Forum Discussion

Dklonin's avatar
Dklonin
Explorer
May 21, 2017

New to RV lifestyle, need to know if this is normal

Greetings all!

I tried a search and didn't find a good answer to my question so I hope this is the right area.

I have a 2015 Keystone Sprinter 299RET. It has a 15k BTU AC unit and prepped for a second. Now I am actually a certified Universal HVAC tech (haven't touched an AC unit in 30 years though) and while I know how AC units work, I am not familiar with how they work in an RV.

Our unit isn't cooling the coach down. It's working and blowing cool air but before I go yelling at the service department or asking for a warranty replacement, I need to ask this question.

What is a reasonable coach temperature that can be expected on a 85 degree day, moderate humidity in direct sunlight?

I have had the unit running on 78 degree days and it's 74 inside with the unit running on high. Recently, it was 87 outside and 88 inside. The people with a similar size coach with one AC on the same day had their coach inside temp at 70. I suspect I have an air leak somewhere. I used a laser thermometer and found hot spots inside the air return prior to the evaporator. I think that is my issue. But what is a realistic temperature I can expect on my size coach with one AC on a warm summer day?

Thanks!

14 Replies

  • Whokares2 wrote:
    Get an ac thermometer and place it in the output vents of your unit, it should cool the air approximately 20 degrees from the outside temperature.
    The actual output temp will likely be around 50. That's what I measured in my coach, although there were plenty of HVAC technicians to tell me I didn't know what I was talking about. I'm not sure what an 'ac' thermometer is.

    It's the air temp of the coach that will be about 20F below ambient.
  • It could be that the divider between the hot air and the cool return has collapsed and is preventing the unit from doing its best.
  • Get an ac thermometer and place it in the output vents of your unit, it should cool the air approximately 20 degrees from the outside temperature.
  • Generally 20 degrees below ambient is considered normal. In direct sun it may not be able to do that.