the cooled refrigerant vapor passes through exterior coil 18 where heat from the outdoor air is transferred to the refrigerant passing through exterior coil 18 as mentioned previously this refrigerant passes through heat exchanger 30 where it is used to cool the hot stream of refrigerant from heat exchanger 30 the refrigerant passes back through reversing valve 16 before collecting in accumulator 14 with the operation of the present invention now explained the many advantages offered by the present invention may now be apparent to one that is skilled in the art the reader will note that in both operating modes heat exchanger 30 cools the u201c hot u201d stream of refrigerant before it passes through the thermal expansion valve on a hot day where ambient temperatures are approximately 100 degrees fahrenheit heat exchanger 30 may reduce the temperature of refrigerant flowing through thermal expansion valve 26 from 100 degrees fahrenheit in a conventional system operating without heat exchanger 30 to 40 degrees fahrenheit the temperature of refrigerant fourth port 48 of heat exchanger 30 this reduction in temperature 60 degrees fahrenheit in preceding example dramatically reduces the peak head pressure of heat pump 10 and the workload of compressor 12 the heat pump hvac system of the present invention is able to achieve this reduced head pressure without significantly affecting the system 39 s ability to move heat thus by adding heat exchanger 30 to an existing heat pump system a user is able to attain a higher energy efficiency ratio eer and seasonal energy efficiency.