If your Toronto apartment is too hot in October, start with a room thermometer and a written request to check the building's heat controls. Toronto's 21°C minimum is not an order to run the boiler when your home is already warm enough.
Safe ventilation or an air conditioner can help while the problem is checked. An expensive cooling mattress is a poor first fix for an uncontrolled radiator. The main catch is that your thermostat may not control the building's seasonal heating and cooling mode.
Don't accept “the calendar says heat must be on” as the whole answer. Don't disable a window safety device to get relief.
Rules and primary guidance checked October 9, 2026. This guide covers ordinary rental-housing questions. Shared homes with an owner and some other arrangements have different legal treatment. Photos illustrate comfort and equipment; they do not identify a building accused of breaking the rules.
Why is the room hot when your thermostat is off?
A thermostat setting is not the same as a room-temperature reading. Sunlight, warm building pipes, heat from neighbouring spaces and a control fault can leave a unit hot even when you aren't asking for heat. Those are possible explanations, not a diagnosis of your apartment.
Two-pipe systems and the seasonal changeover
Many water-based two-pipe systems use the same circulation system for heating or cooling. Management changes the building's mode for the season. Your room control cannot ask that shared system for cold water once it is in heating mode.
A four-pipe system can provide separate heating and cooling arrangements, but the actual equipment and controls matter. Other systems, including ductless heat pumps, work differently again. Ask management what your building has instead of deciding from a thermostat's appearance. Trane's guide to system arrangements
There is no universal October changeover day or rule that every building must switch once nights fall below a certain temperature. Ask for the planned date, the reason and the process for an unusually hot or cold unit. A building-wide changeover does not excuse a broken valve or controller.
Sun-facing rooms need a different plan from a cold back bedroom
Record the hottest time of day and which rooms are affected. A west-facing room can have a different problem from a shaded bedroom in the same building. Closing suitable blinds before strong afternoon sun is more useful than waiting until the room is already hot.
If a room stays hot overnight with its heat control off, ask staff to inspect rather than guessing that all warmth is from the sun. Don't turn communal valves, use a wrench on a radiator or cover hot equipment with a blanket.
What can you do tonight?
Use a safe window opening when outdoor air is cooler and the noise allows it. A fan can move that cooler air, but it doesn't create refrigeration. Don't open a restricted balcony door during construction or bypass a window stopper.
If the room cannot ventilate, tell management that detail. A maintenance request saying “31°C, no usable balcony door during repairs” gives more useful information than “it's like an oven.” The number is an example of how to describe your own measurement, not a temperature we measured in a building.
For a product example, Home Hardware's Home Essentials nine-inch twin window fan, model BP-3-9, showed $39.99 with Hillcrest Home Hardware selected on October 9. That is a displayed price before a checkout, not a stock guarantee or our tested recommendation. Measure your permitted opening and follow the installation instructions. Twin window fan product details
A standing or ceiling fan may suit a room where a window unit cannot safely fit. If street noise stops you opening a bedroom window, consider an earlier cool-down period rather than forcing an overnight opening. Earplugs or white noise are personal comfort choices, not repairs to the heating system.
A safely installed AC can be reasonable in October if its manufacturer's outdoor operating range permits it. A window unit, portable unit and mini-split do not have one shared minimum outdoor temperature. Check your exact manual. Don't copy a 13°C or 18°C figure from a different model.
Not confirmed yet, checked October 9: cooling bedding such as Eight Sleep is a lower-confidence comfort lead for this guide. We have not verified a current Canadian total, required subscription or fit for your bed. Current manufacturer terms would settle those questions. Fix the room controls before paying for a costly workaround.
Radon is a separate indoor-air question. A hot or well-insulated home does not prove a radon problem, and it is not sensible to dismiss the gas as a basement-only issue. Health Canada says testing is the way to establish the level. Health Canada indoor-air guidance
Choose the simplest safe comfort measure while asking for the underlying problem to be checked. A fan or AC bill is not a substitute for a repair plan.
