There are several different air filters out there for the HVAC system! Your air filter can emphasis air quality or just take care of the Heating, Ventilation, and A/C unit. The air conditioner filter can be reusable or disposable. You also can decide what type of material the cooling system filter is made out of. Obviously, all models have benefits and cons. It is up to the homeowner to figure out their home needs. A HEPA filter has smaller holes in it. This means more dust is trapped in the filter before it goes into the Heating, Ventilation, and A/C system. The con is then with the smaller holes, the HEPA filter needs to be changed every two weeks without fail.. It is also more costly than the other air filter models. I recently tried a washable air filter. This filter is meant to be used 2-3 times. The air filter also lasts around a month before you need to clean it. So that means I would get more or less a months worth of work out of a single air filter. I thought I was being so smart with this filter. No, it was not the best filter for air quality or the Heating, Ventilation, and A/C, although I believed that it would work. The main issue I actually had with this filter was the tedious cleaning process. According to the instruction, you take out the filter & scrub it under water. It sounds so easy. The process was way more involved. I had to rip it out of the vent, remove the metal coil, get a special tool to clean it, and then set everything back up again. It took me over an hour to do it!