The AC system produced supply temps. At 57-60 degrees on the first floor
With a return temp. of 71 degrees. The second floor supply temp. is at 59 degrees with a return temp. of 72 degrees. I know there should be at least a 15 degree temp. difference from the supply to return. There was also an
Air leak at the HVAC unit in the attic at the unused condensation drains but
A cap was placed where the leak was so could that take care of the degree
Difference in the supply and return?

Quote:

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Originally Posted by mbridges

The AC system produced supply temps. at 57-60 degrees on the first floor
with a return temp. of 71 degrees. The second floor supply temp. is at 59 degrees with a return temp. of 72 degrees. I know there should be at least a 15 degree temp. difference from the supply to return. There was also an
air leak at the HVAC unit in the attic at the unused condensation drains but
a cap was placed where the leak was so could that take care of the degree
difference in the supply and return?

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... degree temp diff? Anything lower than this would be acceptable, especially on a second floor. This number is probably typical and is considered a ballpark to shoot for.

It was quoted by a home inspector. Could fixing the air leak help with the
temp. difference?

Quote:

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Originally Posted by mbridges

It was quoted by a home inspector. Could fixing the air leak help with the
temp. difference?

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... could go either way in some cases but in general closing any air leaks off when a closed system is in place (furnace, A/C, etc.) will help improve the efficiency and reduce the temp diff. A swamp cooler, on the other hand, needs air leaks else it will overwork.