I have had of 2 of these units since i bought my fireplace insert (heat & glow) & cannot regulate the tempature beter than the following. If set at 74 deg. F it turns the gas on at 71 and does not turn off until 77. when set at 73 it operates from on at 71 and off at 73. the book with it say's when the change exceeds 1 deg.above or below setting. I'm very discusted!!!!!!!! To warm and two cold!!!