SKIPCAROL
COSBY,TN
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Any suggestions here? We're parked in the sun...100 outside and have 2 A/C's. What's more effective, having the roof vent (with or without fan) open so hot air on ceiling can escape or keep all vents closed?
Carol, Skip & Buddy the Mutt
2005 Four Winds Hurricane 32R
2008 Chevy HHR Toad
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fordsooperdooty
Southern California
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Joined: 08/13/2004
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Make a note of the temp and try it. Get the exhaust fans blowing out the hot air first, than shut them and run the A/C's on high.
But remember that the roof top A/C unit does not cool incoming air, it cools the air already INSIDE the RV.
Open the awning, park under shade trees, get some foil backed bubble wrap for the windows and roof vents at Home Depot and start up the A/C early in the morning when it's cooler also helps.
My posts shouldn't be taken for factual data. They are purely fictional, for entertainment purposes and should not be constituted as actually related to scientific, technical, engineering, legal, spiritual or practical advice. Amen. 
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Old-Biscuit
Across the USA
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Joined: 06/20/2009
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Vents open.......AC cooling inside air.......cooler air being pulled outside.
Didn't your Mom every yell......."Where you born in a barn"? 
2007 RAM 3500 QC LB SRW 5.9L CTD 48re 4:10 4K in bed 'quiet genny'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
Hit the Road Free & Clear April '07
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RoyF
Fayetteville Arkansas
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Just thinking out loud, but the air that is exhausted out the roof vents has to be replaced by what? The replacement air has to come from somewhere, and the somewhere has to be the outside. Maybe around the door, maybe the windows don't make complete seals. So the incoming air will be 100 degrees. So I think that you shouldn't run the exhaust fans.
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pulsar
Lewisville, NC
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Moved from Forum Technical Support.
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JayWalker2009
I'm not really a
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Keep the vents closed. Air that is hotter than what is already in the RV is going to come inside the vents.
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wilcamp
Belmont Co., OH
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Just had trouble with our AC freezing up after a couple hours. Service tech pointed out that these units cool, in part, by dehumidifying the inside air. This process may take a while, depending on the relative humidity of the interior/exterior air mass. He advised that all windows and roof vents need to be securely closed, so as not to allow in addidtional hot/humid air. All AC vents must remain completely open. Closing one, even partially, will impede the flow of cool air, and promote the freeze-up of the coils.
Wil, Tara, Nakeeta (Alaskan husky 6 yr.-old), and Keeko (Jack Russel/Chihuahua mix 3 yr.-old)
(Joey our 6-yr. old Jack Russel mix, passed over the Rainbow Bridge 12/19/09.)
2008 Jay Flight 24RKS; 2006 Chevy Suburban 1500 4X4 Z71
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jassrnj
Bath, PA
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It should be the same as your home. I would not run my home AC with windows open. Close all windows and vents.
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hallock5
Texas
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Make sure the sparrows and crows perching on your vents leave a tip..
2008 Jayco Eagle Superlite 28.5RLS
2002 Ford 4x4 SuperCab 7.3 (Jr International) Diesel
Sad to say, time to sell to a good home.
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AO_hitech
SF Bay Area
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Joined: 08/09/2004
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Technically it is most efficient to leave the vents open until the inside temp is equal to or lower than the outside temp. Practically it is just best to close everything first.
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