Portable air conditioner have a few kinds of air filter, including:
Pre-filter: these filters stop larger particles from entering the system. They’re typically washable, but they don’t eliminate smaller particles.
Electrostatic Filter: these filters use electrostatic energy to attract passing particles, but they’re not really considered an efficient means of trapping dust.
Ionisation Filter: these filters purify the air by attaching to and destroying the structure of microbes, like bacteria, viruses and fungi. These filters can help sufferers of allergies and/or asthma.
Carbon Filter: Just as carbon filters absorb pollutants in water purifiers, they also bind to impurities in the air. Once expended, these filters must be replaced, though they are very affordable and usually sold in multi-packs.
Portable air conditioners are not guaranteed to have all of these filters, nor is it a certainty that they will contain a HEPA filter. It wholly depends on whether the product functions as an air conditioner, air purifier, or both. Air conditioners that do contain HEPA filters will be able to catch a larger range of particles, including those of smaller sizes.