Temperature Conditions - Legislation
On this page
What does the legislation state about temperature conditions at work?
Back to topIn some cases, legislation provides a range of acceptable temperatures for specific circumstances. In other cases, occupational health and safety jurisdictions use the Threshold Limit Values® for heat stress or cold stress as published by the American Conference of Governmental Industrial Hygienists (ACGIH). Some Canadian jurisdictions have adopted these TLVs as occupational exposure limits and others use them as guidelines.
What does the legislation require?
Back to topA summary of legislation concerning temperature is provided below. This list does not cite the exact text of each section. In all cases, consult with your jurisdiction to confirm what legislation applies in your situation, and that the most current legislation is applied. Where temperature is not specifically regulated, employers must follow good practices to ensure a safe workplace. Each occupational health and safety jurisdiction in Canada includes a “general duty clause” in its legislation. This clause places a duty on the employer to ensure that the health and safety of the employees are protected while they are working.
A list of contact information for all Canadian occupational health and safety jurisdictions is available.
| Table 1 Canadian health and safety regulations with respect to thermal conditions in the workplace | ||
|---|---|---|
| Jurisdiction | Regulation | Temperature (This list does not cite the exact text of each section |
| Canada, Federal | Canada Occupational Health and Safety Regulations | Section 9.9: personal service room and food preparation area: 18°C minimum/29°C maximum Note: Employment and Social Development Canada has published a guideline titled "Thermal stress in the workplace" which discusses how to apply the Threshold Limit Values® for heat stress or cold stress as published by the American Conference of Governmental Industrial Hygienists (ACGIH) for industrial settings, and Canadian Standards Association (CSA) and American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) standards for thermal comfort and ventilation in indoor offices. |
| National Joint Council (Public Service Canada) | Occupational Health and Safety Directive | Section 2.2 Environmental Conditions: Ideal range between 20-26°C. Temperatures between 17°C and 20°C and above 26°C can be uncomfortable, and occupancy in each of those extremes should not exceed 1 hour daily or 40 hours annually. Humidex 40°C maximum (as measured at workstation) |
| Alberta | Guidelines | Non-regulatory guideline recommends an indoor temperature of 23-28°C in the summer and 20-25°C in the winter when relative humidity is closer to 30% |
| British Columbia | Occupational Health and Safety Regulations | Heat: Sections 7.27 to 7.32: current ACGIH TLVs® Cold: Sections 7.33 to 7.38: current ACGIH TLVs® |
| Manitoba | Workplace Safety and Health Regulation | Section 4.12: Thermal Stress: 2019 ACGIH TLVs® for heat and cold exposure Section 4.13: Thermal Conditions – indoor workplaces: appropriate to work being done |
| New Brunswick | General Regulations | Section 21: In an enclosed place of employment, minimum depends on work being done (e.g., heavy work 12°C; light work 20°C) Section 22: Extremes of Temperature: 2016 ACGIH TLVs® for heat and cold exposure |
| Newfoundland and Labrador | Occupational Health and Safety Regulations | Section 44: Reasonable and consistent with the nature and degree of work performed, as established by current ACGIH TLVs® Section 566: Refuge station to be at minimum 10°C |
| Northwest Territories | Occupational Health and Safety Regulations | Section 74: Thermal conditions. Appropriate to nature of the work, effective protection of worker health and safety, and reasonable thermal comfort |
| Northwest Territories | Mine Health and Safety Regulations | Sections 9.57 to 9.62: Program required when thermal conditions and nature of work can cause distress. 1994-1995 ACGIH TLVs®. |
| Nova Scotia | Workplace Health and Safety Regulation | Section 2.1 and 2.3: current ACGIH TLVs® for heat and cold exposure (physical agents) |
| Nunavut | Occupational Health and Safety Regulations | Section 74: Thermal conditions. Appropriate to nature of the work, effective protection of worker health and safety, and reasonable thermal comfort |
| Nunavut | Mine Health and Safety | Sections 9.57 to 9.62: Program required when thermal conditions and nature of work can cause distress. 1994-1995 ACGIH TLVs®. |
| Ontario | Guidelines | The Ministry of Labour, Training, and Skills Development fact sheet on heat stress refers to the Threshold Limit Values (TLVs) for Heat Stress and Heat Strain published by the American Conference of Governmental Industrial Hygienists (ACGIH). These values are based on preventing workers’ core body temperatures from rising above 38°C. |
| Ontario | Construction Projects Regulations | Section 260(3)(d): Change room for underground workers, 27°C minimum Section 357(7): Medical locks, minimum of 18°C Section 380 (2): Air lock used for people, maximum of 27 °C. Also see Section 384: No work at temperatures greater than 27°C or greater than the temperature at the entrance to the service shaft is above ground;and no work if temperature exceeds 38 °C |
| Ontario | Industrial Establishment Regulations | Section 129. Enclosed workplace, minimum of 18°C. |
| Prince Edward Island | General Regulations | Section 11.10 and 11.11: In an enclosed place of employment, the minimum depends on work being done (e.g., heavy work 12°C; light work 20°C). Exceptions apply. Section 11.9: relative humidity in an office environment must be minimum of 30% Section 42.1: Extremes of temperature - current ACGIH TLVs® for heat and cold exposure |
| Quebec | Regulation respecting occupational health and safety | Sections 116 to 120: Heating Environment – Appropriate temperature considering the work being done. Section 118: Lunch rooms - minimum temperature of 20 °C (but does not apply to facilities used as offices) Sections 121 to 124: Heat Stress Schedule IV: Standards of Temperature in Establishments. Minimum depends on work being done (e.g., heavy work 12°C; light work 20°C) Schedule V: Evaluation of Heat Stress – Outlines work/rest schedule and Wet Bulb-Globe Temperature (WBGT) equations. Section 154: Change rooms - minimum temperature of 20 °C |
| Saskatchewan | Occupational Health and Safety Regulations | Section 6-7: Thermal conditions: Provide and maintain measures to protect workers, and offer reasonable thermal comfort to workers |
| Yukon Territory | Workplace Health and Safety Regulations | Section 5.75: Conditions specific to tower cranes |
| Yukon Territory | Occupational Health Regulations | Section 9: Thermal environment. Reasonable and appropriate to the work performed. Section 12: Heat Stress - maximum depends on work activity and air velocity |
Where can I find more information?
Back to topPlease see the following OSH Answers documents:
- Fact sheet last revised: 2025-02-18
