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Old 06-21-2016, 02:55 PM   #1
Weekend Camper
Join Date: Mar 2016
Location: arizona
Posts: 18
Adding a second AC

Good day good people. I have a 2017 ST320BH and I live in Arizona so pretty much I live in hell. That being said, the current AC is not adequate for cooling down even the living area. It is ducked through the RV so I was hoping to add one to the master bedroom and another to the bunkhouse. It is a 30 amp system. Thank you for any info.
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Old 06-21-2016, 03:34 PM   #2
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Join Date: Feb 2015
Location: SC
Posts: 659
As you explore this topic, you'll find several threads and internet stories. They seem to go in two directions. The "factory" solution is to upgrade your TT to a 50 amp service, complete with heavy wire, plug, bigger box, etc. Many have come up with an alternate solution, where the second AC is fed by it's own 20 amp line, it's own circuit breaker and box, and on to a separate line cord terminated by a "regular" 20 amp plug. It works at pedestals that have both a 30 amp socket and a 20 amp socket.
Marty and Martha
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Old 06-21-2016, 08:10 PM   #3
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Location: Texas
Posts: 1,508
I agree with Marty, the most practical solution is to wire the 2nd A/C as an independent 20 amp circuit. Most owners are able to snake the 120V AC wire from the roof vent thru the ceiling to a nearby closet and then down thru the floor or thru the exterior wall with a twist lock connector.

Adding a 3rd A/C will be much more work if you upgrade the main service from 30 amp to 50 amp. An alternative would be to make a sort of cheater box that plugs into the camp pedestal 50 amp outlet. The box has it's own 30 amp outlet for the RV cord to plug into and then another 20 amp outlet for the 3rd A/C. Each outlet would need it's own circuit breaker as well. In reality, I doubt a 3rd A/C would be needed.

Finally, I recommend the 2nd A/C should be a direct discharge model rather than tying it into the existing duct work. First off, the existing duct probably doesn't run all the way to the bedroom roof vent unless your unit was prewired for a 2nd A/C. But the biggest issue is the size of the duct and the number of ceiling vents may be insufficient for the increased air flow of 2 units (or 3 units ) running at the same time. Dometic requires a double 'H' pattern for the duct work and 8 ceiling vents. While my unit was prewired, it only had 5 vents and a single duct leg in the bedroom area. Also, there are likely some leaks, however small in the duct. Anyway, why add that 2nd and maybe 3rd cooling unit and have the blowers fighting each other to move air thru too little ducting/vents.
Larry Day

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Old 06-29-2016, 06:07 AM   #4
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Is the bunk room in a slide? If so this may be impossible or close to it. The bed room should not be to hard if you have an inside wall close to the vent. Need for the thermostat and fishing 120 wire .
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Old 06-29-2016, 01:24 PM   #5
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Location: Rockport, TX
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What size AC do you currently have? I would go with the extra 20 amp circuit. I would also add a 15K BTU AC.

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air conditioner

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