Is there any air intake from outside the house when using air conditioning system?
I heard the air system only recycle and cool the air and not to take fresh air from outside the house. Thus, if we turn on the air all night that has a high accumulation CO2 and we will be sleeping with lack of oxygen and CO2 poisoning or brain cells demag? Similarly, in cold countries when you close all windows and doors and use the radiator, there will be a lack of oxygen at home?
The same as if you're not using any AC device or health. Unless your site is tight, there will be an air intake. In fact, the AC recycles the fresh air inside. The other end of the double fan takes air from outside in order to exhaust the moor abroad again
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