Welcome to ACHP’s documentation!

ACHP is an open source program written to model direct expansion and secondary loops for residential-scale systems.

It was written by Ian Bell, during his time at the Herrick Labs of Purdue University. He can be contacted with any questions or bugs.


  • To download the executable for ACHP, head to ACHP downloads.
  • To download a PDF version of the documentation you see here, click here.

Contents of this website:

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ACHP Graphical User Interface

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