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Old 04-14-2009, 08:20 PM   #1
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Delta T


What should be the typical temperature difference between the intake and "exhaust" of a split system AC? How much does it depend on the intake temperature? I'm guessing that if the inlet is 40F vs 80F, delta T will be lower.

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Old 04-14-2009, 08:34 PM   #2
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Delta T


Are you talking heating or cooling.

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Old 04-15-2009, 06:49 AM   #3
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Delta T


18F split return/supply on the air handler,and 10F on the condenser in/and blowing up and out if the charge is right.
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Old 04-15-2009, 06:52 AM   #4
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Delta T


The proper terms are return (intake) and supply (exhaust) across which you measure delta T. And as been has suggested the numbers are different whether in heating or cooling mode.
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Old 04-16-2009, 07:37 PM   #5
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Delta T


I'm talking about cooling.

I recently bought my first home and the HVAC system is very very old. With a 65F return the delta T is only 9 degrees. I'm trying to decide weather to get it serviced and make it last however long it will last, or bite the bullet and get a sweet 16 SEER system and that fat government rebate.
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Old 04-17-2009, 06:21 AM   #6
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Delta T


9 is not much.
So it has a problem of some sort.

Weather its a diry coil, or low on charge or some other problem, can't say.

Depending on your location. You may be better off getting a new system. And upgrading to a heat pump.
The price difference is covered by the rebate. Plus you save some money on your heating bill every year then also.

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