freon is a temperature pressure creature,so it therefore,can not be defined the way you are trying.....you should always strive to see a 20 degree temp. drop across coil in summer and a 20 degree temp. rise across coil in winter.....again,temperature and pressure effect your supply air temp.,as does the age of system,are the coils clean?,and what type of metering device is in use?,and blower speed tap?...that being said,20 degree rise/drop can not always be attained,but try to get as close to this as possible
I personally find that the higher the SEER the warmer the temp is. Probably from having the large outdoor coil to bring heat in from outside. Also I find that scrolls do a better job of heating in cold weather than recips. I know there is a technical explation but can't recall it. ALSO, make sure blower speeds are set to no more than 400 CFM per ton!