Filters are very important to protect your Heating & Cooling system investment. Filters must be changed on a regular basis to keep from damaging the Heating, Ventilating, & Air Conditioning (HVAC) system. Standard low efficiency filters come will any HVAC system. You have the choice to upgrade to a filtration system which will capture Dust, Danger, Pollen, Smoke, Odors, and even pathogens like mold, viruses, and bacteria when properly installed.