Thor Forums

[Chance]

Originally Posted by MJC62

My neighbor the a/c guy says best way to gauge the A/C performance take the temp at the outlet nearest the unit. A well functioning unit should be kicking out around 25* or more below the outside ambient temperature. So far this summer we have not gotten anything over mid 80*'s in NW Indiana. Our 15000 btu unit has been consistently 53* at the nearest outlet to the unit. BSexton hit the nail on the head get the unit cold and keep it that way.

Comparing outlet temperature to outside ambient temperature can be misleading because the outlet temperature is also a function of how much cooling capacity you have compared to requirement, not just whether the A/C is working correctly.

The normal way to get a quick read on performance is to compare outlet temperature to the return temperature, which is essentially the temperature inside the RV. So a 55 F outlet temperature in an RV that is 80 F gives 25 F cooling, even if outside is 95 F.



For what it’s worth, 95 F outside ambient is standard temperature for A/C capacity rating, but these rooftop units are also rated to cool in desert conditions which are much hotter outside. If one installs enough cooling capacity, the motorhome will cool down even on a 100 F day while parked in the sun. It’s just too expensive to mass produce motorhomes with that much cooling when very few will need that extreme, and rarely at that.