Hello, I'm in the process of designing and choosing a PB to build my first pool. It will be a basic 15x30 concrete pool without a spa. From the research I've done online, it appears that a variable speed pump is the way to go, for both reliability and energy saving reasons. I've had 4 PB come out and all of them have said that unless I was going to include a spa or water features, that all I needed was a single speed and that I really wouldn't see any energy savings. Is the information online about variable speed pumps just hype or does it only apply to people with spas? What should the cost difference between a single speed and variable speed pump be? Thanks!