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peterk 04-14-2009 08:20 PM

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.

beenthere 04-14-2009 08:34 PM

Are you talking heating or cooling.

biggles 04-15-2009 06:49 AM

18F split return/supply on the air handler,and 10F on the condenser in/and blowing up and out if the charge is right.

dac122 04-15-2009 06:52 AM

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.

peterk 04-16-2009 07:37 PM

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.

beenthere 04-17-2009 06:21 AM

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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