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Old 06-15-2018, 05:07 PM   #1
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Would upgrading the AC be worth it?

Well. I am preparing for my next cross country trip. Last year, my only real issues was that it is harder than hell to keep Oliver (our 2014 Thor Siesta 24SA) cool.

I have a buddy that just built his own RV parking garage and insists that I order a new / different AC and we can pull it into his bay and replace mine. No issues with the work, just not sure what to get.

Has anyone upgraded their AC? I was thinking about a 15000 BTU Dometic Blizzard.

What happens right now?

Mine is a ducted system. I have three vents aft of the unit, one vent on the unit, and two vents forward of the unit.

If I close all of the vents and open only the two forward, I get minimal airflow, but some air flow. If I close all of forward plus the one on the unit, I get decent flow from the two above the bed. At night I can open the back two and the bed area is sleep-able. If I close all vent except the forward vents there is no way anyone could use the above cabin bunk. It probably stays hotter than outside.

However, during the day the RV will only stay about 10 degrees under outside temperature.

I have read that I should pull down all of the walls in the over head cabin and insulate. Apparently Thor does not believe in wasting money there for the comfort of the client.

Any thing else I should do? Would replacing the current AC help?

Any thoughts?

Chuck
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Old 06-15-2018, 06:25 PM   #2
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Search around a bit there are a few related very recent threads on this very subject.

On a similar vein: http://www.thorforums.com/forums/f2/...ion-12596.html
and here: 2nd A/C install complete
and here: Opinions on new air conditioner
here: A/C not cooling enough
here: air conditioner

just in a little search...
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Old 06-15-2018, 06:27 PM   #3
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it's no guarantee that a higher amp unit will necessarily make any big enough difference when you really need it, but it WILL require a larger input, larger amperage Breaker, and possibly could impact/limit the other things you can do while the unit is running, whether you are on generator or shore power.
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Old 06-15-2018, 07:00 PM   #4
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Since it would require the least amount of expense: I'm all for giving the insulation route, a try first!
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Old 06-15-2018, 07:01 PM   #5
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Quote:
Originally Posted by JamieGeek View Post
Search around a bit there are a few related very recent threads on this very subject.

On a similar vein: http://www.thorforums.com/forums/f2/...ion-12596.html
and here: 2nd A/C install complete
and here: Opinions on new air conditioner
here: A/C not cooling enough
here: air conditioner

just in a little search...


Thanks.

I had done the research and had already read these.

I should have been clearer in asking if anyone that had the same unit experienced the same issue. My Thor dealer made the comment that the issue with the front vents was that it was an engineering flaw. Other posts talked about adding vents. And another about having to upgrade to a 50 amp system.

I was looking more specifically for a Siesta 24.

Chuck
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Old 06-15-2018, 07:05 PM   #6
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Going from 13500 BTU to 15000 BTU will make only a marginal, if even noticeable difference. Your only talking 1500 BTU which in the AC world isn't much. I wound up putting a second and matching 13500 BTU AC/Heat Pump in front, which does make a difference.
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Old 06-15-2018, 07:08 PM   #7
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You mentioned adding a vent to the body of the AC??

While you were up in there with the cover off: did you make sure that airflow was going where it is supposed to?
You might be able to improve airflow, with some effective sealing techniques...
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Old 06-15-2018, 08:23 PM   #8
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Adding a circular vent directly under the discharge makes a world of difference. Itís cheap and easy. There are several threads and instructions on how to do it.
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Old 06-15-2018, 08:28 PM   #9
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I agree...



http://www.thorforums.com/forums/att...1&d=1529090865
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Old 06-15-2018, 09:13 PM   #10
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I saw that too. I am not sure it is something that I could do or want to do with mine.

Tried to add a pic of mine but without much luck. Here is a link to what mine looks like.

https://www.amazon.com/Dometic-31059...ct_top?ie=UTF8
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Old 06-16-2018, 03:35 AM   #11
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Originally Posted by Bob Denman View Post
You mentioned adding a vent to the body of the AC??



While you were up in there with the cover off: did you make sure that airflow was going where it is supposed to?

You might be able to improve airflow, with some effective sealing techniques...


I was very disappointed with the effectiveness of my single air conditioner and was about ready to tackle adding a second one. But I decided to check the airflow baffle first and found mine to be VERY out of place. I straightened it up and taped it in place with metal duct tape and it made an utterly astonishing difference. I ordered and will install the circular additional vent tomorrow. I think thatís about all I can do for the one unit. As the summer passes it should become clear if it was enough. At this point I think it might be!
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Old 06-16-2018, 11:54 AM   #12
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The other things you can do to use that unit most effectively is to purchase the pillows that fit onto the vent fan holes and I built a reflective cover out of cardboard, shelf liner paper and aluminum foil that fits inside the skylight of the bathroom. On a sunny day, a tremendous amount of heat came in from those two places. The last mod was a curtain that my wife made that stretches on a rod behind the seats. Coupled with reflective window inserts it kept a lot of heat from the front window. I also use that curtain when driving to create a smaller space for the dash A/C to cool. The curtain coupled with two 120v plastic fans mounted on the curtain tracks above the side windows plugged into a small inverter mounted under the dash between the seats, makes a big difference going down the road on a hot day.
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Old 06-16-2018, 01:13 PM   #13
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Regarding what ONeill said... Ron agrees Ö for years we have used the vent pillows in all 3 vents, including the bathroom. It decreases the heat markedly.
Our a/c up front from the chassis/motor seems to work well .. I know of several people who have put up a curtain behind the front seats to confine the cool air to the cab when going down the road.


