept at or below 26°C to provide a safe refuge for tenants during extreme heat waves.  

Failure to monitor and maintain these temperatures can result in heavy municipal fines and a formal audit from RentSafeTO enforcement officers.

3. How to Avoid the "Maintenance Standoff"

With tenant advocacy groups actively hosting workshops on how to fight unauthorized landlord fees, trying to guess what to charge your tenant for hydro is a dangerous game. If you overcharge them by even $20 without proper mathematical justification, they can file a T2 application at the LTB for an illegal rent increase.

To protect yourself, you must follow a clear operational checklist:

• Inspect the Unit: Ensure the window bracket is structurally sound so it doesn't pose a liability hazard to pedestrians below.

• Calculate the Hydro Wisely: Use the energy guide sticker on the tenant’s AC unit (the wattage) and cross-reference it with Toronto Hydro’s current time-of-use rates to create an accurate, transparent monthly cost estimation.

• Put it in Writing: Create a formal amendment to the lease agreement outlining the exact seasonal cost and the dates it will apply.

  
  

Let Turnkey Management Handle the Heat

Trying to keep up with shifting Toronto bylaws, calculating seasonal hydro math, and inspecting window brackets is exhausting—especially if you are trying to manage your rental property dynamically on top of a full-time job.

At Turnkey Rental Management, we ensure your properties are 100% compliant with Toronto’s strict municipal bylaws. For a flat $99/month, we handle tenant communications, verify safe appliance installations, manage utility adjustments legally under the RTA, and protect your building from structural damage.

Don't sweat the new bylaws alone. Contact Turnkey Rental Management today to keep your rental profitable and compliant all summer long.