Air Conditioners using Freon Gas of R22, is very cheap units, sellers never tell you that these unit is using R22 or other , to sell you at the cheap prices that attract your eyes, but you have to know that the R22 will be phased out, (like the Chlorofluorocarbons gases that was not environmental friendly and proved to cause Ozone damage). and will be replaced by R410 Gas.
The main differences are environmentally friendliness and operating pressures. R410 is nicer for the environment and operated at very high pressures, and also saving your energy using new types of heat-pumps which gives you a high performance unit with less electric energy consumptions. These calls EER and COP factors that you need to look in an A/C unit.
I will describe to you in another note how to select your air condition unit.
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