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Old 06-19-2017, 11:31 AM   #1
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Roof Top AC Units

Getting to the point in my conversion where I'm going to be piecing the interior together, One of my plans is to have 50amp service with 3 DUCTED low profile roof mounted Ac Units, My neighbor thinks thats overkill & that 2 will be more than sufficient, I've got 2in of insulation on the floor with 1 & 1/8" T&G subfloor & will have 2 & 7/8" of spray foam on the walls & ceiling. All windows have been removed & skinned over & I'm installing tinted RV Windows where needed.

Whats been the outcome of other members? 2 units wish you had gone with 3, 3 would have been happy with 2,Wish you'd never started in the first place?? what are your thoughts.
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Old 06-19-2017, 11:48 AM   #2
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I would put in 3 and here's why... unlike an oversized house system, with multiple units you can turn on as few or as many as you need for a particular situation...

you may find that at night once the bus is cooled down that 1 can maintain it.. but if you were out all day and had shut off the genny or were parked without shore-power.. then kick all 3 on and cool it down nice N quick...

you can still maintain humidity by turning off one or 2 if you are over- capacity..

those phoenix 120 degree days in summer if you happened to travel that way are gonna require more than you think to keep cool..
-Christopher
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Old 06-19-2017, 07:44 PM   #3
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I wonder. If you can afford 3, you may find that 2 does the trick most/all of the time... But having a third for backup or the couple of times a year that extreme temps show up (unless you have extremes all the time).

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Old 06-19-2017, 08:02 PM   #4
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Originally Posted by Njsurf73 View Post
I wonder. If you can afford 3, you may find that 2 does the trick most/all of the time... But having a third for backup or the couple of times a year that extreme temps show up (unless you have extremes all the time).

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I've seen higher priced S&S's running 5 Units, there will be times when we'll be in extreme areas plus humidity, As long as I'm able to take the edge off during the day I can cope but I need to be comfortable when I sleep. Since I'm going to be ducting I want to do it right the first time.
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Old 06-19-2017, 08:40 PM   #5
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I started out with one 15,00btu roof top AC. 1 inch styrofoam in the flor walls and 1/2" with the factory fiberglass in the ceiling. Parked and not driving one did pretty good in 90+ high humidity. Black bus, 4 rv windows. Eventually the 1/2 on the ceiling let loose from the wrong glue so I took it down. Ever since then it struggles with 1 AC in 90+ temps. I did add a second 13,500 rooftop and can run both off my old onan genny, while runnning down the road. Makes it pretty comfortable. Only running the one down the road at those temps gets pretty warm. I made the mistake of only doing a 30 amp shore power service and should have done 50 amp.. That will change soon in the next couple years. Long story short, go 3 and you won't regret it. It's easier to plan for 3 now, then to try and add another later.
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Old 06-20-2017, 12:46 PM   #6
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I sent a text to an old Air Force buddy who has a 40ft Class A with 2 AC units & he tells me he's happy with the two, spends most his time between Texas & Florida plus the bus is going to be far more insulated than his RV.
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Old 06-20-2017, 05:43 PM   #7
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I had two 13.5 BTU AC's in my 40' Newmar Dutch Star and always found them sufficient. I did avoid terribly high temperatures though. I'm planning two 15K units in my bus. If you plan to be 'in the heat' planning for three AC units seems like a wise choice.
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Old 06-20-2017, 05:48 PM   #8
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Quote:
Originally Posted by Stu & Filo. T View Post
I sent a text to an old Air Force buddy who has a 40ft Class A with 2 AC units & he tells me he's happy with the two, spends most his time between Texas & Florida plus the bus is going to be far more insulated than his RV.
Where are you sourcing them from?

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Old 06-20-2017, 06:40 PM   #9
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Where are you sourcing them from?

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Old 06-20-2017, 06:43 PM   #10
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camping world up here just had a big sale on A/C units.. im sure the sales are regional, but seems they advertise every few weeks in summer for having A/C units for sale.. maybe their prices are too high? their biggest gimmick now is the "get a brand new motorhome for $499 a month out the door 0 down..
-Christopher
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