We've always struggled with our A/C. For some reason, The compressor on our unit will stop. The fan keeps running so you think it's cooling, but notice that temp is creeping up. A quick check of the air coming out and it's not cool. We have to turn it off for several minutes and then it will work again. As stated above, check the delta between the return and supply grills. Should be at least 20 degrees.
Brian, Mary, kids, beagle - Moose, and mutt - Maggie.
2012 Greyhawk 31FS
2013 Ford Explorer Toad