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Ontario bill imposes a 26°C ceiling, planning and reviews to fight extreme heat in schools

Requires boards to plan, equip and respond to extreme heat, and makes the Minister review and publish reports on boards’ progress and gaps.

The Brief

Bill 123 amends the Education Act to force school boards to take defined steps to protect occupants from extreme indoor temperatures during the school day. It sets a maximum indoor temperature standard, requires school-level planning and emergency measures, and gives the Minister of Education a statutory review-and-reporting role.

For professionals: the measure creates operational obligations for boards and transportation providers, will drive capital and maintenance decisions for cooling systems, and elevates provincial oversight through triennial reviews and public reports that will identify gaps and inequities across boards.

At a Glance

What It Does

The bill sets a maximum indoor temperature of 26° Celsius for school buildings and school buses while people are present, requires each board to produce and annually update a heat mitigation strategy and an extreme-temperature emergency plan, and empowers the Minister to review those strategies and publish reports at least once every three years.

Who It Affects

District school boards and school authorities, school transportation operators who run buses under section 190, Joint Health and Safety Committees involved in workplace health, and the Ministry of Education as the reviewer and public reporter. Students, teachers and education workers are the intended beneficiaries.

Why It Matters

This is a prescriptive operational standard tied to planning and oversight rather than an aspirational guideline; it will force boards to prioritize cooling investments and adaptation measures, surface inequities among aging facilities, and create a recurring provincial reporting obligation that can shape funding and policy priorities.

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What This Bill Actually Does

The Act adds new paragraphs to subsection 170(1) of the Education Act that create four distinct board obligations. First, it establishes a ceiling: each school building must be maintained at no higher than 26° Celsius whenever students, teachers, education workers or other workers are present.

Second, the ceiling explicitly covers school buses used for transportation under the Act. Third, boards must develop a school-specific heat mitigation strategy in consultation with the relevant Joint Health and Safety Committees and update those strategies every year.

Fourth, boards must create an extreme-temperature emergency plan for each school that sets out communications and evacuation procedures and other immediate response steps.

The statute specifies what a mitigation strategy must consider: installation and ongoing maintenance of mechanical cooling systems, building and exterior-space adaptations to reduce heat exposure, passive cooling options and practical guidance for staff and families on recognizing and responding to heat stress. The emergency plan requirement draws attention to operational playbooks — who notifies parents, when to relocate students and how to coordinate with local public health or emergency services.The Act adds a new standalone section empowering the Minister to review boards’ heat mitigation strategies.

Reviews must identify gaps and inequities among boards and may be followed by ministerial recommendations. At least once every three years the Minister must publish a report describing each board’s progress toward the temperature ceiling, the gaps or inequities found, and an assessment of each board’s capacity and needs to protect students from extreme heat.

The report must be posted on a government website and laid before the Legislative Assembly.The bill delays coming into force: it becomes effective one year after Royal Assent. The text contains no express enforcement penalties or funding commitments; it focuses on setting a provincial standard, creating planning obligations at the board level, and establishing a provincial review-and-reporting mechanism to expose variation and needs.

The Five Things You Need to Know

1

The temperature ceiling is an operational limit that applies “throughout any period in which students, teachers, education workers or other workers are present” in a building.

2

School buses used as transportation under section 190 are subject to the same 26° Celsius maximum while occupied.

3

Boards must develop heat mitigation strategies in consultation with the applicable Joint Health and Safety Committees and update those strategies annually.

4

The Minister’s statutory review must identify gaps and inequities, may include recommendations to boards, and the resulting report must describe each board’s progress and assess each board’s capacity and needs.

5

The Act’s obligations begin one year after Royal Assent, creating a fixed lead time before boards must comply.

Section-by-Section Breakdown

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Subsection 170(1) — paragraph 8.0.1

Maximum indoor temperature for school buildings

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This paragraph establishes the 26° Celsius ceiling during periods of occupancy. Practically, boards must define how they measure and verify ambient temperatures in classrooms and common areas, and how they respond when temperatures approach or exceed the limit. The provision creates an operational standard without embedding measurement protocol, enforcement mechanics or an exception regime.

