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Old 07-18-2015, 02:41 PM   #1
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Default Under Chassis Air Conditioner

I was reading through RT Campskunk's blog posts on his Roadtrek test model and he briefly hinted that the air conditioning unit was located underneath the chassis in the rear.

Is this type of unit something that currently exists as an aftermarket add-on or is this a "proprietary" Roadtrek innovation?
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Old 07-18-2015, 02:57 PM   #2
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Dometic offers products like that: Choices - Dometic

Either self contained under bunk units or split systems. Maybe they're using something like that.
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Old 07-18-2015, 03:46 PM   #3
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Dometic offers products like that: Choices - Dometic

Either self contained under bunk units or split systems. Maybe they're using something like that.
I assume most Class B manufacturers don't use units like that because of limited cargo space.
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Old 07-18-2015, 04:21 PM   #4
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roadtrek uses a product from Proair

some people besides campskunk and mike have it.

it is going to be an option in the future

ProAir
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Old 07-18-2015, 04:41 PM   #5
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I think the industry uses noisy rooftop systems rather than quiet split systems for the same reason they do most things: Because that's the way they've always done it. I am seriously considering a retrofit. Could end up with a very nice skylight over our bed.

A company called Big Rig Products in OK City sells new and "like new" systems for what are reputed to be a very good price:

Dometic Truck AC Units

I haven't called yet, but word on the Net is that you can buy a complete system for less than $1K. Installation looks straightforward. Tempting...
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Old 07-18-2015, 04:54 PM   #6
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Originally Posted by avanti View Post
I think the industry uses noisy rooftop systems rather than quiet split systems for the same reason they do most things: Because that's the way they've always done it. I am seriously considering a retrofit. Could end up with a very nice skylight over our bed.

A company called Big Rig Products in OK City sells new and "like new" systems for what are reputed to be a very good price:

Dometic Truck AC Units

I haven't called yet, but word on the Net is that you can buy a complete system for less than $1K. Installation looks straightforward. Tempting...

it says it's 120 volts. i would think the DC models would be better
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Old 07-18-2015, 05:06 PM   #7
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it says it's 120 volts. i would think the DC models would be better
I go back and forth on that. We have a large inverter, so it doesn't make a huge difference--a little efficiency lost. OTOH, a DC system would need pretty big cables. I wonder if there are performance or reliability differences? I know that the old Airstream Westys came with DC units that proved to be very troublesome--a lot of owners ended up converting to AC. Don't know if that generalizes, though.
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Old 07-18-2015, 05:44 PM   #8
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Quote:
Originally Posted by avanti View Post
I think the industry uses noisy rooftop systems rather than quiet split systems for the same reason they do most things: Because that's the way they've always done it. I am seriously considering a retrofit. Could end up with a very nice skylight over our bed.

A company called Big Rig Products in OK City sells new and "like new" systems for what are reputed to be a very good price:

Dometic Truck AC Units

I haven't called yet, but word on the Net is that you can buy a complete system for less than $1K. Installation looks straightforward. Tempting...
My thoughts exactly! Moving the air conditioner underneath leaves room for a skylight or more solar panels.
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Old 07-18-2015, 06:33 PM   #9
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The goal for my conversion is DC for as many components as possible. That includes A/C. I have an Autoclima Ugo, which is 12V, Danfoss compressor, compact stand alone unit that will go in a closet. Highest amp draw is 44. Autoclima and IndelB have rooftop, double capacity, and split units as well.
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Old 07-18-2015, 06:40 PM   #10
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I just went out and measured. The compressor/air-handler of the Dometic unit would easily fit in the far back corner of the upper rear cabinet of our Legend:

AC_loc.jpg

The space is more or less wasted back there anyway. We could duct vents downward on both sides. I would run the plumbing down the rear corner behind the upholstered wall. This would be sweet.

Only complication would be that I would probably need longer-than-normal hoses, since the place I would mount it underneath the vehicle is pretty far forward. Looks like a piece of cake otherwise. Hmmm...
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