These and {HEAD ~ other objects} of the present invention are attained by utilizing two four way reversing valves in a refrigerant circuit between {TAIL ~ the inlets} and outlets of the indoor and outdoor coils of the heat pump system 
These and { HEAD ~ other objects } of the present invention are attained by utilizing two four way reversing valves in a refrigerant circuit between { TAIL ~ the inlets } and outlets of the indoor and outdoor coils of the heat pump system
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH