I'll agree with you there. I am sure most of us worry about keeping things spot on all the time. For me I don't like seeing 5 or 6 degree variation in hot spot temps during one short period. It feels wrong. Temperature changes are gradual not quick and sadly I see fast changes odd dynamics of my place. But day to day morning to night large changes. I object that I cannot control the temp as much as the change. It is why after two weeks of my first snake I changed to internal and ever since. No variation at all. I can choose to change it or ramp it but I choose not my draft old wall. I am the keeper, I balance heat and humidity, not the environment I live in.