Carolina Heat Pipe's Patented Split System Thermosyphon Run Around Heat Pipe (TRAHP™) brings a new capability to the use of heat pipe science for energy recovery. By consolidating the performance of multiple heat pipes with interconnecting run-around headers, Carolina Heat Pipe Inc. can transfer heat without location restrictions imposed by conventional heat pipe systems. This TRAHP™ development allows us to provide SPLIT SYSTEM heat pipes for heating, ventilating and air conditioning systems. Now a system designer can stretch, turn, separate and maneuver the heat pipe transfer surfaces to strategically place them where wanted. This new development eliminates earlier conventional heat pipe placement restrictions for multiple bent heat pipes or side-by-side air duct locations. Also because split system TRAHP™ heat transfer surfaces are separated by refrigerant charged headers, the heat transfer process can be controlled with an on-off signal or a modulating signal from a modern control system.