Are All HVAC Filters the Same? Your heat pump, furnace, or mini-split no doubt comes with a filter, which keeps particulate matter from harming the components. There are different types of filters, though, with a different capacity for doing the job they were made for. Some Filters Have More Surface Area First of all, you should know the difference between the two types of disposable filters: fiberglass and pleated. The pleated kind has a greater surface area than the fiberglass kind thanks to their pleats, or folds, and can last up to 90 days. Fiberglass filters, by contrast, need replacing
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