Per quark's attached links, I have had personal experience with the handsdownsoftware psych chart, and it is very user friendly and you can easily plot all the typical air conditioning processes
I must be missing something, joejoedancer. When I go to the handsdown site, I see several downloads - Trane, Carrier, York, marlo, etc. None are identified at version 5.1.2. Am I in the right place?