Using the best furnace filters can help prevent allergies, by stopping pollen from getting indoors. The size of most pollen ranges from 10 to 100 microns, big enough to be caught by a MERV 11 filter with a 40 to 75 percent efficiency. The best pleated filters fall under MERV 9 to 12, which may be cost a little more, but can be expected to last longer.
As summers grow warmer and drier, the conditions get more and more ideal for pollen production. If you plan to hunker down until the pollen frenzy subsides, make sure your HVAC comes with the most reliable allergy air filters from dealers like Allergy Relief Store.