I have gone digital and that is the problem. Set point 22, histeresis 1, lowest temp 20, highest temp 24 and actual temp 21. Read the instructions (a problem for us guys it seems) Cuts in less than set point and out at set point. Made in USA with instructions from Mongolia. I may have been dropped on my head as a baby but I would have thought that if you set it at 22 that is what you would get, not 21. However it works, it just helps to have Irish ancestry.