The Tranquility 27 Series provides you the MOST energy savings of any space conditioning system available. The advanced two-stage compressor and variable speed fan maximize efficiency while EarthPure Ozone Safe refrigerant provides unprecedented environmental protection. The system is engineered for quiet, efficient operation and comes in multiple capacities and a variety of configurations. Featuring the latest in geothermal heat pump technology, the Tranquility 27 Series delivers comfortable, environmentally responsible heating and cooling plus savings on your utility bills.