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Old 07-08-2018, 09:41 PM   #1
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Mods on 355MBQS Mid-Bunk A/C ??

Have a 2018 Jayco 355MBQS. The Mid-Bunk room only has one A/C vent and its just inside the door from the hall. The room is much warmer than the rest of the RV. Tried using a fan in the room and helps but just moving the warm air thats in there. When both the Living room and bedroom A/C's are on there is more air pressure to that mid-bunk room but still is much warmer in that room. Anyone did any mods that helped? Any advise would be appreciated !!
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Old 07-08-2018, 10:04 PM   #2
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The NP 377 is the same way. When I removed all of the vents to tape them up, this vent was a direct duct taped to the vent. I wonder if the duct has a kink in it? At some point, I'll try to figure out where the feed originates from.
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Old 07-08-2018, 10:41 PM   #3
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There is a thread somewhere about putting a return air vent in the door. Apparently the added circulation helps greatly.
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Old 07-09-2018, 04:26 AM   #4
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Hi Ronnieb,


My daughter complains about the room being hot in my 2017, she usually turns the sofa into a bed and sleeps in the living room. I did one of the modifications listed here, https://www.jaycoowners.com/forums/f...lbh-49769.html You might try some of these. I'm not sure about the mod that NewBlackDak mentions, our door already has a 2" gap under it, can't believe that it needs much more air than that.
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Old 07-09-2018, 04:35 AM   #5
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Have you experimented closing a couple of the slide vents on the ac grill inside? It may provide more air flow to the ducts and give the mid rooms some additional flow.

We do that with both our units in really hot weather although we don't have any hot spots.
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Old 07-09-2018, 04:41 AM   #6
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Mods on 355MBQS Mid-Bunk A/C ??

Norty1,
The 355 doesnít have the unit exposed.

Iím wondering if something could be done with that huge vent under the desk to help circulation.

There may be something that can be done there.

I placed screen on the backside of mine to minimize the chance of creatures sneaking in. LOL
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Old 07-09-2018, 04:49 AM   #7
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Quote:
Originally Posted by Rckcrwlr View Post
Norty1,
The 355 doesn’t have the unit exposed.

I’m wondering if something could be done with that huge vent under the desk to help circulation.

There may be something that can be done there.

I placed screen on the backside of mine to minimize the chance of creatures sneaking in. LOL
Sorry, I am not familiar with that setup but from all I read, the ac problem is somewhat like the tires in a strange way. They supply just enough to get by when everything is normal. In hot days, when you need a little more, the system cannot provide it.

I read somewhere of a member putting an inline fan inside the duct to give the air a little more movement. I assume you are already running all fans ac fans on high. Mayde consider experiment with blocking some roof vents near the ac units?
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Old 07-09-2018, 09:18 AM   #8
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Our 2016 355MBQS is a little different layout, but these 2 changes helped greatly:
1. Seal the furnace return vent with a piece of vinyl and some velcro. This lets the heat from the basement directly into the bunk room. This is especially helpful if you have the basement open often. The outside heat will roll right into the room. Remember to uncover in winter months when the heater is needed.
2. Add a return vent higher up in the door/wall. Hot air rises. That 2" gap at the bottom of the door doesn't really help get air moving throughout the rig.


These 2 mods made the bunk room stay about the same temp as the rest of the rig. It does still take a little longer for initial cool down if we don't leave the door to the room open, but once cool, it is good to go.
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Old 08-07-2018, 10:07 PM   #9
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Cool

I have a 2018 355MBQS. I taped all the ducts in the unit. I removed the duct in the middle room, it had almost 16 inches of extra duct stuffed into the hole. I removed 15 inches and taped it back to the duct. It now blows very well. I also removed the grill under the desk and taped to the back of it some silver bubble wrap looking insulation I found at the big orange box store. It all helped but it still took all the first day to cool the unit down. I put 2 extra ducts in the kitchen/living area and now it cools much better. It dropped 12 degrees in a hour on a 93 degree day with no shade.
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Old 08-07-2018, 10:18 PM   #10
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Welcome to the forum.
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Old 07-18-2023, 04:06 PM   #11
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I can say without a doubt the mid-bunk that we thought we'd love we are not a fan of... It's oppressively hot in there, at least 10 degrees warmer than the rest of the rig once the afternoon sun sets in. Getting plenty of air flow from the single vent but it should have at least 2, if not 4. It's almost a joke to be honest it's so hot and the single vent is so completely worthless...
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Old 09-25-2023, 09:05 AM   #12
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Add a vent?

Hey y’all. I’m new to the forum. Doesn’t the plenum pass over the mid bunk room? Can’t you just add another vent in the ceiling?

My bad! I didn’t think that through. The loft is above it. Never mind.
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