Adding a 2nd AC unit

Unruly · 01-03-2017, 05:39 PM

Hello. I have been contemplating adding a second ac unit to our Sabre. The area for the front ac unit is already prewired and has a thermostat installed. I have checked with two different dealers about doing this work. Both dealers have stated that the unit would not be connected to the existing duct work and would just dump in to the bedroom. They stated that the units would work against each other. Is this how its normally done? I have seen other brands of RVs that both ac units are ducted but I am not sure if those ducts are connected to both ac units or run separately. Thanks for any input.....

MOD Guy · 01-03-2017, 05:57 PM

I have a friend with a Bounder Class a that came with 2 A/C units, bot run on the same duct system. I helped him add a 3rd unit in the bedroom. We tied it into the duct system in the center of the unit, 2 years with no problems.

tkmi · 01-03-2017, 06:07 PM

Quote:

Originally Posted by Unruly

Hello. I have been contemplating adding a second ac unit to our Sabre. The area for the front ac unit is already prewired and has a thermostat installed. I have checked with two different dealers about doing this work. Both dealers have stated that the unit would not be connected to the existing duct work and would just dump in to the bedroom. They stated that the units would work against each other. Is this how its normally done? I have seen other brands of RVs that both ac units are ducted but I am not sure if those ducts are connected to both ac units or run separately. Thanks for any input.....

I put in one in bedroom not duckted no thermostat they do not work agent each other don't believe that. Worked great will freeze you out.

Crusadernoob · 01-03-2017, 06:34 PM

We, I mean, I, would like to add a second A/C unit also, non ducted, in my pea sized brain I can't see two A/C units working "against" each other, they will both cool the RV????????

Unruly · 01-03-2017, 07:08 PM

ok let me clarify. what I am talking about them working against each other, dealer stating not me, is if they are connected together in the same duct system. I am wondering if other people with Sabre's have two ac units running on the same duct system or if one just dumps into the area where its installed out the big vent on the unit itself.... ty

Kenny kustom · 01-03-2017, 07:36 PM

Had one put in the bedroom in our sabre.

No thermostat, and not ducted.

I like it cold, and this way I don't freeze the little monsters.

Tiggerdad · 01-03-2017, 07:53 PM

We have a second non-ducted. Wife places a small fan on the floor at the door to blow cold air to the rest of camper. Noisy and can't sleep when it runs but having the second speeds cooling after stopping for the day. Other ducted AC almost always keeps it cool after cooling down.

Crusadernoob · 01-03-2017, 07:55 PM

Unruly, I understand what you're saying and I understand what your going to do, my point was why on earth would an RV manufacturer make provisions for a second A/C unit, but the dealers say don't do it, they must have been under aged, under payed, school kids that weren't capable of doing the job and taking your money. Our Crusader is pre wired for a second A/C, non ducted, I'm going to put one in SOON, I'm sure neither one of us will encounter problems as many others have done it. Good luck. Honestly, I'm beginning to trust people on this forum more than I trust dealers lately! Better advice from more knowledgeable people.

Unruly · 01-03-2017, 08:07 PM

Thank you everyone for your input, I guess I will have the second one installed and not ducted in to the existing duct work. I was just wondering if both ac units could be installed to the same duct work.....

Barstorm · 01-03-2017, 08:16 PM

Make sure your unit is rated for 50amps, or you will be blowing fuses.

MillerTime · 01-03-2017, 08:20 PM

Quote:

Originally Posted by Unruly

Thank you everyone for your input, I guess I will have the second one installed and not ducted in to the existing duct work. I was just wondering if both ac units could be installed to the same duct work.....

Yes they can.
We ordered or 2015 Sabre 36qbok with 2nd air from the factory. It is ducted to both units and works great.

Here in Oklahoma we have a lot of days above 90° and super high humidity, and the camper cools fine. Kids bunk room gets a little warm sometimes though.

Kenny kustom · 01-04-2017, 10:47 AM

Quote:

Originally Posted by Barstorm

Make sure your unit is rated for 50amps, or you will be blowing fuses.

The unit is 50 amp.
Wired for 2nd ac and washer/dryer.

dustman_stx · 01-04-2017, 10:58 AM

We have a 2nd A/C, non ducted in our bedroom. I replaced the bedroom and bathroom vents with vents that are adjustable so I can control the amount of ducted air those 2 rooms receive. I can force the ducted air into the living/kitchen and bunk rooms and use the 2nd A/C to cool just the master bedroom. Keep in mind that a certain amount of flow is necessary through the ducts to keep the A/C from freezing up, so you might have to add some vents in order to maintain flow. I just added one of the non adjustable factory vents to the duct in the living area.

youroo · 01-04-2017, 11:15 AM

Do a search for Turbs install/with pics on his Saber!

Youroo! !

Charles Allen · 01-04-2017, 02:15 PM

You should consider an Atwood Air Command unit. They are much quieter than other units, with a built in thermostat and variable speed fan. We installed one in our Crusader and love it.

MacDR · 01-04-2017, 04:45 PM

My Columbus has the second AC and is ducted... We use both when we first setup and after our unit cools down turn one off.. During the day just use the bedroom AC to maintain the temperature..We turn on the AC in the living space on at night and we shut off the bedroom AC

Were comfortable and it's a lot quieter..

pdqparalegal1 · 01-04-2017, 04:51 PM

Quote:

Originally Posted by Unruly

Thank you everyone for your input, I guess I will have the second one installed and not ducted in to the existing duct work. I was just wondering if both ac units could be installed to the same duct work.....

Not an engineer but it seems that the air dumped into a common area by both A/C will seek to escape the duct work at path of least resistance and cool the entire coach.

5picker · 01-04-2017, 04:54 PM

Quote:

Originally Posted by Unruly

Thank you everyone for your input, I guess I will have the second one installed and not ducted in to the existing duct work. I was just wondering if both ac units could be installed to the same duct work.....

Yes, they can.

TURBS · 01-04-2017, 04:55 PM

Quote:

Originally Posted by Crusadernoob

We, I mean, I, would like to add a second A/C unit also, non ducted, in my pea sized brain I can't see two A/C units working "against" each other, they will both cool the RV????????

They work just fine ducted together.

TURBS · 01-04-2017, 04:57 PM

Quote:

Originally Posted by Unruly

Thank you everyone for your input, I guess I will have the second one installed and not ducted in to the existing duct work. I was just wondering if both ac units could be installed to the same duct work.....

I'd go ducted.
Same a/c unit.
Different ceiling kit.
Your sabre is set up for ducted.

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