The machine you see outside, with a fan, is outside the air conditioner. The air passing through it is all outside air, but there is no air in the house.
At present, all household air conditioners on the market are return air, that is, the indoor air does not exchange with the outside air, otherwise it will consume a lot of electricity. Think about it, if the air conditioning runs out, it will cost more electricity.
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Excluding the above situation has no effect on your home air. Feng shui or something, I don't understand.
However, the tenant, as the owner, dared to install air conditioning without the consent of the owner and drive out to report to the police. Damn it, you have to have quality as a tenant. I have never done such a shameless thing in my life.