Two ways to save energy in central air conditioners

There are generally two ways to save energy in central air conditioners. Heat recovery elements use heat recovery elements to recover heat and moisture in fresh air and exhaust air. This form generally appears at the end of the air conditioner.

Heat recovery equipment Taking summer as an example, a set of heat recovery equipment is used to recover the condensation heat on the condenser and provide domestic hot water for the building. This is a relatively common way of central air conditioning energy saving.

Hydrocarbon refrigerant Hydrocarbon is used as a refrigerant. I have never seen it in my life. It should not be particularly commonly used or in the experimental stage.