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Old 06-23-2015, 07:44 PM   #29
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Quote:
Originally Posted by dznf0g View Post

Outside temp CAN play into the equation, but not if the outside unit is appropriately sized to climate and home size.

Same with A/S.
Problem is unlike our homes where proper sizing takes into account your locale, insulation factor and windows, the air conditioner sizing for Airstreams is a one size fits all situation primarily dictated by the size of the trailer. What is proper sizing for one part of the country can be completely wrong for another. You size too big, you get short run times and a cool clammy trailer. Too small and its too warm. Unfortunately most folks don't take that into account when you buy an Airstream.

Also for those of you who have owned white or light colored trailers, most of us purchasing Airstreams have no idea of the heat absorption that aluminum provides. Yes an Airstream's roof is painted white, which helps. But there is a lot more of that body which is not and that's the rub. I learned on my first trip out at 104 degrees in full sun, how inadequate my air conditioner was and how my Safari with a patio awning only, needed a lot more shade, which I resolved later with a full length street side Zip Dee awning.

Most who buy their trailer off the dealer's lot are pretty much stuck with what the dealer ordered for their inventory. When I knew I was buying a new Classic back in late 2003, I made the decision to have one ordered in order to get the 15K heat pump model which was an option. At that time the Classic would have come with a 13.5K AC unit which would have been a major mistake.

So if you stay in the warmer climes, think carefully about your air conditioning needs and consider a higher BTU unit, or if necessary a second unit. If you are buying a model trailer with a patio awning only that will be used in hot climes, consider a street side awning with or in lieu of the larger air conditioning capacity.

Jack
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Old 06-23-2015, 08:16 PM   #30
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Yesterday in my 31' 72 Sovereign, stock Armstrong A/C I made a log of temperature as measured at the front of the cabin with the bathroom door shut. (Bathroom sacrificed to sauna)

Thermostat set on 74 degrees.

High interior temp measured at 78 degrees at 3:55 PM, exterior temp was 100 degrees.

At 5:30, inside temp was still 78, outside temp was 102.

By 6:45 the interior was 74, exterior still 102.

Direct sun matters a lot with these aluminum boxes.
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Old 06-24-2015, 09:14 AM   #31
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Ducted AC

I have observed that our 2015 Flying Cloud 30 with ducted AC remains much cooler parked in the sun than our 2005 Safari 28. The new trailers have a raised roof profile to make room for the AC ducting. This air gap provides a significant improvement in ceiling insulation. So this is another feature to be aware of. The ducted AC also cools the trailer better than before because a much better air distribution. It is because of the ducted AC that we decided to buy a 2015 Flying Cloud. We love the 30' floor plan too. The second AC unit really knocks the temperature down fast! Then, a single unit will keep things cool quite well. If we are sleeping, we run the middle unit only and and can barely hear it when it runs. This is a major improvement over the older style AC. When in milder conditions, I only use the 30 amp cord and one AC like before. So, dealing with the 50 amp cord isn't necessary most of the time traveling in the Western states.
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Old 06-24-2015, 10:52 AM   #32
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Ducted air- cooler/more efficient OR just quieter?

rp709
rp707, I'm curious as to whether your AC unit is larger than what came with your Safari? I noticed that my local dealer's 30 ft trailers have the 15,000 BTU units. In 2005 your Safari may have had a 13,500 BTU unit. That alone may be part of the betterment in cooling between your 2 trailers.

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Old 06-24-2015, 11:16 AM   #33
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I took the trailer to our storage facility this morning (Our Airstream dealer) and asked them to look into it. The first question I was asked was "How old is your friends trailer". Upon learning it is 8 years old he told me the refrigerant used in that vintage was far more efficient and could achieve those Ice Box like temperatures. The best we could expect was 15-20 degree differential from outside.
I have been reading through this thread and just had to comment on this dealers BS statement.

A 13,500 or a 15,000 btuh RV AC unit, properly operating, produces the rated cooling in btuh, totally independent of what refrigerant is used to do the cooling. One refrigerant is not "far more efficient" than another. If the unit is designed to produce, say, 13,500 btuh of cooling it will do that and btuh ratings don't change dependent on refrigerant.

Dealers statements like that one certainly don't help in understanding the issues involved. Any AC unit with the same rating will operate and remove that amount of heat, assuming it is working to specs.
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Old 06-24-2015, 11:29 AM   #34
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Idroba, you are absolutely correct. That reminds me of what the auto dealers used to spout when the refrigerant changed. Yes the refrigerant may not be as efficient, but the manufacturers overcame that obstacle by redesigning the hardware that the refrigerant runs through. So like you said a 13.5 k unit made 20 years ago should produce the same result as a new unit today. At one time those who had the old style refrigerant asked the question as to whether we could switch to the new. We were told no because of the efficiency difference of the refrigerant. But what they didn't tell us was the redesigned equipment overcame those differences.

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Old 06-24-2015, 12:00 PM   #35
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I've changed both of my Fantastic fans to MaxAir fans. They have a "ceiling fan" mode - the fans will run with the vent closed. I'm going to see if they help distribute the A/C air.
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Old 06-24-2015, 12:29 PM   #36
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So will your new Mercedes Benz

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2015 Airstreams have ducted air. The TR has a hump on top to accommodate the ducts. The hump is painted white to reflect sunlight / heat. A step in the right direction. Give AS some credit, had to be some engineering considerations. FYI, the hump will still get beat to pieces by a hail storm. Recently proven.
Hail beats up steel also
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Old 06-24-2015, 12:30 PM   #37
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Good luck, but I use a fan pointed to blow from back to front, sitting on the floor just about where the coldest air drops from the overhead unit. I find that it equalizes temperature very well and I doubt that a fan stirring up air on the ceiling would do as well forcing the cold air to the front of the trailer. It is a bit in the way when we are awake and moving around but it is just fine at night.

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Old 06-24-2015, 01:02 PM   #38
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I've changed both of my Fantastic fans to MaxAir fans. They have a "ceiling fan" mode - the fans will run with the vent closed. I'm going to see if they help distribute the A/C air.
Please let us know on that one.

Brian
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Old 06-25-2015, 09:26 AM   #39
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The Flying Cloud 30 comes with a 15k AC unit and the bedroom option is 13.5k. It would be a little tricky to compare the single unit performance with the Safari 28' 13.5k unit because the FC 30 is 3 feet longer. But, my guess is the result is nearly the same. So a single 15k unit in a FC 30 will be fairly close to the performance of a 13,5 unit in a Safari 28. Which, in my opinion, isn't very good AC performance. We are headed to Bishop, CA this weekend where forecast temperatures are over 100F. The dual unit setup will be outstanding in this situation, making less noise than the old single unit.
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Old 06-25-2015, 10:03 AM   #40
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Ac

Our 2015, 25ft w/one ac works great. At 95 degrees out side it only took 10 minutes to cool down. I was told that AS is coming out with a replacement cover for the air ducts so you can change the direction on which way the air goes, should be out soon.
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Old 06-25-2015, 10:16 AM   #41
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The new directional vents are out already. We got Lucy's retrofitted in JC in late April. They are a vast improvement over the OEM screens.

Brian
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Old 06-26-2015, 09:25 AM   #42
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Thanks, I will get some.
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