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Open Roads Forum  >  Class A Motorhomes  >  General Topics

 > Dual A/C's, but only 1 duct line

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dodge guy

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Posted: 04/22/19 12:43pm Link  |  Quote  |  Print  |  Notify Moderator

I’ve noticed this on other RV’s and expect it. I plan on running both when I have 50A service. And with mine the previous owner had a nice padded cover fabricated to replace the stock interior AC vent cover. This way you could have the AC on and not hear the drone of the AC above you!


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Posted: 04/22/19 01:32pm Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

I have NEVER seen a Ducted RV have 2 separate ducts. When you have just 1 AC running, you can run the other AC on FAN only to get cool air to the AC not running. Except for this post, I have never had anyone notice or complain about the One Duct system in 25 years. Doug


I wasn't complaining, but just didn't know this was common. I assumed the the 2nd a/c may had been added later, but it guess not. I never really paid much attention, and assumed that it was completely separate duct systems. But, this does make sense to run one and run the other unit on fan if on a 30amp site.


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Posted: 04/22/19 04:36pm Link  |  Quote  |  Print  |  Notify Moderator

We have two heat pumps on one duct system. We have dual zone controls and if the front is we get some good low in the rear and vice versa. We have sliding vanes on the five vents to adjust the flow.
If you don't have adjustable vents it is easy to change them out, if you can find them. I'm sure some Dealers catalog has them.

wa8yxm

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Posted: 04/22/19 07:21pm Link  |  Quote  |  Print  |  Notify Moderator

Yes it is very common for both units to share the same ducts.


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Posted: 04/22/19 09:41pm Link  |  Quote  |  Print  |  Notify Moderator

We like to run the front air when sleeping. This way we get the air through the duct to the bedroom but less noise.


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T18skyguy

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Posted: 04/22/19 09:59pm Link  |  Quote  |  Print  |  Notify Moderator

Same in my 2017 Greyhawk. Turning on the second AC just doubles the output volume in the single duct. But it doesn't do it exactly evenly. With a single AC, there is more resistance to flow the longer the duct is toward the non running AC. It's much the same in forced air heat/AC in our stick houses. The room farthest from the AC/Heat fan get's the least volume.


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 > Dual A/C's, but only 1 duct line
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