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Old 07-21-2021, 12:25 PM   #1
hirdo
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Join Date: Jul 2021
Location: Big Bear Lake
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Air conditioning ducts in Xlite 28sgs

We have a 2017 Xlite 28sgs. It only has 2 air conditioning vents in the main room that has opposing slide outs. That just doesn't seem like enough for such a large area and really has a tough time cooling when it is really hot. Anyone have any suggestions of how to add additional vents? Or other suggestions or opinions? We have a 15btu unit.
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Old 07-21-2021, 05:21 PM   #2
mikec557
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Quote:
Originally Posted by hirdo View Post
We have a 2017 Xlite 28sgs. It only has 2 air conditioning vents in the main room that has opposing slide outs. That just doesn't seem like enough for such a large area and really has a tough time cooling when it is really hot. Anyone have any suggestions of how to add additional vents? Or other suggestions or opinions? We have a 15btu unit.
Have you inspected, and retaped, all your air conditioning ductwork? If not it's definitely worth checking out. Pop off the grills on all your air ducts, not just the two in the living room. Inspect the foil tape and make sure there are no gaps allowing cold air to blow into the attic. Next, remove the ceiling grill on the air conditioner and inspect the foil tape on the duct work. Tape over all the air gaps you find. Finally, if you have a ceiling vent that is pre-wired for a second air conditioner (maybe in the bedroom), remove the beauty ring and look for foil tape. If found, remove it and verify that the foam ductwork behind it is sealed by foil tape to prevent cold air blowing into your attic space. I'll post a couple pictures to show you the kind of gap mine had. Half my cold air was blowing into the attic.

One picture shows a smoothly taped hole at the vent pre-wired for AC. I peeled that off and look at how cold air blows out of the duct and into the attic.

One round one shows the hole in the foam air duct and the hole in the ceiling luan. You need to tape the gap completely closed. See the other two round pics.

I had horrible factory taping (read: huge holes) on both sides of the air conditioner plenum, and huge holes on both sides of our vent in the bedroom. The four ceiling vents did not have holes, but the oem foil tape was just gobbed on. I peeled all of that off and retaped all 4.

We get noticeably more cold air blowing into the RV. A big roll of aluminum foil tape at the hardware store was $10. Ask for the HVAC tape.
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Old 07-21-2021, 05:58 PM   #3
Northofu1
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Have you opened the dump vent on the front of the AC until that area cools?
Have you taken the vents off and sealed the ends with tape? I switched to this style vent.

https://www.amazon.ca/Valterra-A10-3...6916376&sr=8-6

Have you done the same behind the main AC face plate?
The following video is a little labour intensive but cheaper than an RV FLOW system which I will post a link to.

Keep in mind, this is his 13K ducted bedroom AC. Your vent in your bedroom is most likely wired for a future 2nd unit.
The next link is a mod for your AC and is also a lot cheaper than the RV Airflow system.

there are many more videos, some are painful, some are to the point.
https://rvairflow.com/
Good Luck
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Old 07-21-2021, 07:34 PM   #4
hirdo
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Location: Big Bear Lake
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Thanks for the feedback! I have installed new vents, taped them up and also did some taping around the main faceplate. I really like the video by SaltyEscape and think I will give it try. Thanks again!
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