How many roof AC units do I need?

[86neoplan]

as most of you know, My little coach is only 26 foot long, and thats bumper to bumper...

I am trying to figure out how many roof airs I need.

Any suggestions?


shawn

[coachcrazy]

last year i rented a 28ft class C and it had one 15,000 btu  roof unit and that made the bus plenty cold.

[Ross]

I went with 3 roof units...15K each.  Basement was quite a bit more money and I didn't want to raise the roof.  If you go basement, you should plan on a roof raise to accomodate duct work.  This being my first, I wanted to keep it simple....and it still took 3 years to build.

[Dallas]

Cat and I saw a 45' Dutch Star last fall that had 6 roof airs on it.
Let's see, 45 divided by 6 = 7.5' per A/C
So using that we can surmise that 26 divided by 7.5 =3.4666666666666666666666666666667 A/C's.
So now we can round it up, since obviously the Dutch Star, being more expensive has better insulation 
We'll call it 4 roof airs.
That should allow you to keep the temperature about 34° in Death Valley in July.
It'll also help keep the beer a lot cooler so you don't have to work the fridge so hard.
Of course, you'l probably need 2 12.5 KW diesel gensets, but Hey, who's counting!

Dallas

[TomC]

Depending on if you're going to have an engine run dash air.  If so, one roof air would be enough.  If you don't have the dash air, then one in the middle and one near the front.  Good Luck, TomC

[FloridaCliff]

Depends!

If you are keeping all the glass you will probably want two to be safe.

There is a ton of cooling/heat loss when moving.

If on the other hand you are covering the bulk of the windows I would go with one 15K.

A 13.5 would freeze me out in my 27' Class C when not moving, but just not enough when moving, the 15K may do the trick if near the front.

Remember that the driver is in the discomfort zone with all that glass and hot/cold air on the front when your moving.

Best of Luck,

Cliff

[Danny]

As everything else, it would depend on what your plans are for the bus.  I do not like hot weather - so, I want to travel in temps that are more reasonable.  Considering this might help you make the call...

Danny

[plyonsMC9]

Hi there '86,

I had a class A, 34 foot.  Two roof airs.  Insulation was pretty good.  White roof.

We about had heat stroke in Blyth CA, when the temps passed 120 degrees.  Had both roof airs and the in-dash A/C going as well. 

Ever since then, I've been a big fan of more rather than less A/C units.  On our 40' bus, we have 3.  And I've never regretted having more a/c units.  If you aren't using it, then turn it off.     If you need it, it's there.

OK, that's my 2 cents.

Hope this helps - good luck with your decision.

Kind Regards, Phil

[tucsontattoo]

  Four!


                                 Tucson

[Danny]

I guess another way to put it is:

Depends on how hot is it outside and
How cold you want to be inside   

Danny

[Len Silva]

I'm just going to set the GPS for 72 degrees and not worry about the air conditioners

Len

[Dallas]

I'm just going to set the GPS for 72 degrees and not worry about the air conditioners

Len

Len,
Is that 72° altitude or rectitude?

Dallas