Just had an AmericanStandard installed today, 2.5 ton, vari-speed AH. I'm achieving my setpoint OK, but it seems that my old AC felt colder coming out of the supply.
Question: As a rule of thumb, what's the normal temp drop that installers usually look for? I thought it was between 10 and 20 degrees. If I'm not obtaining the proper temp delta, I'm guessing it'd be a good idea to have the contractor back out to check the charge? Also: I noticed that he didn't consult the super-cooling chart in the setup instructions, and use the 10degree supercooling number written on the condenser.
If you charge until the guages 'look right', you might not charge it properly, correct?