The current rules, without the usual date mix-up
| Rule or issue | Current guidance | What it means for you |
|---|---|---|
| Toronto minimum temperature | 21°C, October 1 to May 15 | Measure the room, not just the thermostat setting |
| Ontario vital-service guidance | Heat, September 1 to June 15; LTB guidance describes 20°C | Do not assume there are no obligations outside the City's 21°C dates |
| Existing landlord-provided air conditioning | Maximum 26°C, June 1 to September 30 under City guidance | This is not a promise of AC in every apartment |
| Qualifying RentSafeTO common cooling rooms | At or below 26°C, June 1 to September 30 | A common room is different from cooling inside your unit |
| Unresolved low or no heat | Tell the landlord; City guidance directs unresolved requests to 311 after 24 hours | Report emergencies immediately through the appropriate emergency service |
Read the City's indoor-temperature guidance and the LTB maintenance and repairs guide together. An old poster in a lobby is not a reliable substitute.
1. Use the new Toronto dates
Older Toronto advice often says September 15 to June 1. The City changed that window. The current local minimum is 21°C from October 1 to May 15 when heat is provided at the property owner’s expense.
If a manager sends you an old link, reply with the current City page. Keep the exchange short and factual. You need a working system and a clear response, not a long argument over who remembered the old rule correctly.
2. Check the actual room temperature
A thermostat can show the temperature you asked for rather than the temperature you have. Setting it to 25°C does not prove the bedroom reached 25°C.
Use a separate room thermometer and record where you put it. Avoid direct sunlight, an open window or a spot right beside a heater, which can give an unhelpful picture of the room. Leave it time to settle. If staff inspect, ask them to explain their measurement and equipment.
3. Do not treat October 1 as an automatic switch-on day
A warm autumn day can keep a home above the required minimum without active heat. In that case, a quiet radiator does not prove a violation.
The useful question is: “Can my home stay at the required temperature?” A building-wide notice saying “heat is on” also proves little if your unit's valve, controls or equipment are broken.
4. Do not dismiss a September complaint
Ontario's vital-service rules have a wider season. The LTB's current guide describes heat from September 1 to June 15 and explains that municipal standards can be higher.
If a cold spell leaves you without adequate heat in September, report it. Ask a community legal clinic which rule and remedy fit your situation. Do not accept “the Toronto date is October” as a complete answer to every rental-heating problem.
Make a report that someone can act on
5. Check simple controls without attempting repairs
Look at the mode, chosen temperature and any visible error message. If the controller uses batteries, check the manual or ask staff whether they need replacing. Keep furniture away from vents and radiators.
Do not remove equipment covers, alter wiring or work on a boiler. A renter should not have to become a heating technician to get a habitable home. TCHC's thermostat guidance explains why the requested setting and the system's behaviour can differ.
6. Check more than one room
A sunny living room can be comfortable while a back bedroom is cold. Record separate readings rather than reporting a single average for the flat.
Include the time, room and whether the system was running. Repeated readings are more useful than a dramatic photo taken beside an open window. Keep your evidence honest and easy to compare.
7. Tell the landlord or property manager in writing
State the address, unit, rooms affected, temperatures and when the problem began. Include a photo of the reading if you have one. Ask for a repair visit and an update.
If you call an emergency maintenance line, follow up by email or a portal message. Write down the time and any ticket number. A short dated record beats trying to reconstruct several phone conversations a week later.
8. Ask for both a repair plan and a temporary plan
“We know about it” is not enough information. Ask what is wrong, who is attending, when the next update will come and what the building will do while you wait.
A response within 24 hours is not the same as a guarantee that every repair will be complete within 24 hours. Nor does a difficult repair erase the duty to respond. Ask for concrete arrangements, especially if someone cannot safely remain in the unit.
Escalate the right way if the problem continues
9. Use 311 for the municipal complaint
The City's heat and vital-services page says to contact your landlord first and use 311 if the issue is not resolved within 24 hours.
Give the same clear facts you sent the landlord. Keep the service-request number. If the problem worsens, update the existing report rather than assuming an old temperature reading tells the whole story. A City response target is not a guaranteed repair time.
10. Keep your landlord involved in a rented condo
In a rented condo, the owner is still your landlord. The City says rented condo units must follow the heat bylaws and directs tenants to their landlord first.
Building management may control the central system, but that is not a reason to send you in circles. Copy the relevant parties on a factual update. Ask who is arranging the repair and when you will hear back. If you own the condo, the tenant process is not automatically your route.
11. Read the building's service notice
RentSafeTO buildings must give tenants information about planned and unplanned disruptions to vital services. Look for what is affected, which units are involved and the expected duration.
Save a photo of the notice. If the stated completion time passes, ask for an updated one. A notice can explain a disruption; it does not by itself show that every obligation has been met.
