I'm down in Cochise County and have a SWCG. As long as you over-size your SWCG, you'll be fine. Typically during the hottest part of the summer (though we're a little cooler than you), there's been times where I have had to run mine as high as 75% output, but that was to maintain 7ppm FC and big bather "load." I think you'll love the SWCG. No more pool-sitters needed for vacations, softer water, easier on the eyes, etc, etc. If like me, you'll be battling constant creeping pH, so be aware of that. Not a big deal, I add about 1.5 cups of acid per week (13,500 gal pool).