Good Sam Club Open Roads Forum: Class C Motorhomes: Keeping cool
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 > Keeping cool

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Bordercollie

Garden Grove, CA, USA

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Posted: 07/16/19 09:19pm Link  |  Quote  |  Print  |  Notify Moderator

That's pretty amazing, the engine driven AC compressor doesn't diminish gas mileage. OK, that's good to know.

JaxDad

Greater Toronto Area

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Posted: 07/17/19 06:06am Link  |  Quote  |  Print  |  Notify Moderator

Bordercollie wrote:

That's pretty amazing, the engine driven AC compressor doesn't diminish gas mileage. OK, that's good to know.


You were thinking the additional part-time (compressor cycles on & off) load of maybe 1.5 hp would have a significant effect on the fuel consumption of a 6.8 litre V10 that’s already pushing what is basically an 8’ x 8’ brick that weighs ~15k pounds at 60+ MPH?

AJR

Close to Madison Wisconsin

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Posted: 07/17/19 04:49pm Link  |  Quote  |  Print  |  Notify Moderator

I don’t know about all the above said. I do know in my two class Cs with only the engine AC working. The cab and the living space up to the kitchen area were cooled. Past that when I stopped I had to turn on the coach AC to get the bedroom cool also with the house AC. I do insulate the cab from the house when stopped.

When I had a class A I had to run the house AC on the road when driving into the sun. The chassis AC did not compare to the AC in a class C.

Just me experience with a gasser Class A.


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Happytraveler

Capistrano Beach, Ca. USA

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Posted: 07/17/19 05:23pm Link  |  Quote  |  Print  |  Notify Moderator

We have friends from Arizona that sold their motorhome and bought a truck and trailer because when they were on the road the motorhome never got cool inside with the dash air on. We said why didn't you turn your generator and air conditioner on when you are traveling. . They said they didn't know you could do that, LOL.


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JaxDad

Greater Toronto Area

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Posted: 07/17/19 05:46pm Link  |  Quote  |  Print  |  Notify Moderator

AJR wrote:

I don’t know about all the above said. I do know in my two class Cs with only the engine AC working. The cab and the living space up to the kitchen area were cooled. Past that when I stopped I had to turn on the coach AC to get the bedroom cool also with the house AC. I do insulate the cab from the house when stopped.

When I had a class A I had to run the house AC on the road when driving into the sun. The chassis AC did not compare to the AC in a class C.

Just me experience with a gasser Class A.


Which is EXACTLY why I was trying to share some knowledge.

The Ford E-Series A/C is incredibly powerful, but it’s ability to blow air around is severely lacking. It has a puny little 12 volt fan that just isn’t up to the task of moving enough air to cool a M/H.

However, using the above-noted method of opening the rearmost roof vent allows the vacuum to overcome what the fan can’t, getting cool air to the back and draw out the hot air back there at the roof level.

Some people however prefer to argue instead of learn, nothing new there.

pnichols

The Other California

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Posted: 07/17/19 07:39pm Link  |  Quote  |  Print  |  Notify Moderator

JaxDad wrote:

AJR wrote:

I don’t know about all the above said. I do know in my two class Cs with only the engine AC working. The cab and the living space up to the kitchen area were cooled. Past that when I stopped I had to turn on the coach AC to get the bedroom cool also with the house AC. I do insulate the cab from the house when stopped.

When I had a class A I had to run the house AC on the road when driving into the sun. The chassis AC did not compare to the AC in a class C.

Just me experience with a gasser Class A.


Which is EXACTLY why I was trying to share some knowledge.

The Ford E-Series A/C is incredibly powerful, but it’s ability to blow air around is severely lacking. It has a puny little 12 volt fan that just isn’t up to the task of moving enough air to cool a M/H.

However, using the above-noted method of opening the rearmost roof vent allows the vacuum to overcome what the fan can’t, getting cool air to the back and draw out the hot air back there at the roof level.

Some people however prefer to argue instead of learn, nothing new there.


That method will of course work if the dash A/C is NOT SET to recirculate -> so that new air from the outside can come in from the front via the A/C fan and replace the air that the vacuum at the rear is removing through the rear vent.

As I mentioned earlier, this method constantly carries outside air - with all of it's dust content - throughout the coach interior.


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Bordercollie

Garden Grove, CA, USA

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Posted: 07/18/19 09:56am Link  |  Quote  |  Print  |  Notify Moderator

I have read a number of interesting posts , on various forums and websites, on this subject. I intend to use my genset and roof AC more, with or without the dash AC, and with various settings of roof and dash AC/vent settings. I was merely interested in affects on mpg, out of curiosity. Increased usage of the genset and roof AC and dash AC is probably good for their seals, etc.

sprint99

Merton, WI

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Posted: 07/18/19 01:13pm Link  |  Quote  |  Print  |  Notify Moderator

Ran the Genny and Roof AC for the majority of our journey to and from Wisconsin and Maine. Kept the wife and sister inlaw cool and happy as well as allowing use of their chargers for phones and tablets. Usually not to adverse of an affect on the mileage that it bothers us as we'll also run them when we have our dogs with us.

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