I live here. I had a 15000 in my Toy hauler, and it struggled to keep up if I was in the sun. It did a good job but not when it was 105 degrees. In the trees it was a lot better.
2012 Super Crew 4WD 6.7 PSD
2015 Cardinal 3800 FL
2007 Road King Black Cherry-Hers
2007 Road King Blue-Mine
1979 FXS Hot Rod Shovelhead