Can't wait to see the result. I currently control all my pool equipment with my ISY994i but wanted to add a bit more intelligence when it comes to heating control. The thing about temperature settings is that a number is irrelevant as it is a hard number... yes the water temp is X. What would be cool is to develop some sort of algorithm that takes ambient temp into account and comes up with a (user confirmed) comfort setting. I know when I use the spa in winter - 100 can seem extreme but in summer the 100 might feel tepid. Right now I whip out my phone and turn the heater on and off remotely when it gets too hot or cold because the thermo is set to a hard number. Anxious to see how this pans out.