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RV Air Cond. Question

J

John T

Well-known Member
Okay, let me tell you here at Hoover Dam and the Nevada Desert region where its been 110 and 112 degress the RV's Rooftop AC has a hard job extracting the heat inside, transferring it to the outside, and replacing it with cooler air grrrrrrrr

Sooooooo, RV's have those rooftop vents ya know

QUESTION with the AC running is it better to OPEN or CLOSE those rooftop vents?????

We all know hot air rises so if theyre open maybe the hot air escapes out them butttttttt is that sorta like trying to cool the RV with the windows open???

Roof vents open or closed?????????

I have my own non educated guess/opinion, hopin theres some HVAC experienced gents here who can provide the correct answer......

In a couple weeks I'll be at higher elevation in the Rocky Mtns with warm days and cool nights which is great for extended dry (no hookups) camping but in the meantime its freakin hot here

John T
 
John, Leave 'em closed! If you have them open, all your doing is bringing in more hot air which is being pulled into the return of the roof top mounted A.C.. With them closed, (which is the way the unit is designed to be operated) your not introducing any more "load" to the conditioned space. Your recirculating the air thru the unit which has already been somewhat cooled and dehumidified. Make sense? Been in the HVAC field 25+ years. Hope this answers your question. Tom
 
Can you find some shade for the RV? Maybe some tarps or other outside to keep sunlight from coming in and provide shade??
 
If you've been gone all day and it is hotter inside then out, open them. Once the air conditioner gets going then close them.

Think of your car after you return from the mall or restaurant and it's sooo hootttt. You put the windows down for some relief until the air gets to cooling then the windows go up.
 
I am going to agree with and second the notion of opening them for a short while if you have had the AC off and the RV is very warm, but once the initial heat is released go ahead and close them back up.

Whatever you do, enjoy the time away and find somebody to pick and grin with.

Kirk
 
They are closed now and will stay that way AFTER the initial cool down when I enter if after its sat a long time. I think its a tad low on R22 Freon which some dude is gonna check this morning...

Headed to Zion then Bryce Canyon

John T On the Road
 
Hey John - The A/C in my good old F250 diesel had not been keeping the cab as cool as I like this spring. However adding a mere 4 oz of F134A into the system got it working like new. (My wife complains "it's too cold" less than 5 minutes into a ride now...!)

Have a great (and cool) rest of your trip!

Bob M
 
I always left mine closed. NOW where are the pictures from this trip. Sure hope we see some soon or when you get home. Have a safe trip and enjoy the rest of your vacation.
 
(quoted from post at 20:47:44 06/18/12) Okay, let me tell you here at Hoover Dam and the Nevada Desert region where its been 110 and 112 degress the RV's Rooftop AC has a hard job extracting the heat inside, transferring it to the outside, and replacing it with cooler air grrrrrrrr

Sooooooo, RV's have those rooftop vents ya know

QUESTION with the AC running is it better to OPEN or CLOSE those rooftop vents?????

We all know hot air rises so if theyre open maybe the hot air escapes out them butttttttt is that sorta like trying to cool the RV with the windows open???

Roof vents open or closed?????????

I have my own non educated guess/opinion, hopin theres some HVAC experienced gents here who can provide the correct answer......

In a couple weeks I'll be at higher elevation in the Rocky Mtns with warm days and cool nights which is great for extended dry (no hookups) camping but in the meantime its freakin hot here

John T
Click to expand...


At 110 the rv does not have enough insulation and has way too many windows, so the a/c will be strained during the day and barely catch up by morn...

leave the units running all day if possible to keep the unit down in the high 80s... If you have to shut it down, leave a window open and the vents open to keep the heat down.
 
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