The best ventless air conditioner according to a consumer survey is the Senville Aura 9000. The model has both cooling and heating functions and is so energy efficient that in some U.S. and Canadian regions, the owners receive energy tax credits for installing this unit.
The Senville Aura 2000 uses a seven-stage filtration system that gets rid of 95 percent of particles in the air, such as dust, pollen and smoke. The technology is also efficient enough to filter out airborne bacterium and unpleasant smells. Another advantage of this model is that it is extremely quiet, and even at full capacity, family or guests hardly realize that it is on.