dowoodward, first of all, welcome to Jayco Owners Forum. We invite you to go over to the New Members Forum and tell us a little about yourself. To your question, I do know that the a/c's will not turn your RV into a meat locker if it is really hot outside but if you get the interior cooled down early enough, they will do a pretty good job of keeping you cool, even on the hottest days. I learned this summer in the 100 degree Texas sun to turn the a/c on before it started getting uncomfortable, usually around 10am and let it start cooling the walls, furniture, etc. Cranking it up in mid-afternoon just doesn't give it enough time to cool things down. Also, a couple small box fans to circulate the air really makes a difference as well. Good luck.
2016 Chevy LTZ - Duramax/Allison
2008 Eagle 30.5BHS