Embodiments of the present invention are related to air conditioner systems and methods. In accordance with one embodiment of the present invention, a system includes at least one emitter electrode and at least one collector electrode that is downstream from the emitter electrode. The emitter electrode has a plurality of pins axially arranged about a center. Preferably, the pins are arranged in a circle about the center. A driver electrode is located within the interior of the collector electrode. Preferably, although not necessarily, the driver electrode is insulated. A high voltage source provides a voltage potential to at least one of the emitter electrode and the collector electrode to thereby provide a potential difference therebetween. The embodiments as described herein have some or all of the advantages of increasing the particle collection efficiency, increasing the rate and/or volume of airflow, reducing arcing, and/or reducing the amount of ozone generated.