Re the house a/c Ö our Axis came with the upgraded unit .. dumb luck !! It pushes a lot of air Ö In additiona, we have two small fans we use to the air around the living room and bedoom. It is amazing what a couple fans will do.


That's all we got !
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Old 06-17-2018, 12:41 PM   #14
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Adding a circular vent directly under the discharge makes a world of difference. Itís cheap and easy. There are several threads and instructions on how to do it.


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Old 06-19-2018, 04:06 AM   #15
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Circular AC Outlet

Added a circular outlet vent under the AC discharge in my Axis 25.2 today. 95 degrees outside with an interior temperature of 77. Was not able to achieve that much of a delta before the addition of the circular vent. More than pleased with the outcome.
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Old 06-19-2018, 12:49 PM   #16
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Originally Posted by kylecm View Post


.....cut....

Mine is a ducted system. I have three vents aft of the unit, one vent on the unit, and two vents forward of the unit.

If I close all of the vents and open only the two forward, I get minimal airflow, but some air flow. If I close all of forward plus the one on the unit, I get decent flow from the two above the bed. At night I can open the back two and the bed area is sleep-able. If I close all vent except the forward vents there is no way anyone could use the above cabin bunk. It probably stays hotter than outside.

However, during the day the RV will only stay about 10 degrees under outside temperature.

I have read that I should pull down all of the walls in the over head cabin and insulate. Apparently Thor does not believe in wasting money there for the comfort of the client.

Any thing else I should do? Would replacing the current AC help?

Any thoughts?

Chuck
Three thoughts:

Iíd first ask Thor why they donít offer a 15,000 BTU A/C as an option before seriously considering switching to a larger A/C unit. I suspect itís because your generator is of lower power rating than most motorhomes, and you ďmayĒ be introducing a new problem under certain conditions.

One of the highest heat loads on any motorhome is the windshield, particularly new Class Cs with large slanted windshields. If you want to reduce heat gain most effectively, an outside cover that goes over entire windshield is by far the most effective, specially when parked in sun. Interior curtains and shades donít stop heat from entering the RV, they convert sunlight to heat at curtain or shade. At that point hot air will rise and heat bed area over cab. The biggest drawback with the outside covers Iíve used over 20 years is that you canít see out of windshield once installed. However, we like the extra privacy so that issue isnít all bad. If the view out the front is nice, sometimes Iíll take it off during parts of day when not needed to block sun.

Lastly, from your description, it sounds like you may have an issue with duct to the front. Iíd check that out or have it checked. When you close the others to the back of MH, you should be getting significant airflow to front. You may have a blockage, or disconnected duct, or who knows. I doubt dealer is correct on it being an engineering flaw, at least not entirely or from duct size standpoint.
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Old 06-19-2018, 02:48 PM   #17
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ac issues

Hi
Before you spend a bunch of money, Double check and make sure your unit isnt just recycling the cool air. Look on the gemini/compass thread for this issue.

It won't take long just remove your filter/cover. Mine was literally cooling its self I put a partition in to separate inlet and outlet it made a huge difference
also partial blockage to vent system due to poor installation


Good luck

Kevin
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Old 06-19-2018, 09:21 PM   #18
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Originally Posted by ksgreene View Post
Hi

Before you spend a bunch of money, Double check and make sure your unit isnt just recycling the cool air. Look on the gemini/compass thread for this issue.



It won't take long just remove your filter/cover. Mine was literally cooling its self I put a partition in to separate inlet and outlet it made a huge difference

also partial blockage to vent system due to poor installation





Good luck



Kevin


Agree with this 110%. On mine there was a fiberboard baffle that is supposed to be vertical to separate the two air flows. But itís just a friction fit for some reason and mine had been displaced to nearly horizontal by the way the installer had routed the wiring. I straightened it up and sealed it in place with metal duct tape. The difference/improvement in the overall performance of the air conditioner is at least 100%. I went from planning to add a second unit to not planning to with 20 minutes of no cost work. I also added the round vent to the cover as in the photo on this thread but Iíve not yet tested its impact.
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Old 06-21-2018, 07:14 AM   #19
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Got a link for the round vent? I have been removing the cover completely to let the blast straight down rather than through the ducts during the day. And putting back up at night to cool the bedroom.
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Old 06-21-2018, 11:59 AM   #20
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Originally Posted by petefoss View Post
Got a link for the round vent? I have been removing the cover completely to let the blast straight down rather than through the ducts during the day. And putting back up at night to cool the bedroom.
The round vent is available from Amazon, Camping World, and many other sources. Remove the four screws holding the ceiling cover in place and then remove the cover. Mark a spot in the center of the cover under where the AC exhaust is. Use the vent as a pattern and draw a circle where the vent will mount. Drill a 3/8Ē pilot hole and use a jigsaw with a fine tooth blade to cut out the circle you drew, take your time and keep the blade on the line, the plastic cuts very easily. Use four 1/2Ē #6 stainless panhead screws to mount the round vent. Reinstall the inside ceiling cover. You can goof off and still do the install in 30 min easily.

Iíve done several of these vents and they do make a difference. I leave the ducted vents open and use the round vent to direct air where I want it.

Here is the link to the vent on Amazon:
https://www.amazon.com/dp/B0095TEFNA...ing=UTF8&psc=1

If the link doesnít work search for RV round air vent and then look for the vent made by JR Products.
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