I use HEPA whole house air cleaner.  It has one intake vent on one side of house and  a outlet on opposite side. Clean Affects or equal for the system filter. And if you have a return duct you need a 1 inch electronic filter. Just make sure you have enough return size to allow for the thickness of the filter. There is nothing like clean air. Clean air means less medicine for you, less doctor visits for the kids, and you just feel better. If your filter does not catch the dirt you can’t see then your lungs do. Cost of whole house HEPA installed $800, clean affects $800 with system $990 to $1290 filter only.