A disposable air filter just keeps your air conditioner from plugging up with debris. According to the world health organization, the number one killer on earth is upper respiratory infections. The average person spends 90% of the time indoors; and your indoor air is, on the average seven times more polluted than the air outdoors per the US environmental protection agency. A single cubic foot of hot air can contain millions of bacteria, mold, and virus micro organisms-none of which we can see. Ultraviolet air purifiers and electrostatic filters are the only way to eliminate threatening microorganisms, common indoor pollutants and neutralize odors in your home.