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Old 06-16-2016, 08:00 AM   #1
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Beat the heat - improve air flow from ceiling AC unit

I’ve always had a concern about the roof top AC unit. It seemed like it doesn't put out the quantity of air that it should.

Last week I was removing the AC unit in preparation for re-coating the roof. I looked carefully at how the air flow is routed, and wasn’t happy with what I seen.


With the ceiling cover off I ran the AC unit. The large squirrel cage blower delivers a lot of air, straight down, toward the floor. However, when the ceiling cover is installed, the air enters into the ceiling unit, and is restricted by abruptly 90 degree turn and a 2 inch restriction. the air then takes several more 90 degree turns before it exits out the vents on each end.


What the cover really needs is a vent opening just below the blower that allows the air to shoot straight down toward the floor, unrestricted.

See entire article with photos below.

Beat the heat – Improving air flow from the air conditioner ceiling unit | 2001 Coachmen Mirada 300QB

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Old 06-16-2016, 08:10 AM   #2
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Beat the heat - improve air flow from ceiling AC unit

My AC is already designed like this somewhat. It has a sliding louvres on the bottom so that I can open them to do a fast cooling of the main living area. Works great!
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Old 06-16-2016, 10:38 AM   #3
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Originally Posted by Aggie_90 View Post
My AC is already designed like this somewhat. It has a sliding louvres on the bottom so that I can open them to do a fast cooling of the main living area. Works great!
Same. Mine looks like this:



I've never seen a cover like the one shown in the article.

edit: No I take that back. I think my old pop-up had a cover similair to that.
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Old 06-16-2016, 05:21 PM   #4
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That looks like a stand alone unit, no duck work.
I have never had much luck with them. They can be loud
and they are on or off. Good Luck.
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Old 06-16-2016, 06:51 PM   #5
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there are quite a few different styles of AC's used in RV's all a bit different so what is one way for one person may not be the same for others . mine is ducted in which works great or i can open the dump for quick cool which i don't use very much at all .
the way any of these units gets installed with duct work can adversely effect the way they work
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Old 06-16-2016, 07:32 PM   #6
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Good job! The name of the game is getting as much cold air into the living area as quickly as possible without feeding it back into the air intake.
Looks like you've succeeded.
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Old 06-17-2016, 01:59 PM   #7
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Mine is like this. It IS ducted
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Old 06-17-2016, 02:09 PM   #8
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Originally Posted by whj77372 View Post
That looks like a stand alone unit, no duck work.
I have never had much luck with them. They can be loud
and they are on or off. Good Luck.
The pic that writecode posted us like ours. If you want to cool the main living area fast, leave that sliding gate open and it happens fast. If you want to disperse through ductwork to others areas, close it partially or completely. Our's flows a massive amount of air when you have it on direct but it's finitely slowed down when you are cooling through the duct work.
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Old 06-18-2016, 07:33 AM   #9
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I am guessing waiter21 has an older model with out the option to open vent ???
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Old 06-18-2016, 07:44 AM   #10
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Correct, my unit is an older model, circa 2001.

My original ceiling unit didn't have the straight down vents.

It appears from the postings that some of the new units have this feature.
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