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 > A/C's and roof vents

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SKIPCAROL

COSBY,TN

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Posted: 06/21/12 01:22pm Link  |  Print  |  Notify Moderator

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?


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SooperDaddy

Southern California

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Posted: 06/21/12 01:27pm Link  |  Print  |  Notify Moderator

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.


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Old-Biscuit

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Posted: 06/21/12 01:44pm Link  |  Print  |  Notify Moderator

Vents open.......AC cooling inside air.......cooler air being pulled outside.


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RoyF

Fayetteville Arkansas

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Posted: 06/21/12 01:49pm Link  |  Print  |  Notify Moderator

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.

pulsar

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Posted: 06/21/12 02:47pm Link  |  Print  |  Notify Moderator

Moved from Forum Technical Support.

JayWalker2009

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Posted: 06/21/12 02:55pm Link  |  Print  |  Notify Moderator

Keep the vents closed. Air that is hotter than what is already in the RV is going to come inside the vents.

wilcamp

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Posted: 06/21/12 03:37pm Link  |  Print  |  Notify Moderator

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.


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jassrnj

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Posted: 06/21/12 03:50pm Link  |  Print  |  Notify Moderator

It should be the same as your home. I would not run my home AC with windows open. Close all windows and vents.

hallock5

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Posted: 06/21/12 04:06pm Link  |  Print  |  Notify Moderator

Make sure the sparrows and crows perching on your vents leave a tip..


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AO_hitech

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Posted: 06/21/12 04:14pm Link  |  Print  |  Notify Moderator

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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