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Old 11-16-2009, 09:47 PM   #1
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Join Date: Sep 2006
Posts: 704
Re: Why roof-top AC?

One word, simplicity...

Cut a 14" hole in the roof and drop it in... four corner bolts and you're done, plug it in and start cooling the entire bus. Those things are usually 13,500 BTU and the fan is designed to throw the air quite some distance. They can also be ducted instead of just a central blow system. Mine wasn't expensive either, I managed to find a "Donor" unit from an old travel trailer that blows really cold. I also used a small window A/C in the back. but the roof unit cooled the whole bus.

Also, when you roll down the hiway, you can use the roof unit while in motion powering it from an onboard Generator...comes in handy. These things are made exactly for that purpose, why reinvent the wheel?

You just might be a Redneck if...
...your motor home used to be a school bus!
...Your living room has a steering wheel!
...Your home has brake lights

1994 Jeep Grand Cherokee
1989 Thomas Diesel Pusher (Cat 3208/Freightliner)
Chesapeake, Virginia
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Old 11-16-2009, 10:01 PM   #2
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Join Date: May 2006
Location: mid Mo.
Posts: 241
Year: 1976
Coachwork: bluebird
Chassis: F33695
Engine: 427 chevy
Rated Cap: 84
Re: Why roof-top AC?

I built my air cond under the bus because the death to all RV's is roof leaks, no holes in the roof, no leaky. Also they cause resistance to forward motion, lower fuel economy. I can run my air cond while running down the highway too but the bus windows leak air so bad I don't think it would cool down (a reason to use real RV windows). Anyway while in motion we get so much air movement that you don't need air cond. sportyrick
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Old 11-16-2009, 11:13 PM   #3
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Join Date: Aug 2009
Location: Lakeland, Florida
Posts: 232
Year: 85
Coachwork: Blue Bird
Chassis: Ford
Engine: Gas
Rated Cap: 66
Re: Why roof-top AC?

I am using a roof unit. I was weighing the option of window units or portable AC's. But in the end, the cost of building mounting hardware made the difference. A roof unit cost a little more, but no building. I also wanted to duct mine to different rooms. I have owned many of the window units that are cheaper. They cool well enough, but the fans on them leave a lot to be desired. You wont be ducting air from a cheap window unit. You would need a bigger one. Finally, it is a definite positive to have the AC under the bus drawing shaded air, but air rises. If you are pumping air into your bus from an AC that doesn't have a ton of force in the fan, you are just gonna be cooling your feet. A roof unit cools from the top and lets the air drop down on you cooling the whole bus. Would suck to spend all that time building and installing AC under your bus only to find you have cold feet and a sweaty head
Im Johnny. I Bike For The Light. I love missions. I think students rock. I make my mark.
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Old 11-18-2009, 01:17 AM   #4
Bus Nut
Join Date: Mar 2009
Location: California, Just NorthEast of San Fransisco
Posts: 539
Re: Why roof-top AC?

There is another thing you can do. Get a fan, tilt it back so it points at the ceiling (or prop it up if you have too), it should suck the cooler air from the floor and blow it to the ceiling, and get the air to circulate more efficiently. Down side, it takes a bit more energy. Upside, you can cycle the AC off for half an hour and just use the fan, as the air takes awhile to become uncomfortable again.

...It sucks working in a big glass box that heats up faster than you can cool it down. Good thing we had that floor fan. Theater Box Office.
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Old 11-18-2009, 04:37 PM   #5
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Join Date: Aug 2006
Location: Illinois
Posts: 381
Re: Why roof-top AC?

You really need to check out Sportyrick's conversion... ... t.JPG.html ... r.JPG.html
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