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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