Air conditioning was invented in which country?

American inventor Willis H. Carrier, often credited with inventing the modern electric air conditioning system and starting the industry, was born in 1876 in New England.

Carrie's air conditioning system worked by blowing air through coils of cold tubes to control the temperature and humidity in a room, keeping the paper from changing size and improving print quality. The first air conditioner, designed and built by Carrier, first operated on July 17, 1902.

Willis was a bright boy from a young age. After graduating from Cornell University, he was always attached to research related to temperature.

His first research was a heat-resistant suit that saved his company over $40,000 a year. The summer of 1902 officially marked an important step in Willis's research life.

He became the first person in the world to perfect the air conditioner. Although the first version of the invention was cumbersome, its use made everyone amazed.

With unceasing determination, Willis Carrier continued to improve the cooling system. In 1914, the air conditioner became a household product for the first time in the private home of a notorious gambler in Minneapolis (USA).

According to recorded data, this home air conditioner was more than 2m high, 1.8m wide and nearly 7m long. Even though it was not used because no one lived in the house, the homeowner always had to maintain more than 60,000 USD for maintenance every year.

By 1917, air conditioning became a special way to attract customers to movie theaters across the United States.

In 1922, Willis Carrier continued to make 2 breakthroughs for air conditioning. First, he replaced the toxic refrigerant ammonia with a safer compound, dielene (dichloroethylene). And the next generations of air conditioners were improved by him, reducing the size to make the product significantly more compact.

This improvement helped air conditioners appear in department stores, offices, train cars and even in small houses. Later, air conditioners became more popular and convenient with improvements in functionality.

Now, air conditioners have become a secondary product in many households. Especially important on hot and humid days like today.

According to Kenh14 and Wikipedia