This is all spot on. The engineering that goes into HVAC systems is under appreciated. When messed up the system that is supposed to give you fresh air can easily become a source of pathogens. You also want filters on ingress and egress (to ensure critters don't have a path into your house), and you want to have a nice fat overdimensioned heat exchanger between the two airstreams to ensure that you're not heating the world instead of your house.
+1 on the rapid change of filters, much better to change a filter frequently even if it is a bit lower performance than to let one sit for too long, but keep an eye on your electricity cost, that is the factor that should decide the quality filter that you purchase and frequently you replace it.
Ground rule: the better the filter, the more it will absorb, the better the chances that something you really don't want lodges there and starts spreading if the filter gets overloaded. Fiberglass filters are a good compromise between energy efficiency and cost, they have excellent working surface compared to their physical size and tend to have a relatively long working life before they 'join the other side' and become a source of contaminants rather than a filter of contaminants.
+1 on the rapid change of filters, much better to change a filter frequently even if it is a bit lower performance than to let one sit for too long, but keep an eye on your electricity cost, that is the factor that should decide the quality filter that you purchase and frequently you replace it.
Ground rule: the better the filter, the more it will absorb, the better the chances that something you really don't want lodges there and starts spreading if the filter gets overloaded. Fiberglass filters are a good compromise between energy efficiency and cost, they have excellent working surface compared to their physical size and tend to have a relatively long working life before they 'join the other side' and become a source of contaminants rather than a filter of contaminants.