Hot summers bring regular queries about the maximum temperatures under which staff and pupils should be expected to work in schools.
Although it is generally accepted that people work best at a temperature between 16°C and 24°C, there are no specific legal maximum working temperatures for schools or for offices or other workplaces. However, there are some sources of legal protection for school staff and pupils:
These legal requirements can be enforced by Health and Safety Executive (HSE) inspectors who may issue legally binding notices to employers obliging them to comply with the requirements.
Clearly, very high temperatures can affect the ability staff and pupils to concentrate and to work effectively, and can cause physical discomfort and illness. If people get too hot, they risk dizziness, fainting, or even epileptic fits or heat cramps. In very hot conditions the body’s blood temperature rises. If the blood temperature rises above 39°C, there is a risk of heat stroke or collapse. Delirium or confusion can occur above 41°C. Blood temperatures at this level can prove fatal and, even if people recover, they may suffer irreparable organ damage.
Even at the lower temperatures likely to be experienced in classrooms, heat still leads to a loss of concentration and increased tiredness, which means that teachers are more likely to put themselves or others at risk. Children, particularly very young ones, are likely to suffer most in extreme heat and may not know how to protect themselves. Although there is no legal maximum temperature in UK law, the World Health Organisation recommends 24°C (75°F) as a maximum for comfortable indoor working, with anything above 26°C as definitely unacceptable.
The TUC has called for a maximum temperature of 30°C, 27°C for those doing strenuous work, although employers should still attempt to reduce temperatures if they exceed 24°C and workers feel uncomfortable.
The NEU believes that because of the nature of the way in which teachers work, and the presence of children, a maximum indoor working temperature of 26°C - lower than the TUC recommendation - is appropriate.
It is important that all schools have in place contingency plans to help staff and pupils cope with the heat. There is little that can be done to alleviate particular problems if schools do not plan in advance and also take note of the weather forecast for the week ahead.
The Workplace Regulations require that a sufficient number of thermometers should be available, at a convenient distance from any part of the workplace, to enable temperatures to be measured in any part of the workplace. They do not require a thermometer to be provided in every room. Alcohol, liquid crystal strips and digital thermometers can lose accuracy over time and should be used as a general guide. The NEU recommends taking several classroom readings with thermometers, including the official school one, before initiating any action.
The HSE’s Approved Code of Practice (ACoP) on the 1992 Workplace Regulations requires employers to take all reasonable steps to achieve a reasonably comfortable temperature.
The ACoP requires workplaces to be ventilated by a sufficient quantity of fresh or purified air. Windows which are intended to be opened to allow natural ventilation should therefore be able to be opened. Where windows are not intended to be opened, there should be an alternative means of artificial ventilation.
The ACoP also states that shade should, where necessary, be provided by window blinds and that special measures such as electric fans or portable air cooling equipment should be provided where necessary.
Schools should implement planned measures to reduce temperatures as soon as staff complain that working conditions are beginning to become uncomfortable or as soon as it is known that temperatures are going to become uncomfortable, according to the weather forecast. If in doubt, 26°C should be used as the trigger for these measures.
Measures that could be considered include the following:
The requirement to take ‘all reasonable steps’ means that employers cannot use cost as an excuse, other than where the measures would be disproportionately expensive.
Again, these legal requirements can be enforced by HSE inspectors who may issue notices to employers obliging them to comply with these requirements.
Other steps may also need to considered such as closing classrooms which are unacceptably hot and teaching classes elsewhere, or even sending pupils home, provided reasonable notice has been given to parents.
It is important not to neglect security issues that will arise when windows and doors are left open, and to consider the risks posed by intruders.
Regulation 6 of the Workplace (Health, Safety and Welfare) Regulations 1992 require that ‘effective and suitable’ provision must be made to ensure that every enclosed workplace is ventilated by a sufficient quantity of fresh or purified air. In Wales, teaching accommodation must be capable of being ventilated at a maximum rate of eight litres of fresh air per second for each of the usual number of people in these areas when they are occupied.
The Government has consistently refused to introduce a maximum working temperature into regulations, in line with the minimum temperature protection. Building Bulletin 101 – Ventilation of School Buildings gives guidance on providing ventilation and avoiding overheating in school buildings.
Where any problems are encountered in schools as a result of high temperature, NEU safety representatives should take these up as a matter of urgency with the head teacher. They should seek to resolve the situation to protect both the health and welfare of staff and pupils and the educational progress of pupils who find it difficult to concentrate in sustained high temperatures.
If any problems arise, such as the head teacher refusing to take the actions outlined in this briefing note, or if adjustments made do not have any significant effect, NEU safety representatives are advised to contact the NEU Adviceline for further advice and assistance.
For more information, please download the full ‘Hot weather and classroom temperature’ guidance.
During the winter months, staff and students will be spending more time indoors. Ventilating indoor work areas, whilst at the same time ensuring a comfortable working temperature, will become more and more challenging.
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