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Old 08-06-2015, 03:17 PM   #1
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Coach a/c vs cab a/c

Just curious about this. I have read the thread on this stating that the cab a/c uses only .17 gallons more per hour at 2000 rpms, and that the Coach a/s users over .5. The test data in that thread is great, but I am not sure how accurate revving at 2000 rpms in park is. I think if you are driving at 50-55 at 2000 rpms, and are running the cab a/c, that number is going to be much higher due to the strain the a/c puts on the engine while it is trying to maintain coach speed.

I would have replied in there, but that thread is over a year old, and would not allow it. Has anyone else done any testing with this?
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Old 08-06-2015, 06:03 PM   #2
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If I had to worry about the difference between .17 and .5 gallons used per hour I would definately have to rethink owning an rv that gets 6 to 8 mpg on average.
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Old 08-06-2015, 07:23 PM   #3
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If I had to worry about the difference between .17 and .5 gallons used per hour I would definately have to rethink owning an rv that gets 6 to 8 mpg on average.
Grumpy
I agree. However, I some of the wealthy got wealthy by being smart and saving here and there. If something as simple as running one vs the other makes a difference, I would like to know about it. I personally just go for comfort and run the Coach and cabin a/c, but the thread I read got me interested.
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Old 08-06-2015, 08:11 PM   #4
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Difference at, lets say $3.00 per gallon, would be around .99 cents. Heck, you'd save more than that, over an hours driving time at 65 mph, by slowing to 64 mph.
Not even worth thinking about it.
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Old 08-06-2015, 08:32 PM   #5
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For me it is comfort and ease. At moderate temperatures the dash a/c cools enough for DW and myself. If passengers involved or temperatures get up to +95 then I go to generator for comfort.
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Old 08-06-2015, 08:42 PM   #6
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My cab ac will freeze you out of the cab area and I live where its hot but I'm not trying to cool the rest of the coach until about 30 minutes before I arrive so my wife can stay cool while setting up inside at the rv site or making lunch at rest stop never consider fuel


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Old 08-06-2015, 09:40 PM   #7
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It's not about the money for me. Just curious. I will have 5 people in the coach next trip so have no choice but to run the generator. I ran it last time, and that was my first trip. I do notice the difference in power when running the cab a/c though. I tried to avoid it, but even with the bunkhoise center folded up, I was still a little warm with just the coach a/c on.
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Old 08-06-2015, 09:56 PM   #8
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Can AC

I think I would run house ac if I was carrying more than a couple of people but my house ac never gets as cold as my cab does that's on s 3050s even when I run the house ac I run the cab ac to unless the rv is turned off
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Old 08-06-2015, 10:10 PM   #9
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I think I would run house ac if I was carrying more than a couple of people but my house ac never gets as cold as my cab does that's on s 3050s even when I run the house ac I run the cab ac to unless the rv is turned off
On my first trip, I have to agree. One is the same. Cab a/c feels really nice. Even with coach a/c blowing in the cab from bunkhouse, it's just not cool enough in the cab.
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Old 08-06-2015, 10:20 PM   #10
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Another thing to remember is do you really want the additional wear/tear of running the main engine that'll cost more to rebuild later down the road. I'd rather put those extra hours on the Onan and be confident the main engine will still get me on down the road. Easier to rebuild the Onan than say, the V10 in our case.
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