12. Get legal help for a repeated or serious problem
311 deals with municipal enforcement. The Landlord and Tenant Board deals with tenancy applications and possible remedies. They are different routes and can serve different purposes.
A maintenance issue can involve Form T6. Deliberate interference with a vital service can raise tenant-rights issues. Ask a qualified adviser which facts and application fit. Do not choose a form merely because someone with a different tenancy used it successfully.
Use Legal Aid Ontario's community clinic finder to find an appropriate service. Eligibility and the clinic's service area matter. Keep the complaint number and copies of every reply. That makes a follow-up easier.
Protect your budget and your repair record
13. Keep paying rent unless you have lawful authority to do otherwise
The LTB tells tenants not to withhold rent on their own because of poor maintenance. An unresolved heating problem does not automatically cancel the rent obligation.
You can ask about remedies through the proper process. The Board can make orders in suitable cases, but you should not assume what it will decide. Get advice before turning a repair dispute into a rent-arrears dispute.
14. Keep receipts without assuming reimbursement
Save receipts for reasonable costs caused by the problem. Record what you bought, why and when. If the landlord agrees to pay for something, get the agreement in writing.
A hotel, extra electricity or a heater is not automatically reimbursed in every case. The evidence, necessity, responsibility and legal route matter. Keep the record even if the final answer is not clear yet.
15. Ask who pays for temporary electric heat
If staff provide a portable heater, ask how long it is expected to be needed, how to use it safely and who handles any extra electricity cost. Do not assume “we supplied the heater” answers the whole question.
For a rough energy calculation, a 1,500-watt heater running continuously for four hours uses six kilowatt-hours. Its real cost depends on your electricity plan and bill. That is a calculation example, not a Toronto Hydro quote or a prediction that the heater will run continuously.
16. Make repair access practical
Reply to proposed visits and keep the path to the equipment clear. Ask who is coming and what work is planned. Keep pets and belongings away from the work area.
Ontario has rules about entry and exceptions for emergencies. Do not assume every repair visit needs exactly the same notice. If access becomes a dispute, ask for advice and save the messages rather than blocking all visits while the problem continues.
Temporary comfort, overheating and cooling
17. Use safe temporary heat only
Never use an oven, barbecue or fuel-burning outdoor heater to warm a room. The City's heating-safety guidance warns against these methods.
Keep a suitable portable heater at least one metre from bedding, curtains and other things that burn. Follow the manufacturer's electrical instructions and keep children and pets away. Health Canada says never to plug a portable electric heater into an extension cord or power bar. Electrical product safety A portable heater is a temporary measure, not a proper permanent replacement for the building's heat.
18. Treat urgent danger as urgent
Do not wait for a routine complaint response if there is a fire, a carbon-monoxide alarm or another immediate emergency. Leave danger and contact emergency services as appropriate.
If cold or heat is making someone unwell, get medical help. A temperature that satisfies a general building rule does not answer every person's health or disability need. Ask the landlord for a workable arrangement and seek help with accommodation if needed.
19. Report overheating with measurements too
The answer to a 30°C bedroom is not simply “the heat has to be on.” The 21°C figure is a housing minimum, not a universal ideal sleeping temperature. People have different comfort needs. Toronto's minimum rule does not require unnecessary heating when the home is already warm enough.
Record the room temperature, sunlight, control settings and any inability to turn the heat down. Ask staff to check the system. Do not tamper with communal equipment or remove safety devices. Keep the complaint about your actual conditions, not a guessed diagnosis of the whole building.
20. Separate existing AC from a new right to a cool unit
The City says landlord-provided air conditioning must maintain no more than 26°C from June 1 to September 30. From June 1, 2026, RentSafeTO buildings without cooling that have a suitable existing indoor amenity space must keep that space at or below 26°C from June 1 to September 30. The City states an exception where construction would be required. That is not the same as cooling every apartment.
Those rules are not the same as a guarantee that every rental unit has central AC. The City's July 28, 2026 FAQ says new provincial rules permit tenants to install a window or portable AC when the landlord does not supply cooling, subject to conditions including safe installation. If the landlord supplies the electricity, a seasonal rent increase can apply under the provincial rules. Read the conditions before buying. Current individual AC FAQ
The City's 26°C provided-cooling season ends September 30. An October heat spell does not automatically extend that particular rule. Maintenance, the lease and accommodation needs can still matter. Get advice about the actual problem instead of assuming that one summer number decides every case.
