Air temperature

[town]

what normal temperature is supply and return, 15-20 F, please help

[newoldtech]

It varies depending on humidity. But your 15 to 20 degrees, give or take a couple is pretty accurate.

[town]

if is more of 20 and below of 15 what is that? T/oyu

[newoldtech]

Originally posted by town
if is more of 20 and below of 15 what is that? T/oyu

If its more than twenty you could have airflow issues. If its less than fifteen you could have a refrigeration problem. But other factors such as high humidity can effect the temperature difference. Thats why when troubleshooting a system you have to take many different measurements to determine the problem ie superheat, subcooling, indoor temp, outdoor temp, gauge pressures etc.

[town]

tank very much for you help. You are good man.