As an expert in the field of air conditioning, I have witnessed the evolution of terminology used to describe this essential technology. In the United States, the term aircon is commonly used to refer to air conditioning. However, this was not always the case. In the United Kingdom, both air conditioning and aircon are used interchangeably. This is also true in tropical countries like Singapore, where air conditioning is a necessity due to the hot and humid climate.
However, my personal experience has shown that the term air conditioner is more commonly used in Singapore. I grew up in California, where my family moved frequently within and outside of the United States. Despite this, I have always referred to air conditioning as air conditioning. This is in contrast to the accepted answer, which states that aircon is widely used as an abbreviation for air conditioning. When I moved to New York, I was surprised to hear my friends refer to air conditioning as aircon. In fact, they had never even heard of the term air conditioner.
This highlights the regional differences in terminology within the US itself.
