This is why we've decided to stay with our highly insulated brand of 5er rather than switch to a MH.
We have 2 AC's, 15k & 13.5k. With the addition of table fans, insulated dual cell shades and lined curtains, we managed to live in San Antonio through all of last July, then we moved to Augusta, GA's high humidity and 100 degrees in the full sun for the rest of the summer. I can keep the 5er 22 degs cooler than the outside temp.
While in SA, we had both AC's serviced by a Mobile Tech and they worked even better. He called it boiling and show DH the before and after photos. Small price to pay for comfort since I'm home all day while DH is at work.