Rooftop AC Unit Not Cooling Well

Thanks for the feedback. Sounds like it may be worth getting an estimate to see about getting the rooftop unit repaired. No sense in buying a portable if it won't do the job. Do regular HVAC companies work on these type of units or is it best to try and find a mobile tech for RV's/travel trailers specifically?

I just watched a video on cleaning and maintaining rooftop units. I am going to clean it and see if it will help it to cool better. I have no idea if a dirty unit could cause it to not blow as cold, but I figure it couldn't hurt to try.