Friday, I run the generator to exercise it and ran the A/C's. When I was running just the front one, I noticed the air was barely coming out the rear ducts also, then vice versa when I ran just the rear unit. I stuck a flashlight in one of vents and discovered that what I observed was true.Is it common to have dual A/C's and for them to be connected to one set of duct lines? In the hot and humid summers in the south, the front seems to get a little warmer at times, especially with kids opening the door every 10 minutes. Would it be okay if I was to place some duct tape in the ducts to separate the ducts for each unit? If I keep all the front a/c air blowing in the front of the coach, I figured that may help more.Thanks!

We have the same situation in our 40'. We typically have only one AC on at a time. Night time we use the front one, and keep the front vents closed so it blows into the bedroom (quietly). Daytime we run the rear AC with the rear vents closed. Again, it is quiet in the front. Seems to work well for us. If it really gets warm, we can run both with what ever vents we need at the time.

larry cad wrote:We have the same situation in our 40'. We typically have only one AC on at a time. Night time we use the front one, and keep the front vents closed so it blows into the bedroom (quietly). Daytime we run the rear AC with the rear vents closed. Again, it is quiet in the front. Seems to work well for us. If it really gets warm, we can run both with what ever vents we need at the time.90% of the time, we always run both A/C's at one time. Never knowing noticing only 1 set of ducts.

Its a rv not a home they all run in the same duct work in a rv

Depending how you are parked in relation to the sun, particularly the west sun, I would not try to block any duct. If it is hot enough for a need for air conditioning I’d just run both. If it is like ours when the thermostat is satisfied it will shut down the appropriate unit. If really hot our rear unit could cool the bed room way down and the front one, running continuously could not quite keep up. We turned the bed room way down it and used a 9inch fan on the floor of the bed room and circulated air from the back to living area. Any way I’d run both and set the thermostat at the desired temp and leave it alone.

Cocky_Camper wrote:Friday, I run the generator to exercise it and ran the A/C's. When I was running just the front one, I noticed the air was barely coming out the rear ducts also, then vice versa when I ran just the rear unit. I stuck a flashlight in one of vents and discovered that what I observed was true.Is it common to have dual A/C's and for them to be connected to one set of duct lines? In the hot and humid summers in the south, the front seems to get a little warmer at times, especially with kids opening the door every 10 minutes. Would it be okay if I was to place some duct tape in the ducts to separate the ducts for each unit? If I keep all the front a/c air blowing in the front of the coach, I figured that may help more.Thanks!Yep, ours is set up the same way - 2 A/C units, one duct system.Al

Dual A/C's, but only 1 duct line | Good Sam Community

15 Replies

FloridaRosebud
Explorer
Apr 22, 2019
Cocky_Camper wrote:
Friday, I run the generator to exercise it and ran the A/C's. When I was running just the front one, I noticed the air was barely coming out the rear ducts also, then vice versa when I ran just the rear unit. I stuck a flashlight in one of vents and discovered that what I observed was true.

Is it common to have dual A/C's and for them to be connected to one set of duct lines? In the hot and humid summers in the south, the front seems to get a little warmer at times, especially with kids opening the door every 10 minutes. Would it be okay if I was to place some duct tape in the ducts to separate the ducts for each unit? If I keep all the front a/c air blowing in the front of the coach, I figured that may help more.

Thanks!

Yep, ours is set up the same way - 2 A/C units, one duct system.

Al
imgoin4it
Explorer
Apr 22, 2019
Depending how you are parked in relation to the sun, particularly the west sun, I would not try to block any duct. If it is hot enough for a need for air conditioning I’d just run both. If it is like ours when the thermostat is satisfied it will shut down the appropriate unit. If really hot our rear unit could cool the bed room way down and the front one, running continuously could not quite keep up. We turned the bed room way down it and used a 9inch fan on the floor of the bed room and circulated air from the back to living area. Any way I’d run both and set the thermostat at the desired temp and leave it alone.
newman_fulltime
Explorer II
Apr 22, 2019
Its a rv not a home they all run in the same duct work in a rv
Cocky_Camper
Explorer II
Apr 22, 2019
larry cad wrote:
We have the same situation in our 40'. We typically have only one AC on at a time. Night time we use the front one, and keep the front vents closed so it blows into the bedroom (quietly). Daytime we run the rear AC with the rear vents closed. Again, it is quiet in the front. Seems to work well for us. If it really gets warm, we can run both with what ever vents we need at the time.

90% of the time, we always run both A/C's at one time. Never knowing noticing only 1 set of ducts.
larry_cad
Explorer II
Apr 22, 2019
We have the same situation in our 40'. We typically have only one AC on at a time. Night time we use the front one, and keep the front vents closed so it blows into the bedroom (quietly). Daytime we run the rear AC with the rear vents closed. Again, it is quiet in the front. Seems to work well for us. If it really gets warm, we can run both with what ever vents we need at the time.

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Dual A/C's, but only 1 duct line

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