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Old 03-11-2012, 06:44 PM   #1
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Converting 2nd A/C location to a ducted A/C

We purchased our fifthwheel in the fall, so we haven't had much chance to test out the air conditioners at this point. We know our last travel trailer really could have used a second A/C, so have full intentions of putting in a second unit on this coach. It has been wired for a second unit back there, but it is not ducted. It seems to me that the overall temperature of the entire coach would be improved, if both A/C's feed the duct system. As soon as I get a nice warm day, I plan to climb up on the roof and start working on the wiring for satellite dish (as discussed in this thread). It seems I would need something to link from that rear A/C location, to the thermostat. So that would be an ideal time to run a control wire, if I need to do that.

Just trying to do all my climbing around and running wires, in one shot. Is it worth it to make the modifications to duct the rear A/C? Should I just have it fire down into that bedroom?

Thanks in advance.
Justin.
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Old 03-11-2012, 08:26 PM   #2
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Most larger 5th wheels have the option of a 2nd a/c You should have a vent there. remove the inside trim and most are pre wired
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Old 03-11-2012, 08:32 PM   #3
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Quote:
Originally Posted by highcountry View Post
Most larger 5th wheels have the option of a 2nd a/c You should have a vent there. remove the inside trim and most are pre wired
Yes, it is. However, it is not ducted. I'm trying to decide if I should just slap a new A/C on the roof, plug it in, and call it good....or go through the effort of routing that opening to the duct (shouldn't be hard) and running a control wire to the thermostat (also shouldn't be hard). I've already located the wires for power, but there is nothing that goes back to the Thermostat.
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Old 03-11-2012, 08:50 PM   #4
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Originally Posted by TravelingJ View Post
Yes, it is. However, it is not ducted. I'm trying to decide if I should just slap a new A/C on the roof, plug it in, and call it good....or go through the effort of routing that opening to the duct (shouldn't be hard) and running a control wire to the thermostat (also shouldn't be hard). I've already located the wires for power, but there is nothing that goes back to the Thermostat.
I'm not sure I have the full picture. If you are talking about the rear a/c, you can probably reach the ducting and just hook in. If you just have 110 there then you are right, but if you have a wire harness you should have a 12v- and a 12v+ to the therm.
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Old 03-11-2012, 08:55 PM   #5
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I would advise first contacting the manufacturer and verify that the unit you're considering is designed to be connected to existing ductwork. Many add-on units are not intended to work into a pressurized duct and may experience problems (reduced capacity, freeze-ups, etc.) if installed in that fashion.
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