Well little one, P.Ole Fanger was a very smart man who studied how people feel in buildings. He wanted to make sure that people are comfortable in their buildings, like their homes or schools or offices.
He found out that the air in buildings is really important to how people feel. If the air is too hot or too cold or too stuffy, people can feel uncomfortable or even get sick.
So, P.Ole Fanger made a formula to figure out how comfortable people would feel in different buildings based on the air temperature, humidity, and how much air is moving around.
His formula can help architects and engineers design buildings so that people will be happy and healthy inside of them. And that's why P.Ole Fanger is a very important person in making our buildings comfortable places to be!