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What should the diference in return and supply air temperature be in my home central A/C system be?

I am getting a 21 degree temperature difference between my supply air plenum and return air in my home central A/C system. Is that ok or is it to high.

that's a good differential,it usually runs between 17 and 22 degree difference,to keep the temp difference you have just make sure the evaporator coil is kept clean and a clean filter is in place and the system is properly charged,also keep the outside condenser coil clean,if it's dirty you can put all the freon in you want and it still won't work.if you put your guages on and hook up your high side and low side and your high side pressure is running 300psig on the white scale or more and your low side is running at about 70psig on the white scale then your condenser coil is dirty,shut it down and turn the electric off to it and take a garden hose and turn in on high pressure and blow out the coil to clean it and if it's too dirty you can purchase a acid or foaming coil cleaner and sprayer jug start at the top and go across the top of the coil and working your way down to the bottom,you will see all the dug in dirt start to come out as it foams up,do all three sides the same way,let it stand for 15 minutes and then blow it out with a garden hose,when you have rinsed all three sides ,let stand to drain for a few minutes then stand back and turn it on,when all the water stops coming out from the fan look at your guages,you will find you are under charged.if everything is working correctly and the coils are clean you should be getting readings like 70lbs psig on your low side thats the outer scale on your guges and 250psig on your high side ,it may very a little depending on how old the unit is and how clean it was kept through the years ,if your high side is reading 250 psig on the outer scale and your low side is reading45 to 50 psig on the white scale then the evaporator coil on your furnace is dirty and need to be cleaned.restricted air flow causes a low reading on the low side of your guages.i hope i was of some help to you

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