I have a remote temp sensor outside under my curb side slide and it was showing 96 degrees outside a little while ago. I was nice and cool inside so I decided to see what the air temp was coming out of my a/c's. I used a Klein Infrared Thermometer and my rear 15K a/c air was 63 degrees, while the air from my front 13.5K a/c was 62. The temp for both was measured right at the air grill. Most of the air for both is ducted, but I opened the grill just enough to get a little flow through and then measured the temp of the grill after it had time to cool down with the flowing air.I'm pleased.

You could also measure the return air temp. Should be about an 18 degree differential.

Since it's not possible to measure the temperature of air with an infrared thermometer you actually measured the duct plastic temperature most likely. This means the air itself was probably a little cooler that your measured temperature. Good job.

To determine the differential you measure the return air & output air. Not the outside temp. :)

Sounds about right and your ACs are functioning as designed. On really hot days it pays to start them early making it easier for them to keep up in the heat of the day.

RV air conditioners are suppose to reduce the temp about 20 degree. The temp differential has nothing to do with outside temperature - both intake/outflow are measured from the inside of the RV. You don't need anything fancy to measure the temp differential. Outside temp obviously has has a significant impact on interior temp but that varies from rig to rig based on insulation, shade, etc.

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BarneyS
Explorer III
Jul 16, 2016
Since the original question has been answered and the OP is a happy camper I am going to close this one.
Barney
edatlanta
Explorer
Jul 16, 2016
fla-gypsy wrote:
If you're comfortable they are working correctly

My thoughts exactly.
edatlanta
Explorer
Jul 16, 2016
TXiceman wrote:
Using an infrared sensor will not give a true air temperature. You will read the temperature on the metal or plastic in front of the sensor.

With the fan on high you should see a temperature difference of 18 to 20 degF between the inlet air and outlet air close to the unit.

Trying to relate the units performance to outside present too may variables and is pretty useless.

Ken

I said in my original post I measured the grill.
edatlanta
Explorer
Jul 16, 2016
filrupmark wrote:
I believe they are working fine.

So do I.
edatlanta
Explorer
Jul 16, 2016
ksg5000 wrote:
RV air conditioners are suppose to reduce the temp about 20 degree. The temp differential has nothing to do with outside temperature - both intake/outflow are measured from the inside of the RV. You don't need anything fancy to measure the temp differential. Outside temp obviously has has a significant impact on interior temp but that varies from rig to rig based on insulation, shade, etc.

As long as I'm comfortable I could care less about all of the calculations. I just posted some observed temps and I'm a Happy Camper.
edatlanta
Explorer
Jul 16, 2016
Sandia Man wrote:
Sounds about right and your ACs are functioning as designed. On really hot days it pays to start them early making it easier for them to keep up in the heat of the day.

I agree, but mine are on 24/7 since I full time. I do keep my rear air thermostat set 1 degree cooler during the day than the front a/c. Both units cycle on/off this way. If I have them set the same the front a/c runs continuously all day, but then the front of the trailer is facing SW with no shade.
edatlanta
Explorer
Jul 16, 2016
tvman44 wrote:
To determine the differential you measure the return air & output air. Not the outside temp. :)

I am most interested in how comfortable I am inside when it is hot outside. In this case it was 96. Differential? I don't care as long as I'm comfortable. I don't want to analyze this to death, I was just curious what the cooled air temp was. It was obviously cool enough and doing it's job nicely.
edatlanta
Explorer
Jul 16, 2016
sch911 wrote:
Since it's not possible to measure the temperature of air with an infrared thermometer you actually measured the duct plastic temperature most likely. This means the air itself was probably a little cooler that your measured temperature. Good job.

You are correct. I measured the plastic grill after I opened one of the vents slightly to allow some cooler air to pass by it.

I'm very happy with the performance.
TXiceman
Explorer II
Jul 16, 2016
Using an infrared sensor will not give a true air temperature. You will read the temperature on the metal or plastic in front of the sensor.

With the fan on high you should see a temperature difference of 18 to 20 degF between the inlet air and outlet air close to the unit.

Trying to relate the units performance to outside present too may variables and is pretty useless.

Ken
fla-gypsy
Explorer
Jul 15, 2016
If you're comfortable they are working correctly

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