According to the TUC should your office temperature hit 30 degrees employees have a right to cease work. I was surprised it was that high. Air conditioning is common place in new UK offices but not older ones. Productivity must slump in hot offices and those arriving from the heat for interviews or meetings must face misery in their damp clothing. So often air con temperature is battleground between those saying it is too cold and those who think its hot. During a heatwave air con peace breaks out. Mind you if you are considering future employers maybe at times like this you need to consider air con as part of the working environment.