Is there a legal maximum workplace temperature in the UK?

No, there is currently no legal maximum working temperature in the UK. GOV.UK states that during working hours, the temperature in all indoor workplaces must be reasonable. It gives suggested minimum temperatures of 16°C, or 13°C where employees are doing physical work, but there is no equivalent maximum temperature.

That does not mean employers can ignore uncomfortable heat. Businesses still need to manage working conditions properly, including workplace temperature, clean air and ventilation. In simple terms, the law does not say “send everyone home at this temperature”, but it does expect employers to take comfort and safety seriously.

Why does workplace temperature matter?

Anyone who has worked through a hot, stuffy day in an office, workshop, showroom or commercial unit knows how quickly heat affects concentration. Tasks feel harder, meetings drag, customers notice the environment and staff can become tired sooner than usual.

For employers, this is not just about comfort. Temperature can affect morale, productivity, customer experience and health and safety conversations. A reasonable working environment helps people do their jobs properly, which is why more businesses are now looking at fixed air conditioning as a long-term improvement.

What does “reasonable temperature” mean for employers?

Reasonable will depend on the workplace. A comfortable office temperature will not always be the same as a warehouse, gym, kitchen, clinic, retail unit or industrial space. The type of work, number of people, layout, airflow, humidity, sunlight, machinery and glazing can all affect how a room feels.

For example, a first-floor office with large windows may become uncomfortable even when the weather outside is not extreme. A workshop with equipment may build heat throughout the day. A showroom may need a more controlled environment to protect both staff and visitors.

This is where professionally installed air conditioning can make a real difference. A well-designed system helps create a more stable indoor environment, rather than simply reacting when the space is already too hot.

Why are portable fans not always enough?

Fans can be useful for short-term relief, but they do not actually reduce the temperature of the room. In many workplaces, they simply move warm air around. Portable air conditioning units can also be noisy, take up floor space, require window venting and struggle to keep up in larger commercial areas.

Fixed air conditioning is different. It is designed for the space, installed safely and positioned properly. That means no trailing leads, no open windows for vent hoses and no uneven cooling from a temporary unit that was never designed for the room.

Which businesses can benefit from air conditioning?

Air conditioning is useful across a wide range of commercial settings. It is not just for large offices or corporate buildings. Many smaller businesses benefit from a single-room or multi-room installation that improves the areas staff and customers use most.

• Offices and coworking spaces
• Retail units and showrooms
• Clinics, salons and treatment rooms
• Restaurants, cafés and hospitality spaces
• Warehouses with office or welfare areas
• Workshops and light industrial units
• Gyms, studios and leisure facilities
• Server rooms and IT spaces

Why plan your air conditioning before summer?

Many businesses only think about air conditioning when the weather is already hot. By then, demand is higher, diaries are busier and decisions can feel rushed. Planning ahead gives you more time to choose the right system, schedule the work properly and have everything ready before the next warm period arrives.

There is also a year-round benefit. Many modern air conditioning systems are air-to-air heat pumps, which means they can provide heating as well as cooling. For offices, reception areas, garden rooms, training rooms and commercial spaces, this can make them a practical comfort upgrade throughout the year.

Why choose M&E Contrax?

M&E Contrax works with domestic, commercial and industrial clients across the South West, delivering mechanical, electrical, air and renewable services. That wider experience matters because air conditioning is not just about fitting a unit to a wall. It needs to be considered alongside the building, electrical supply, ventilation, day-to-day use and long-term maintenance.

Our team can help you choose a system that suits your workplace, rather than overselling what is not needed. Whether you need cooling for an office, comfort in a customer-facing space or a more efficient year-round option for a commercial area, we can advise on the right approach.