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temperature drops and rises on a fully charged unit are...at the furnace air handler the return air should drop 18F into the supply air after going across the evap coil and the condenser outside should heat up the days air entering across your legs 10F into you face.the thin Liquid Line should be warm but not supper hot the condenser casing should be super hot in the direct sun like a car hood....but never the LL if it is the condenser might need to be hosed inside out bottom 5 rows....if the charge isn't up to max'd then it will run longer to make the setpoint on that stat the guy that changed the stat sounds like he didn't know how to check a charge....the liquid line is the determining factor on cooling to setpoint if it is gas mixed in anyway off the bottom on that condenser the temp at the air handler willn't be where it should be and results in longer cooling runs on that compressor.....and your wallet.the freon is like air in a tire should always be there..not constanly added to and freon doesn't wear out...