windows AC unit might be leaky and let the outside air enter the conditioned space. This can be good or bad depending on the outside air quality were the fresh air is sourced. Most of these unit have a filtration element in front of the unit that can help reduce the “dust” inside a house. read more
Almost all air conditioners contain a filter that will remove allergens and other pollutants as it pulls air from inside the room. This can actually help reduce indoor air pollution, especially when the air quality outside is poor. read more