I mean everybody is different. I have those fluker thermometer/hydrometer to measure, but I don't have it on a T-stat with a probe. I have $5 dimmer switchs from lowes, with a UTH on the bottom that stays on, and a heat lamp that I control the temp with. I had a BAH-1000 system but I honestly didn't like it, and I sold it on here. It fluxuated -3/+3 degrees of what you set it to, and the snake constantly would knock it down.