Subsection 170(1) — paragraph 8.0.2

Maximum temperature for school buses

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By extending the 26° Celsius ceiling to buses used under section 190, the bill forces operators and boards to consider vehicle HVAC capacity, idling and routing practices, and monitoring during transport. The text does not prescribe monitoring technology, thresholds for re-routing, or who certifies compliance for contracted carriers.

Subsection 170(1) — paragraph 8.0.3

Heat mitigation strategy — content and consultation

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Boards must prepare a school-level strategy in consultation with Joint Health and Safety Committees and refresh it every year. The statute lists required elements — mechanical cooling installation and maintenance, building and exterior adaptations, passive cooling options, and guidance for staff and families — which will push boards into capital planning, procurement and maintenance programs. The consultation requirement brings workplace health representatives into planning, with implications for timelines and collective-agreement processes.

3 more sections▾
Subsection 170(1) — paragraph 8.0.4

Extreme temperature emergency plan

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Boards must also maintain an emergency plan for extreme temperatures that includes communications protocols and evacuation plans. This is an operational mandate: boards will need to define trigger temperatures or conditions, roles and responsibilities during events, and coordination with local authorities. The provision focuses on planning rather than specifying operational triggers or standards for relocation sites.

New section 322

Ministerial review, reporting and identification of gaps

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Section 322 requires the Minister to review boards’ mitigation strategies, identify gaps and inequities, and prepare a public report at least once every three years that describes progress toward the temperature ceiling, the inequities found, and each board’s capacity and needs. The Minister may make recommendations to boards. The section establishes transparency and a provincial diagnostic role but stops short of enforcement mechanisms or tied funding.

Commencement (Section 3)

Delayed commencement — one year after Royal Assent

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The bill takes effect one year after Royal Assent. That lead time gives boards a statutory window to assess facilities, produce strategies and begin planning capital work, but it also compresses timelines for boards with immediate infrastructure shortfalls.

Who Benefits and Who Bears the Cost

Every bill creates winners and losers. Here's who stands to gain and who bears the cost.

Who Benefits

  • Students — Particularly younger children, students with health conditions and those in older buildings; the measures aim to reduce heat-related illness and cognitive impairment during learning hours.
  • Teachers and education workers — Lower indoor temperatures and emergency response plans reduce occupational health risks and clarify roles during heat events.
  • Communities with under-resourced schools — The Minister’s reporting requirement is designed to surface inequities and could inform future provincial support or targeted investments.

Who Bears the Cost

  • School boards — Will likely face capital and operating costs to install, upgrade and maintain mechanical cooling, implement adaptations to buildings and exterior spaces, and staff planning and monitoring efforts.
  • School transportation operators and bus contractors — May need to retrofit buses, change fleets or alter operational practices to meet the on-board temperature ceiling.
  • Ministry of Education and provincial budget — The Ministry assumes an ongoing administrative burden to conduct reviews and publish reports; absent explicit funding in the bill, provincial or board budgets will be pressured to cover upgrades.
  • Joint Health and Safety Committees and school staff — Will carry additional consultative and operational responsibilities to develop and annually update strategies and emergency plans.

Key Issues

The Core Tension

The central dilemma is between setting a uniform, protective standard for indoor temperatures and the absence of accompanying enforcement and funding: the Act demands outcomes and planning that many boards may lack the capital and capacity to deliver, forcing a choice between exposing inequities through reporting or providing immediate, costly upgrades to meet the standard.

The Act sets a clear operational ceiling and prescribes planning and review duties, but it leaves major implementation questions unresolved. It does not define how temperature is to be measured (which thermometer standard, location, averaging period or allowable variance), it contains no enforcement mechanism or penalty for boards that fail to maintain the ceiling, and it includes no funding or provincial cost-sharing commitments.

That combination shifts immediate burdens onto boards while making provincial oversight primarily diagnostic rather than corrective.

There are also practical trade-offs the bill does not squarely address. Many older school buildings cannot accommodate simple retrofits for mechanical cooling without substantial structural work; passive cooling or exterior-space adaptations may be feasible short-term mitigations but will not achieve the ceiling in extreme events.

Extending the standard to buses raises monitoring and liability questions for contracted carriers. Finally, annual strategy updates plus triennial provincial reviews create recurring administrative cycles that will absorb staff time and may compete with other urgent board priorities unless accompanied by resources or technical guidance.

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