Hi, Got our Infinity Sun Peak last October. We live in the middle of the Canadian prairies,sometimes this december and january it was down to -52c . It used approx 1000 kwh per month. However, as my wife says "being a usual man" i had not read/totally understood the Balboa instructions. So now that i do i put it in SL sleep mode when its really nasty for a week or so and otherwise put it into the EC mode and only into the ST standard mode on the days nice enough (-12c or better)to go for a soak. Will let you know in april how much power we used feb/mar.P.S.I cannot tell you strongly enough how much we love and enjoy this tub . For the price i dont think you can do better.