I have a major pet peeve when it comes to the air filter of my central HVAC system.
I have to change the air filter at least once a month.
Even if it seems as if it does not need to be changed, I change the air filter of my central HVAC system anyhow. The reason I feel I must do this is because the air quality can benefit highly in your home from it. Having good air quality in your home is legitimately crucial and plays a good part in your indoor comfort. And they way I look at it, because I always buy different brand air filters all of the time (whatever is on sale), you never know the quality of that air filter in terms of lifespan, so I think it is better to be safe than sorry and just change that air filter of the central HVAC system component at least once a month! If you do that no matter how terrible or good the air filters you buy are, it will guarantee that you will always have nice air quality coming out of your central HVAC component without the need of having a whole home air purification system! Of course, keeping your home clean helps air quality as well. But the air filter of your central HVAC system plays a larger part in your indoor air quality than you will even imagine or know!