Nearly 1 in 10 workers have considered quitting because of office temperature disputes, while 14% admit to secretly changing the thermostat behind their colleagues' backs.
As Britain braces for another summer of soaring temperatures, a different kind of heatwave is sweeping through workplaces across the country.
Outside, temperatures are climbing. Inside, office workers are locked in an ongoing battle over air conditioning controls, open windows and thermostat settings.
One side shivers beneath freezing air conditioning vents. The other sweats beside sun-soaked windows. Somewhere in the middle sits the office thermostat, arguably the most fought-over piece of equipment in the workplace.
What might sound like harmless office banter is having a real impact on productivity, wellbeing and even employee retention. According to our survey of 2,000 UK office workers, temperature tensions are causing workplace arguments,
damaging trust between colleagues and prompting some employees to consider walking away from their jobs altogether.
With the Climate Change Committee warning that the UK is increasingly unprepared for hotter summers and overheating buildings, the humble office thermostat has become part of a much bigger national conversation.
Britain's Offices Are Heating Up Faster Than Workplace Policies
The UK's climate is changing.
The Met Office recorded the UK's highest-ever temperature of 40.3°C in Lincolnshire in July 2022 and has warned that temperatures above 40°C are now becoming increasingly likely as the climate continues to warm. At the same time, the Climate Change Committee has repeatedly warned that much of the UK's building stock was designed for a cooler climate and is ill-equipped to deal with rising temperatures.
Yet despite growing concerns around workplace overheating, there is currently no maximum legal workplace temperature in the UK. According to the Health and Safety Executive (HSE), employers are simply required to maintain a "reasonable" temperature for staff.
That leaves many businesses navigating temperature disputes without clear guidance, and employees feeling either too hot, too cold, or somewhere in between.
Our survey found that:
- 34% say their office is too cold
- 22% say it is too hot
- 18% experience constantly fluctuating temperatures
- Just 26% say their office temperature is 'just right'
In many workplaces, comfort has become a daily lottery depending on where you sit.
Employees stationed beneath air conditioning vents often spend their day wrapped in jumpers and blankets, while colleagues near windows battle stuffy conditions and direct sunlight.
The result? A workplace divided by microclimates.
The Hidden Cost Of Thermostat Wars
For some workers, office temperature isn't simply an inconvenience.
A surprising 9% of workers say they have seriously considered leaving their job because of uncomfortable office temperatures.
Meanwhile, 14% admit to secretly adjusting the thermostat when nobody is looking, while almost half (46%) say they have caught a colleague doing exactly the same thing.
These covert adjustments may seem trivial, but they reveal something deeper.
Workplace culture is built on communication, collaboration and trust. When employees feel unable to discuss something as basic as physical comfort, frustrations often emerge in passive-aggressive behaviours instead.
From opening windows immediately after someone closes them to making stealth adjustments to the air conditioning controls, the office thermostat has become the centre of an ongoing workplace power struggle.
Nearly two-thirds of workers report having argued with a colleague about the office temperature, proving that comfort remains one of the most divisive issues in the modern workplace.
Why Being Too Cold Could Be Hurting Productivity
Temperature disputes are often dismissed as personal preference.
The science suggests otherwise.
Our research found that 2 in 5 workers struggle to concentrate when the office feels too cold.
Research from Cornell University found that employees working in cooler office temperatures made significantly more mistakes and performed tasks less efficiently than those working in warmer environments. When office temperatures increased from around 20°C to 25°C, typing accuracy improved and productivity increased substantially.
Studies from the Harvard T.H. Chan School of Public Health have also highlighted the impact that indoor environmental conditions can have on cognitive performance, concentration and decision-making.
In other words, getting the temperature wrong is not just a comfort issue. It can directly affect how well employees perform throughout the day.
As businesses continue encouraging employees back into the office, ensuring a comfortable working environment may prove just as important as investing in collaboration spaces or workplace perks.
Why Climate Change Is Making Office Comfort More Complicated
Historically, many UK offices were designed to retain heat rather than release it.
That made sense when Britain's biggest workplace complaint was being cold.
Today, things look very different.
The Climate Change Committee has warned that overheating risks will continue to increase across homes, schools and workplaces as global temperatures rise. Without adaptation measures, heat-related health risks are expected to become more common over the coming decades.
At the same time, hybrid working has changed employee expectations.
Workers who can easily control temperatures while working from home often return to offices where comfort is dictated by a single thermostat serving dozens of people with completely different preferences.
The challenge for employers is no longer simply keeping the office warm enough. It is creating an environment that can comfortably support a workforce with varying needs throughout increasingly unpredictable weather conditions.
How Employers Can End The Air Con Wars
Vicki Russell, Head of TX at instantprint, believes communication is the key to avoiding unnecessary workplace conflict.
"Temperature can seem like a small issue until it starts affecting people's comfort, concentration and relationships with colleagues. There is never going to be one perfect setting for everyone, but employers can create environments where people feel listened to and where compromises can be made fairly."
Vicki recommends the following steps:
Ask Employees What They Actually Think
Anonymous surveys can help employers understand how widespread temperature concerns really are and identify problem areas within the office.
Agree A Temperature Range
Rather than constantly adjusting settings, establish a reasonable comfort range that balances different preferences.
Create Clear Ownership
Assign responsibility for managing office temperatures to a designated individual or facilities team rather than allowing constant ad hoc adjustments.
Review Your Office Layout
Desk positioning often contributes to temperature complaints. Moving employees away from direct vents or prolonged sun exposure can significantly improve comfort.
The Future Workplace Needs To Keep Its Cool
Office temperature disputes have always existed, but in 2026 they are becoming harder to ignore.
As Britain experiences hotter summers, rising concerns about workplace overheating and growing expectations around employee wellbeing, comfort is no longer a minor workplace issue.
What starts as an argument over air conditioning often reflects wider concerns around productivity, communication and employee experience.
Because when workers are distracted by freezing temperatures, sweating through meetings or quietly battling for control of the thermostat, nobody is operating at their best.
The businesses that adapt to a warming climate and listen to their employees' needs will not only create happier workplaces, they will be better positioned to attract and retain talent in the years ahead.
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