Air from AC register

Anyone have a rule of thumb for how cold the air from the register should be? At the present the outside temp is 95 and the air out of the register is 50 deg. This sound about right. Thanks.
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Paul O.
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I've been checking the temperature at the last register to get air for many years (try 27) and it has consistently run between 55-56. I'm no expert but if it runs too cold I think that it may be an indication of low refrigerant. Perhaps someone else can provide a better opinion. MLD
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It depends on the humidity inside the house, the CFM per ton of air flow and the type of metering device (TXV or piston or cap tube) on the indoor coil. Normally it is 16 degrees to 20 degrees below the return temperature in the supply plenum just off the coil. The air will pick up some heat traveling down the duct as well. 55 degrees is good, but if your return temperature is 80 degrees, 60 degree supply air is more likely. If it is very humid, the temperature could be higher still.
Stretch (A/C contractor for 30 years)
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Thanks, appreciate the replies. Guess it's doing ok.
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Paul O.
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This is Turtle.
Well i will tell you what the old rules was as to air temps 30 years ago and today it is very much different.
Home Central air systems the temp will run between 55F to 65F discharge temp.s depending on the temperature of the air in the house and has nothing to do with the temp outdoors.
Trailor houses and other tight space cooling units can run down to 50F to 60F discharge temp.
These are the old ways and the new equipment change these numbers up to a point of these temp maybe different at to being real.
I will say this I really don't like the 50F discharge temp but you need to have your system checked out to see for 50F temp just seems too low for my notion.
TURTLE
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wrote:

The lower than normal temp and the fact that you are spending some effort checking the temp and asking the question seems to indicate you have a problem which you are not telling us. Is your house too hot? Is your vent not blowing as hard as it used to?
JimL
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No problem really, just got a hair to want to check the temp coming out of the register and had no idea what it should be.
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Paul O.
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