It could have been fake. I bought it in a Chinese mall after all. 6000 kuai also. But I doubt it, I think it could have just been the stale air in the apartment getting to me, you can’t open the windows when you are using it of course.
A real HVAC with air filtering will circulate air from the outside, so is quite different.
A real HVAC with air filtering will circulate air from the outside, so is quite different.