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Old 04-01-2012, 04:36 PM   #1
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Which A/C is most efficent?

Should I use my dash engine-compressor a/c or run my generator and overhead a/c's? (40' Newmar MH with 350 ICS Cummins) We can be comfortable either way.
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Old 04-01-2012, 04:41 PM   #2
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We use our overhead AC unit while on the road. In my opinion, its preference. The generator uses gas to run, however the dash A/C uses it as well. We prefer the comfort of the roof A/C and keeping the coach cool.
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Old 04-01-2012, 04:42 PM   #3
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My guess would be a toss up. We use our generator. It cools the whole MH.
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Old 04-01-2012, 04:46 PM   #4
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our rule of thumb is if the outside temps are above 85 and we are driving into the sun, i run the genny and use the big a/cs to keep us cool

if its a drive into the shade and its 85 or below i use the dash unit.

HOWEVER,
if we have more than the dw and I riding along, its both a/cs on and the genny running


you just sort of have to let your level comfort desired be your guide.
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Old 04-01-2012, 06:52 PM   #5
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Should I use my dash engine-compressor a/c or run my generator and overhead a/c's? (40' Newmar MH with 350 ICS Cummins) We can be comfortable either way.
If the dash a/c keeps you cool enough, then it's a no-brainer when it comes to fuel consumption. The generator will consume more fuel than the dash a/c.
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Old 04-01-2012, 07:33 PM   #6
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A bit warm we use the dash air, if it's hot, we use roof airs. It's not a matter of which is more "efficient" but how hot it is.
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Old 04-01-2012, 07:42 PM   #7
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We run the dash A/C as long as possible which is most of the time. When it gets really hot we supplement it with the coach A/C run by the generator.
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Old 04-01-2012, 07:47 PM   #8
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If the dash a/c keeps you cool enough, then it's a no-brainer when it comes to fuel consumption. The generator will consume more fuel than the dash a/c.
I thought it's the other way around..... read that on iRV2 a while ago.
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Old 04-01-2012, 10:24 PM   #9
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Some of it depends on your Motorhome configuration. Mine has a side radiator and if the dash AC is selected, the hydraulic fan defaults to full speed. This costs nearly 1 MPG on average which is more than 1 gallon/hour. Your generator will probably use 1/2 to 3/4 gallon/hour. The generator needs exercise anyway.

Have a nice day - Darrel
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Old 04-01-2012, 10:40 PM   #10
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If the dash a/c keeps you cool enough, then it's a no-brainer when it comes to fuel consumption. The generator will consume more fuel than the dash a/c.
Not according to the pundits at some magazines. Our generator at full load only burns .72 GPH, that's hardly noticeable in the schema of things
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Old 04-02-2012, 12:00 AM   #11
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If you are going through Nevada in July and it's 110 degrees the question is mute.
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Old 04-02-2012, 12:21 PM   #12
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30 amp vs. 50 amp

I have a 34' Winnebago Adventurer with 2 AC's. I can run 1 unit when plugged into 30 amp shore line or both ac's when running my generator. Can I adapt my 30 amp plug to a 50 amp plug and plug into 50 amp shore power without causing any damage? This would allow mw to run both ac units when plugged into shore power, would it not?
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Old 04-02-2012, 12:25 PM   #13
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I have a 34' Winnebago Adventurer with 2 AC's. I can run 1 unit when plugged into 30 amp shore line or both ac's when running my generator. Can I adapt my 30 amp plug to a 50 amp plug and plug into 50 amp shore power without causing any damage? This would allow mw to run both ac units when plugged into shore power, would it not?
You should still only be getting 30 amps of power. If you add a "dogbone" to connect your 30 amp coach to a 50 amp power supply, your coach can still only handle the 30 amps and therefore will just take on that much.
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Old 04-02-2012, 04:50 PM   #14
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I often see this discussion and this I will tell you.. I remain firmly unconvinced, Pick a side, I remain firmly unconvinced.

This I do know... When I am driving the dash air (Engine powered) does a fairly good job of cooling the cockpit, but next to notihng for the "Rest of the house"

By the same token, the roof air concitioners, do a fantastic job on "The rest of the house" and dang near nothing for the cockpit.

Class A, 38 foot. (The problem in the cockpit is that it's a greenhouse, or rather a hot house when ye-old-sun is beating down on it. Oh well, at least the south side of the motor home is more reflective today.. Tomorrow.... I wax the north side.
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