UV light air purifiers use ultraviolet light to kill and inactivate airborne pathogens and microorganisms like mold, bacteria and viruses. As air is forced through the device, it passes UV lamps, which directly attempt to disinfect the air by means of germicidal irradiation. The biggest safety concern is that ozone may be generated during this process. UV light bulbs must be replaced every 1-2 years.
Air ionizers create negative ions using electricity and then discharge them into the air. These negative ions attach to positively charged particles in the room, such as dust, bacteria, pollen, smoke, and other allergens. The positively charged particles and negative ions bond together to create dense dirt particles that cannot float in the air. These heavier dirt particles fall to the ground and wait to be swept up at a later time. Requires no maintenance.
Manufacturer warranties vary per brand and model. 1 year warranty on all labor.