Air conditioner
An air conditioner is not a source of cooling but a pump that moves heat from inside the structure to outside where it is unobjectionable.
The theory of operation of these machines is a bit more complicated.
To massively oversimplify, I can change the boiling point of any liquid by changing the pressure on it.
By using a compressor to change pressures I can make refrigerants boil and condense at the temperatures that I want.
When the refrigerant boils at low pressures it absorbs heat from the structure.
Then the refrigerant condenses at high pressures outside the structure releasing the heat it absorbed inside the structure.
Then the cycle repeats.
There are some limitations on what the layman can do involving refrigerants as they cannot be sold to unlicensed persons. MORE INFO
The theory of operation of these machines is a bit more complicated.
To massively oversimplify, I can change the boiling point of any liquid by changing the pressure on it.
By using a compressor to change pressures I can make refrigerants boil and condense at the temperatures that I want.
When the refrigerant boils at low pressures it absorbs heat from the structure.
Then the refrigerant condenses at high pressures outside the structure releasing the heat it absorbed inside the structure.
Then the cycle repeats.
There are some limitations on what the layman can do involving refrigerants as they cannot be sold to unlicensed persons. MORE INFO