hi guys this is a great idea love it i will have to read the technical stuff again cos some of it leaked out my head already an i have learned some things as well an only been in game 20 plus yrs if i may be so bold as to make a small contribution even though most of you are super technical more than me not enough engineers stop and actually look at what there working on an do the stuff i was taught look at it listen to it and feel it there the most important tools we have you can see a design floor in a system and adjust for it you can hear a compressor straining under excessive load and you can feel if an evap is fully wet all the way accross and then ya can break out the super tools to fix it