The best a/c filters to use

The absolulte and only filter any tech would be the cheapest ones avalaible in packs of four or more for less than a dollar each.
These filters give your system the best air flow and protect you system well. The purpose of air filters is to protect the equipment.
If someone in your house has breathing problems or dust is a problem; Spray the filters with a dusting spray which will give it that chemical magnetic power.
All filters should be changed monthly as they become breading ground for dust mites and mold spores. Using cheap filters, changing them monthly is the key.
Having plenty on hand, as they are cheap, makes this the only way to go,for making this an easy task.
A good monthly reminder is when you recieve your electric bill change the filters.
Your a/c system will love you for it!