I'm doing some upgrades (SWCG, new lights) and the installer keeps telling me I should upgrade to a VS pump. I have a single speed 2 HP Hayward pump that works fine and am replacing the motor as it is getting loud (happens every 5-6 years). I have a simple pool with no water features and the pump runs a few hours a day to circulate and operate the Hayward Pool Vac. I did the math and it would take years to recoup the cost of the pump in electricity savings, not to mention that I don't even know when I would run the pump at anything less than full speed. Am I missing something?