Standard room air conditioners usually do a pretty good job of filtering pollen, ragweed and spores if you keep the coils on the unit clean and replace the filters as frequently as indicated by the manufacturer. Adding an air cleaner. If cleaning, ventilation and routine filter maintenance on existing systems don't provide relief, consider an air cleaner. The finer the media and the greater the surface area, the better it is at trapping small particles.
Electrostatic filters use charged plates that create an electrical field to trap particles.
Hybrid filters use a combination of these technologies. Filter facts . Although a new federal system for testing the efficiency of air filters will be finalized sometime this autumn, many manufacturers are already using it. The rating tells people what the difference is between filters, and takes away a lot of the smoke and mirrors of the manufacturer's claims. Most of these more efficient filters can be used on any forced-air system, but may require some retrofitting.