The Goodman GSX130181 1. 5 ton 13 SEER Air Conditioner with R-410a liquid refrigerant is one of those rare air conditioners that provide efficient cooling performance and last for a very long time as well. Goodman air conditioners are few of the air conditioners that employ the chlorine free liquid refrigerant method, that makes it friendly to the ozone layer in the atmosphere, and the noise performance is considered to be the best by HVAC experts.