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Old 08-08-2017, 09:20 AM   #11
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Originally Posted by Bookemdanno View Post
I've got no ideas other than what you tried. I'm just hoping that this isn't what is to come when we head to Santa Rosa Beach, FL at the end of the month. Luckily, our spot is heavily wooded with a tree canopy. That should hopefully help a lot.

As a side note, we just got back from San Antonio and stayed at a hotel downtown. There is noway I'd want a wide open spot down there with the RV. It was hotter than Haddies down there!! I don't know how Camper Bob and several others even tolerate it??
We generally stay either inside or wet from about June to at least end of September. Best piece of advice? Find a swimming hole. Last year was a little more mild, but this year is shaping up to be a hot one down here. We got some rain this week, so that helps, but this weekend, we'll be up to 107. And that's just the temp, not the heat index. And even if there was a breeze, it's like standing in front of a hair drier.

As for keeping the rig cool, lots of good suggestions already: keep doors closed, keep blinds down, run fans to distribute air, keep awnings out as much as possible... I insulated the "cold" side our AC unit with Reflectix, and sealed the vents like was mentioned above, and that helps a little bit too. Run the AC cold early in the day to give it a head-start. It will probably be cold in the rig in the morning, but resist the urge to cut the AC off, and let it run. Also, try to cook outside as much as possible, but keep the door closed as much as possible too.

We tinted the windows in our S&B, and we have a roll leftover that I earmarked for the trailer. Our windows are tinted already, but I figure the film can't hurt; it's supposed to have "58% heat exclusion", so we'll see how that goes. I've also threatened to put Reflectix up over our windows on particularly hot days, but DW thinks it will look "too trashy" (even though after the factory tint and the stuff we'll add, you won't be able to see it).

Bottom line is it's a big box with not great insulation getting cooked in the sun, so it's going to be tough to keep it cool. Those of us who know what real heat is would never buy a claim to keep a trailer at 70 in 100 degree heat. Sorry, but that just ain't gonna happen with a large trailer, especially in full sun. So, like I said, find some shade and a swimming hole, drink plenty of cold water, and don't count on the trailer cooling down until later in the day...
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Old 08-08-2017, 10:29 AM   #12
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Originally Posted by rvhiker View Post
well, as philip henry sheridan said: "if i owned hell and texas i would rent out texas and live in hell."

and it's not even really hot here yet.
:rofl:
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Old 08-13-2017, 04:42 AM   #13
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Covers over the roof vents seem to help a little. Either the black or smoke ones.
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Old 08-13-2017, 05:27 AM   #14
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I have the unit in my sig and it came with the wisper quiet system. Although the unit is very quiet, the duct work is in the ceiling (Supply and return air). On a 90 degree day in the sun I'm sure the temp in the roof goes well over 100 degrees so in effect you are trying to cool the ceiling area. Add this to any air leaks in the ceiling and you probably have about 10,000 btu's of effective cooling in the living area. I'm looking into the possibility of installing a chill grill in the living room unit to direct the cool air directly into the living area. I can open it on really hot days and close it on cooler ones.
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Old 08-13-2017, 11:24 AM   #15
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Originally Posted by JohnWedell View Post
I have the unit in my sig and it came with the wisper quiet system. Although the unit is very quiet, the duct work is in the ceiling (Supply and return air). On a 90 degree day in the sun I'm sure the temp in the roof goes well over 100 degrees so in effect you are trying to cool the ceiling area. Add this to any air leaks in the ceiling and you probably have about 10,000 btu's of effective cooling in the living area. I'm looking into the possibility of installing a chill grill in the living room unit to direct the cool air directly into the living area. I can open it on really hot days and close it on cooler ones.
I think John is on to the answer...

on those hotter miserable days when it is hard to keep the motorhome cooled down, we open the vents on our units so that we bypass the ducts in the ceiling. This helps a lot. The Helix system is cooling the attic and ductwork first, then the camper.
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Old 08-13-2017, 11:47 AM   #16
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Before you add a chill grill, look into removing the vents and taping to ducts to the ceiling. It'll cost you less than $10 to buy the foil tape and 30 minutes of work. Try it! You'll thank me later


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Old 08-14-2017, 07:55 AM   #17
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Before you add a chill grill, look into removing the vents and taping to ducts to the ceiling. It'll cost you less than $10 to buy the foil tape and 30 minutes of work. Try it! You'll thank me later


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+1

If they still use the same vents they used to, they leak into the attic and inhibit air flow. The little sleeves that connect the actual vent in the ceiling to the duct stick up into the duct as much as an inch. They are also not a tight fit or sealed into the duct, so they leak cool air into the "attic".

I pulled all the vents down, removed the little sleeve, and used foil tape to create a small "duct" from the ceiling opening to the opening in the main duct. This creates more open flow in the duct, and seals the opening in the duct to the living space, thus eliminating any leakage into the "attic".

I also used foil tape to smooth out some of the "stuff" inside the hole to the main unit. There's all kinds of things in there from parts of the roof membrane to ducts not sealed tightly that will cause turbulence and air leakage. Smooth all that down and seal it up with foil tape, and it helps a little more.

I taped off and insulated the "cold" side of my unit on the roof too. I taped all the joints in that box with foil tape, and wrapped the box in Reflectix. Another little improvement.

If you do enough little stuff, it makes a difference. My system definitely works better now than when I bought it, and the cost was minimal other than time.
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