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Old 04-26-2016, 11:15 AM   #1
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A/C Output Temperature

Turned on the A/C this past weekend to check its operability. System came on and decent cold air blew out. The outside temp was 78 and the air coming through the unit was 63.5. I know on home units the air coming from the vents should be mid to upper 50s. Does the same hold true for RV A/C systems?
My only choice for service is CW and I would prefer not to go in blind with a "can you check my s/c system".
Thanks in advance.
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Old 04-26-2016, 11:30 AM   #2
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I was taught that output temp depends on many factors like humidity levels ect
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Old 04-29-2016, 11:27 AM   #3
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A/C Output Temperature

X 2 on hometool's response.

A better measure of performance is the delta T across the evaporator...... i.e. the difference between the air temp in the living space and the air coming out of the nearest outlet. On residential units, 20 degrees is pretty durn good; 15 degrees - marginal. A portion of the unit's capacity is spent "wringing out moisture" so humidity in the conditioned space will affect the numbers.

Your dash air is, of course a different animal. HUGE capacity .....often approaching 3 Tons (36,000 BTU per hr). Dash air temp on a good strong system is typically near 40 deg F....once the cabin is cooled down a bit.

In my new "retiree condo" digs, I have window units; a first for me. My IR gun shows about 15 + degrees delta temp.....shooting the evaporator coils thru the grill work. None of the 3 units ever quite make 20 degrees. And my GE units are fairly new.

Suggestion: Ck the coils (up on the roof) for reasonable cleanliness. [HD sells coil cleaner {safe for aluminum fins}]. If they are clean and the unit has always, always had a filter at the return air inlet; I'd wager your unit is working fine.

Just some data you may fine useful/interesting- The original buyer of my new-to-me 31 ft Class C ordered it with upgraded A/C (15,000 BTU option) and then the PO (2nd owner) had every window tinted with some sort of pricey "ceramic coat" tint system. The PO said cooling is very "adequate". I think most 30 footers with 1 A/C unit are pretty durn marginal though. I'll know a lot more this summer, of course. I am sure I am not gonna be too cold. :^)

Safe travels. ed s
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Old 04-29-2016, 12:03 PM   #4
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What they said. Put a thermometer where the air goes in, then where it comes out. At least in home AC units 20 degrees difference is gold. Humidity makes the system work harder so once you fire your AC up it may take a while to get maximum temp difference.

Of course if you have a ducted system like mine it can be difficult to get an accurate measurement where the air comes out of the coils.
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Old 04-29-2016, 12:26 PM   #5
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A 20 degree drop in temp. from ambient temp. is excellent.
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