Yes, in Ontario, a landlord is legally permitted to lock the thermostat or control the central heating system remotely in a multi-unit house. However, they are strictly required by municipal by-laws to maintain a minimum room temperature, which is typically 21°C from September to June.
Renting a basement apartment or a unit in a subdivided house in cities like Brampton, Oshawa, or Hamilton often involves sharing utilities and centralized heating systems. A very common source of friction between tenants and landlords is the temperature of the unit. You might prefer your living room to be a balmy 23°C during the winter, while your landlord, trying to keep natural gas bills low, prefers to keep the dial much lower. To prevent tenants from constantly adjusting the heat, some landlords install physical lockboxes over the thermostat or use smart thermostats controlled entirely from their phones. Many tenants feel this is a violation of their rights, but the law looks at this issue through the lens of minimum standards, not personal comfort.
As of May 2026, the Residential Tenancies Act (RTA) does not guarantee a tenant the right to control their own thermostat unless it is specifically written into their lease agreement. The law only mandates that the landlord provides “vital services” and adheres to strict temperature minimums. If the landlord locks the thermostat but ensures your apartment remains at or above the legally required minimum temperature, they are operating perfectly within the law. However, if locking the thermostat causes your unit to become dangerously cold, the landlord is committing a serious provincial offence.
Step-by-Step Process for Dealing with Freezing Rentals
If your landlord has locked the thermostat and your apartment feels like an icebox, you must follow a structured process to force compliance. Verbal arguments will not warm up your apartment; documented evidence will.
Step 1: Check Your Local Municipal By-law
🔍 Heating rules in Ontario are heavily governed by local municipal Property Standards by-laws. For example, in the City of Toronto, landlords must ensure all residential units are heated to a minimum of 21°C from September 15 to June 1. Other cities like Mississauga or Ottawa have similar by-laws (usually mandating between 20°C and 21°C). Check your specific city’s official website to confirm the exact dates and temperatures.
Step 2: Measure and Document the Temperature
Do not just tell your landlord “it feels cold.” Buy a reliable indoor digital thermometer. Place it in the centre of your living room or bedroom, away from drafty windows, exterior doors, or direct sunlight. Take time-stamped photos or videos of the thermometer reading multiple times a day over the course of several days to build a clear record of the violation.
Step 3: Submit a Formal Written Complaint
Send a polite but firm email or text to your landlord. Inform them that the locked thermostat is keeping the unit below the municipal legal minimum (e.g., 18°C instead of 21°C). Request that they adjust the central programming immediately. Keep a copy of this correspondence.
Step 4: Call Municipal By-law Enforcement
If the landlord ignores your written request and leaves you freezing, call your city’s 311 line (or local equivalent) and report a lack of heat. Municipal by-law officers take heating complaints very seriously during the winter. An officer will visit your unit, measure the temperature, and can issue the landlord a direct order and heavy fines if they are breaking the law.
Step 5: File a T20 or T6 Application with the LTB
If the issue persists, you can file an application with the Landlord and Tenant Board. You can file a Form T6 (Maintenance) or a Form T2 (Interference with Reasonable Enjoyment). You can ask the adjudicator for a rent abatement (a partial refund of your rent) for the months you were forced to live in a freezing apartment.
How Much Does it Cost in Ontario?
Forcing a landlord to comply with heating standards is generally a low-cost process for the tenant.
| Action / Expense | Estimated Cost (CAD) |
|---|---|
| Municipal By-law Complaint | $0. Calling 311 for a heat inspection is completely free. |
| Indoor Thermometer | $15 to $30 at any local hardware store. |
| LTB Filing Fee | $53 (often reimbursed by the landlord if you win). |
| Space Heater Operations | Running a 1500W space heater can add $30 to $60+ to your monthly hydro bill. |
How Long Does the Process Take?
Lack of heat is considered an urgent health and safety issue. If you call municipal by-law enforcement during the winter, an officer will typically visit your unit within 24 to 48 hours. If the officer issues an order, the landlord must usually fix the issue immediately. However, if you have to pursue a financial rebate through the LTB, waiting for a hearing date will take 6 to 10 months.
Frequently Asked Questions (FAQ)
Can the landlord turn the heat down at night?
No. The municipal minimum temperature (e.g., 21°C) applies 24 hours a day. The landlord cannot program the smart thermostat to drop to 18°C at midnight just to save money on gas while you sleep.
Can I buy my own space heater?
Yes, you are allowed to use a CSA-approved space heater safely. However, if your lease states that you pay for your own electricity (hydro), running a space heater will cause your bill to skyrocket. You can apply to the LTB to force the landlord to reimburse you for this extra electrical cost.
What if the A/C is locked in the summer?
Ontario does not have a provincial law requiring landlords to provide air conditioning. However, some municipalities (like Toronto) have rules stating that if a landlord does provide central A/C, it must be turned on from June to September and cannot exceed a maximum temperature (usually 26°C).
Is 21 degrees measured at the floor or the ceiling?
By-law officers typically measure the temperature exactly 1.5 metres (about 5 feet) above the floor and exactly in the centre of the room to get the most accurate ambient reading.
Can I break the lockbox myself?
No. Tampering with or breaking a landlord’s lockbox is considered willful property damage. The landlord could serve you with an N5 eviction notice for damaging their equipment. Always use legal channels to complain.
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