Measuring cool down temps

[twistedtails]

Thanks for the reply. I understand how you actually drop the temps.

My question was how do you measure the temps. Do you go based on what the t-stat says? Do you shoot the tub with a temp gun? How do you actually measure the temps to verify they are at the desired temp?

If you are placing your probe for the t-stat directly on the heat source (which I do), I would always zap the hot spot in the tub to make sure my temps are where I want them to be. Just because your stat says 90 doesnt mean that it is actually 90 inside the tub. Your stat may say 95 in order to achieve a 90 hot spot in the tub so adjust accordingly. I have to run my stat at 90 to achieve an 88 hot spot in the tub. So when I drop my stat at night to 80 I get a 78 degree hot spot. In short, always take a temp reading where the hot spot inside the tub is. Hope this helps.