All ActivityMost RecentMost LikesSolutionsRe: Air conditioning problemDue Therms Delta T range is 18-25 degrees. If you're getting below that there is a problem. The best you can expect with 80 degrees at your return air is + or - 55 degrees at your supply. If your like me and live in a coach with a 30 amp system, I can only run one 13500 unit at a time. My roof and AC's are white. Our AC unit will keep us cool in 100 degrees here in Florida, but it runs non stop and requires regular maintenance.Re: Intellitec 00-00591-200 Master Control Unit (heat-a/c) probI'm an RV tech here in Florida not far from you. I'm dealing with a master controller issue right now in our Fleetwood Pace Arrow, and it is the same one you have. I've been checking voltage and ohms for hours now and I'm sure the controller needs to be replaced. I'm going to go ahead and replace my ECC thermostat as well since it's also pretty old. Let me know if you need a mobile tech, I have fresh experience in this area unfortunately lol.