Why is it so hot at work today?

Because it's summer

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Perhaps you're wearing isolating clothes today? Perhaps you're wearing multiple layers? Perhaps it psychological? Perhaps the sun is laying on the building quite hard today? Perhaps the ventilation system isn't working? Perhaps you're doing something physically craving which causes you to become hot? Perhaps there are more people in the local today which warms the place up more than usual? Perhaps the air conditioning isn't working correctly? Perhaps you haven't drunk enough water today?