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Old 06-28-2013, 06:42 PM   #1
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Lets talk AC again

What will a 12,000 BTU window unit do for me if its in the back window of the bus?
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Old 06-28-2013, 07:03 PM   #2
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Re: Lets talk AC again

Quote:
Originally Posted by opus
What will a 12,000 BTU window unit do for me if its in the back window of the bus?
well I would say you have a couple of things guaranteed...
If you power it up it will:
A. Make a lovely humming sound
B. Produce cold air.

I wish I could tell you how much and how well it will cool your bus but I am really lost on AC's and btu's. I have 2 AC's that I think are rated at 35000 btu each.... I can keep it quite comfy inside with full sun on bus. It does cool down fast. I have seen the RV roof units are usually around 12K, so it would seem this is a good size. Then you have the small window units 5-6K which fellow skoolie's are reporting differing levels of comfort and success with. I would like to see reports like:
Full sun@100f, inside 80f with 1 8k btu
partial shade@100f, inside 75f with 2 5k btu
Or something of that nature so that we can collect enough data to make better cooling decisions.

Looking at an online calculator it said 250sqft no insulation sunny room would need 14k btu. I don't know what temp they are figuring on though.
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Old 06-28-2013, 07:20 PM   #3
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Re: Lets talk AC again

Well, that helped. No, wait....no, it didnt help. LOL!

Not interested in roof mounts period.
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Old 06-28-2013, 08:06 PM   #4
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Re: Lets talk AC again

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Originally Posted by opus
Well, that helped. No, wait....no, it didnt help. LOL!

Not interested in roof mounts period.
Yes I wasn't attempting to be helpful answering your question as I am asking the same ones myself. I also wasn't advocating roof units...I have not read anything that makes me think they are worthy of the time, effort or expense. I was simply saying that they seem to be 12Kish which leads me to think that 12K would be a good number. As to the AC I have they are not roof mounts... they have inside air handlers and skirt mounted condensers, and I know very little about them even.
I am simply asking for info posted in a manner that we can examine for patterns and see if we could all come to a conclusion that works. Lorna posted in her thread that her 2 ac's manage 83-86 (i think) @ 109 outside with shade. This is info we can use, I know for a fact that anything over 74 is uncomfortable to me. In fact I prefer it at 68, but that would be cold by other people's standards . So for me to say 12K keeps me comfy means little to you. I am just hoping with this thread we can get some real numbers and info for you and the rest of us.
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Old 06-28-2013, 08:24 PM   #5
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Re: Lets talk AC again

I knew you werent trying to be helpful. 68 is perfect for me. Anything over 75 and I hide in the house.

We need AC about 5 days a year so I am not wanting to get carried away, hence the idea of it in the back window. I just added the roof mount in there incase someone was to suggest them. I think the only way to get anything about ac is to do it yourself. So, thats what I am fixin to do. Can I borrow your credit card?
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Old 06-28-2013, 08:33 PM   #6
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Re: Lets talk AC again

5050btu will make the back 12 feet(sealed off) a meat locker with factory roof, black windows and the sidewalls I did.
this is 90* with 90% humidity plus last weekend 65* is what back room probably averaged(with infrared hand gun....why do people just have to see what temp female boobs are?)

the front unit still needs some work....hopefully this weekend

then I have another (or 2 window units) should be cold with lower amp pull than root units...we shall see

the humidity is kicking our azzzzz's
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Old 06-28-2013, 09:01 PM   #7
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Re: Lets talk AC again

Quote:
Originally Posted by bansil
(with infrared hand gun....why do people just have to see what temp female boobs are?)
Well duh, keeping statistics is very important.
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Old 06-28-2013, 09:04 PM   #8
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Re: Lets talk AC again

Quote:
Originally Posted by opus
Quote:
Originally Posted by bansil
(with infrared hand gun....why do people just have to see what temp female boobs are?)
Well duh, keeping statistics is very important.
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Old 06-28-2013, 09:43 PM   #9
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Re: Lets talk AC again

Quote:
Originally Posted by bansil
5050btu will make the back 12 feet(sealed off) a meat locker with factory roof, black windows and the sidewalls I did.
this is 90* with 90% humidity plus last weekend 65* is what back room probably averaged(with infrared hand gun....why do people just have to see what temp female boobs are?)

the front unit still needs some work....hopefully this weekend

then I have another (or 2 window units) should be cold with lower amp pull than root units...we shall see

the humidity is kicking our azzzzz's
Showoff! Rub your "cool" temps in why don't you! Thank God it's going to cool down to the 90's next week.

Good rule of thumb... AC units will drop your temps by 10F to 20Fdegrees. Sometimes as much as 23 degrees. But no matter how well you have insulated you bus, it's still poorly insulated. I figure you need to reduce the square footage the AC is supposed to cool by 25%-30%. Possibly more.

Altitude (I mean HIGH altitudes over 5K) lowers the ability for your AC to cool. But then it's usually pretty cool at those temps.

In a central NM valley...
Late afternoon gets pretty warm in our bus. Sun is shining in pretty good at that time. Otherwise with temps as high as 108F the interior is cooled down 23F degrees cooler. So that means it's holding at 85F with a temp swing of 5 degrees +/- between kick on/off (we do not have it blowing constantly). Today's high was 109F. Our bus is 40 ft. GE 5050 BTU in the rear, GE 6400 BTU in the front. When the rear unit dies (older unit) we will replace with another 6400 BTU (it has a remote control and a digital thermostat). In the mornings before it gets so sickeningly hot and in the evening when the sun has dropped below the trees (around 6:30), the units get it pretty cool. We've got another two months of this!

What helps: Avoid the direct sun. Shade is your friend. Glass magnifies the sun's rays so close your THERMAL curtains. Have a light coloured roof (we have Henry's SolarFlex roof coating on our roof to reflect the suns rays and to provide a thermal break between the exposed rivets on the exterior and the exterior heat/cold). Insulation with a radiant barrier. Break the thermal link. Every rivet/screw exposed to the exterior will pull the heat from outside into the next thermal conductor (like a metal frame), and it keeps going. Move to a part of the country where cooler temps prevail.

I would suggest that, like a generator, you buy as big a unit as you can afford and fit in the space you have. Based on measurement, I think the 8K BTU unit would have fit. But in our case we are trying to stay on a 30 amp hookup so we decided the 6400 BTU unit would supplement the 5050 BTU unit nicely. Our bus is split almost into equal halves. The part closest to the center (the bathroom where I do NOT want it freezing cold) stays fairly warm all the time as the rear AC unit really doesn't have the power to cool that much poorly insulated space. The front AC unit does cool all the way to the divider between the shower/bath area and the galley. All we have up right now is a fabric shower curtain to divide the front half from the back half. Amazing what that thin bit of material does. Eventually it will be replaced with an accordion door.
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Old 06-28-2013, 09:58 PM   #10
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Re: Lets talk AC again

FYI:

We bought at the Roswell Sam's Club GE AEH06LQ It was $155.98
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