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Old 08-19-2018, 03:47 PM   #1
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Ducted AC

Would it be possible to run duct work in the ceiling of a skoolie? I want to go with just 1-AC unit if possible. Doing solar so need some room up there..Also, i think its possible to run a rooftop ac unit off a genny while driving..am i correct in this?
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Old 08-19-2018, 04:32 PM   #2
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I'd suggest running the ductwork above the windows. Overhead room is precious on these beasties and very few people walk along the edges.
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Old 08-19-2018, 05:58 PM   #3
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On a full size bus one a/c unit is not going to be enough, not sure what size your bus is. Rv's can and do run the rooftop a/c off the genny while driving, so see no reason you can not do the same.

I have two 13,500 btu rooftop units on my 34ft bus. In the shade one will do just fine but out in the sun it needs both.
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Old 08-19-2018, 07:28 PM   #4
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Thats what I'm doing, I installed 2 ac units & started building ducts down each side of the bus about 2 ft off center of the ceiling, My plan is while sleeping if I need ac run the fwd unit & if I'm up front say watching tv,reading, run the back unit.I'm also making the ducts deep enough to where i'll have 1 in wire chases inside the ducts. I'm also thinking of running the ducts to the drivers compartment & have a flapper valve where I can close the ducts off & pipe cool air to the drivers compartment from the fwd unit, my neighbor keeps telling me it would be cheaper to put in dash air but I'm not so sure.
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Old 08-19-2018, 07:34 PM   #5
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Is the ductwork like dryer vent hose?
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Old 08-19-2018, 07:59 PM   #6
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Originally Posted by mikeypj View Post
Is the ductwork like dryer vent hose?
No I'm making it out of wood
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Old 08-19-2018, 09:04 PM   #7
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Although dryer vent hose might work, I think it will be more noise then something smooth .
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Old 08-20-2018, 06:07 AM   #8
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Quote:
Originally Posted by mikeypj View Post
Would it be possible to run duct work in the ceiling of a skoolie? I want to go with just 1-AC unit if possible. Doing solar so need some room up there..Also, i think its possible to run a rooftop ac unit off a genny while driving..am i correct in this?
Yes and yes.

As noted, however; ceiling height is the issue. My A/C ducting is not complete so completely unproven. That said, I've constructed a 3/4" tall space between the 'top' of the ceiling panels and 'bottom' of the roof insulation. It is very wide with cold air using half of the ceiling width and return air the other half. My hope is that the cold and return air will flow sufficiently well thru this space. The duct 'volume' math works out ok but that is no guarantee. In all, it's cost me about 1" of headroom.
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Old 08-20-2018, 06:34 AM   #9
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Quote:
Originally Posted by mikeypj View Post
Would it be possible to run duct work in the ceiling of a skoolie? I want to go with just 1-AC unit if possible. Doing solar so need some room up there..Also, i think its possible to run a rooftop ac unit off a genny while driving..am i correct in this?
Rooftop units are pretty darn inefficient. With a generator they're fine but with solar you'll want something more efficient.
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Old 08-20-2018, 08:17 AM   #10
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Not sure he meant running the a/c off solar, just wants room for solar. At least think that is what he means.

I would be curious if anyone has measured wattage on a rooftop and measured wattage on a mini split of the same btu rating to see how they compare?
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