ACT passive recovery HVAC heat pipe system will provide effective and affordable energy recovery during the hot summer and cold winter months as well as throughout the year.

Advanced Cooling Technologies, Inc. offers a variety of innovative heat pipe HVAC solutions that will take a big bite out of your energy bills and provide a rapid return on your initial investment.

ACT is also an expert in developing a customized passive energy recovery HVAC heat pipe system for your application.


Highlights of an ACT passive energy recovery HVAC heat pipe system include:

  • Energy cost savings over 40%
  • Quick return on investment from energy savings (1-2 Years Typical)
  • Enhanced dehumidification/latent cooling performance
  • Totally passive, no moving parts or system maintenance
  • Eliminates active overcooling and reheating for dehumidification
  • Engineered efficient & compact design

Energy Recovery Heat Exchangers


ACT-HP-WAHX Enhanced Passive Dehumidification with Wrap-Around Heat Pipe Heat Exchangers offer engineered performance to enhance your system’s efficiency and greatly reduce systems’ energy costs.

  • Quick return on investment (under 2 years) from energy savings
  • Enhanced dehumidification by pre-cooling incoming airstreams
  • Totally passive, no moving parts or system maintenance
  • Installing an ACT-HP-WAHX may result in the choice of a smaller AHU
  • Eliminates typical overcooling to dehumidify, plus free passive reheating
    of the buildings entering airstream

ACT-HP-WAHX Wrap-Around systems can be designed for all major AHU OEMs. For retrofitting existing systems, ACT can ship a pre-engineered unit, fully charged and ready to install. ACT offers onsite installation or units can be factory installed. Typical design build/install costs are recouped in a 1-2 year payback period.


ACT-HP-AAHX is a counterflow heat exchanger-energy recovery system features ACT’s high performance, high-reliability heat pipes. Save energy by pre-cooling or pre-heating your incoming building supply air. The system features:

  • Energy cost savings over 40%, cold or hot climatesEnergy recovery heat exchanger
  • No cross-contamination between isolated airstreams
  • Economically Improves Indoor Air Quality
  • Quick return on investment from energy savings
  • Reduce Heating or Cooling Requirements
  • Totally passive, no moving parts or system maintenance
  • Engineered efficient & compact design

ACT-HP- AAHX  Heat Pipe Air-to-Air Heat Exchangers can be fitted to new or existing HVAC system. Systems are sealed to prevent cross-contamination of the side-by-side airstreams. Qualify for LEED and High-Performance Building points with installation payback periods between 1-2 years.

How does a heat pipe heat exchanger work?

Heat pipes are thermal superconductors that use the evaporation and condensation of a refrigerant inside of a closed tube to transfer heat from one end of the closed tube to the other.

As heat is applied to one end of a heat pipe, the liquid refrigerant inside begins to boil converting liquid refrigerant to vapor refrigerant.  The slightly warmer vapor refrigerant is at a higher pressure than the vapor refrigerant at the other end of the heat pipe.  As a result, the pressure difference causes the warmer vapor to move to the lower pressure, cooler end of the pipe.  Here the vapor condenses on the cooler surface giving up the latent heat of vaporization of the refrigerant as it converts back to a liquid.  Finally, the liquid returns to the warmer end by gravity flow for another round of evaporation and condensation.

In a properly sized heat pipe, this process can transfer large quantities of thermal energy (heat) over long distances with practically no temperature difference, typically one or two degrees Fahrenheit,  from end to end.  Therefore, this heat pipe element, or superconductor of heat, can be used to build a superconducting heat exchanger.

Heat pipe heat exchangers start out as conventional tube and fin coils, where each of the tubes is converted into a superconducting heat pipe element.  The warmer air stream passes over one portion of the coil and the cooler air stream passes over the remaining portion of the coil, usually in a counter flow arrangement.  The warm air evaporates the refrigerant on the one side and the cool air condenses the refrigerant on the other side transferring large amounts of heat from one air stream to the other.

ACT has been providing reliable and affordable thermal management solutions since 2003. Learn more about the many ways in which an HVAC heat pipe system for passive energy recovery can lower your energy bills on the company’s website.