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Old 07-17-2019, 03:27 PM   #1
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AC temps ?

What temps should the AC be blowing at the units ?
Does the temps of the AC units vary depedning on the air temps inside or outside ?

I'm going to pick up a thermometer to measure the temps on both of my air conditioners. Figure I will check them at the vents on the AC unit itself.

I'm wondering if I have a problem with my rear AC unit or if it is just too hot outside for it to cool down as much as I would like.

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Old 07-17-2019, 03:30 PM   #2
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The differential is measured from input air temp. Normally, output should be in the 20 degree +/_ range from that input air temp.

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Old 07-17-2019, 03:37 PM   #3
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+1 on the 20 degrees
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Old 07-17-2019, 03:43 PM   #4
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I think I remember reading somewhere that the temp differential is within "spec" according to Coleman at 16 degrees or greater delta over the coils.

Most people reference 20 degrees delta over the coils to be as good as it can get.

FWIW, I believe my problem with my front unit has to do with the area being cooled. The rear unit is the same size as the front, but it's handling about 1/3 the cubic area as the front unit. On top of that, the front unit has to fight the cab area, the door, and the huge windows over the couch and dinette.

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Old 07-17-2019, 04:07 PM   #5
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Spend some time and read through these posts:

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Old 07-17-2019, 05:18 PM   #6
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Dump the rear air directly into the room, not in the ducts. My rear air will freeze you out! But I donít know what year but Jayco went to a 13.5 btu rear air.
Buddy Brown

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Old 07-17-2019, 08:28 PM   #7
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I am on the OK, TX, NM, AZ phase of our long trip in our 31DS with only one AC. I was very concerned with cooling. In fact, the 15K BTU unit seems to be holding up well. We have had multiple 100 degree days and as long as we get the unit started, close up the window shades, it will eventually lower the inside temp from 99 to 80 over a couple of hours and maintain it.

In two days we transition to Bryce Canyon and lower temps....
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Old 07-18-2019, 07:38 AM   #8
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Thank you for the information !
I will do some air temp measuring at the intake and at the vent where the AC dumps out.

Our last older class A had two smaller AC units and would freeze us out. The Seneca has two larger units and will cool down but nowhere near freezing us out. Class A was even a little larger floor plan.

I also think the Seneca is not sealed as well as our older class A and that may contribute to it as well.

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Old 07-18-2019, 07:56 AM   #9
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You also might want to go check out this thread, it will give a bunch of tips on the ducting. It seems that quality control and A/C install are severely lacking at Jayco, the way they install ductwork and the divider between the air return and output.


Some simple clean-up has made a world of difference for some people here, depending on how sloppy the install was.

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Old 07-18-2019, 08:15 AM   #10
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Four months of ownership in our new 355 mid-bunk. We have the whisper quiet a/c and the front loud a/c 13,500. I complained to the dealership the big living room unit wasn't cooling like I thought it should. They said they checked it out and was working fine. Mid-afternoon here in Port Aransas, temps not going down, going up. Creeps up to 75, 76 but with the heat indices this week, I guess it's doing good. All vents have good cold air blowing. I shot a temp gun and they're blowing 44 degree air. Guess it's too hot outside and I have a large rig to cool down.

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