Hi Landmark,
Pool temp could very well be an issue in Houston.
I'm in Baton Rouge, and so far, keeping the temp "low enough" has been my biggest challenge. We finished our pool last August, and it quickly got up to 95-96 degrees... which WAS NOT comfortable at all. It's not good when your pool is warmer than the air!!... and yes it the air temp in BR drops below 95... sometimes... at night, anyway.
Thanks to this site, I was able to drop my temp to 90-92ish... don't remember the exact temp. For me, 90 seems about ideal... well... 88 might really be ideal on the 100 degree days. 90 seems nice though.
We simply started running the 2 deck jets that we had installed during our build... I run my pump during the day, with the deck jets running during that time. I was told that you will get the most cooling effect during the "driest" part of the day... of course, dry is a relative term... and probably varies every day for you and me.
If you got extra bucks, get you one of the nice looking units you're looking at... I was SERIOUSLY considering installing one last August. Who wants a pool that's too darn hot to swim in?? As for now, the jets seem to have solved mine. So far, this summer my pool is hanging at 89-92 degrees... which I can live with. (If it stayed at 92, I'd consider some sort of fountain, before spending $ on a powered unit.)
Sorry I can't offer any feedback on the Glacier machine... well, guess I'm glad I didn't have to buy one (yet.)
Hope this helps, and good luck with your build,
Steve