The City's AC FAQ also explains window screens and safety devices, including limits on openings where applicable. A safely fitted AC installation has to maintain the required protection. Don't press down or remove a safety device to force more airflow.
For TCHC tenants, the current RentSafeTO page explains where cooling-room information is posted. For other buildings, ask management for the location, access hours and current arrangements.
A short message for an overheated apartment
Use plain facts. You do not need to threaten a lawsuit in the first message.
Hello. Unit [number] is too hot even with [control setting]. At [time and date], the [room] measured [temperature]°C. The problem began on [date]. We cannot use [window or balcony detail, if relevant]. Please check the heating controls and confirm the temporary plan and next update time. I have attached the readings. Thank you.
For a cold unit, replace 'too hot' with the measured low-temperature problem. If you have already reported it, add the earlier ticket number and date. Keep a copy somewhere you can access outside the building.
| Route | What it does well | Its limit | Our recommendation |
|---|---|---|---|
| Written maintenance request | Starts a clear record and gets staff involved | Can stall without a real plan | First step for a non-emergency |
| 311 complaint | Brings municipal enforcement into the issue | Does not decide every tenancy claim or refund | Use when the problem is unresolved |
| Community legal clinic | Helps identify the right tenancy remedy | Service area and eligibility can limit access | Best next step for a serious or repeated dispute |
| Social-media complaint | Can find neighbours with the same issue | Guesses and public arguments do not fix equipment | Keep it secondary to the actual report |
| Buying more heaters | Can provide temporary comfort in suitable conditions | Added cost and fire risk; does not repair the system | Use only as a safe temporary measure |
We do not give legal processes star ratings. The useful comparison is what each route can actually achieve. Start with a clear request, escalate with the record and seek advice before making expensive decisions.
If heating trouble is one part of a bigger housing problem, the bed-bug and tenant-responsibility guide shows why evidence and the correct reporting route matter across repair issues.
For a longer warm indoor break, see our rainy-day Toronto guide. Our library card guide explains useful public services for Toronto residents. These options help with a difficult day. They do not replace a working heating system.
Frequently asked questions
When does a Toronto landlord have to provide heat?
When heating is supplied at the property owner's expense, Toronto requires a minimum of 21°C from October 1 to May 15. The room can meet that standard without active heat on a warm day. Ontario's separate vital-service guidance also matters outside those dates.
Why is my apartment hot when the thermostat is off?
The building's shared heating mode, warm pipes, sunlight or a control fault can still affect the room. The exact cause needs a building-specific check. Record the room temperature and ask staff to inspect if turning the normal control down doesn't help. Don't alter valves or wiring yourself.
Does my apartment have to stay below 26°C in October?
The City's existing landlord-provided AC rule uses June 1 to September 30. An October warm spell does not automatically extend that seasonal rule. Other maintenance, lease or accommodation questions can still matter. Ask for advice about your actual conditions.
Can I use an air conditioner in October?
Yes, the calendar alone does not make it a bad choice. Use it only within the equipment's operating limits and with a safe installation. Read your exact model's manual, particularly when outdoor temperatures fall. Don't remove window safety devices to fit or ventilate it.
Who is responsible when I rent a condo with building-controlled heat?
The City's guidance says the landlord must ensure the heat bylaw is followed in a rented condo. Tell the landlord even if building management controls the central equipment. Ask the owner to work with management and keep you updated. Condo ownership does not create a blanket exemption from rental-heating duties.
Is a thermostat set to 21°C proof that the room is warm enough?
No. It can show the requested setting rather than the measured temperature. Use a separate room thermometer and record conditions in the affected rooms. Ask staff to inspect if the setting and room reading do not match.
Who can help if the landlord doesn't deal with the problem?
For unresolved low or no heat, the City directs tenants to 311 after reporting to the landlord and waiting 24 hours. Keep the service-request number. For ongoing overheating, describe the controls and measurements and ask which property-standard or tenancy route applies. A community legal clinic can help with a repeated or serious dispute.
Can I stop paying rent because the apartment is too hot or too cold?
Don't withhold rent on your own. The LTB warns against this when maintenance is poor. Keep measurements and receipts, then ask about the correct application or remedy. Compensation and a repair order are not automatic.