These units have 2-stage Compressor, ECM Fan & 2" Filter rack. Open loop units have an internal modulating ball valve so no external flow controls are needed. (R-454B refrigerant)

These units have 2-stage compressors & ECM fans. Back up heater to be installed on top of the cabinet. Open loop units have an internal modulating ball valve so no external flow controls are needed.

Residential split-system compressor sections that use R454B refrigerant

These units sit outside so the ground loop connection never enters the building. These units are for closed loop applications only