The timer would be pointless. If the heat lamp is shining in the same area as the uth is located the tstat would cut the power to the uth when the lamp is on because the spot would be warmed to the tstat setting. Then at night when the lamp cuts off the tstat would boost the uth to again create the correct temp. Keep it as simple as possible so you have less things that can break or go wrong. A timer would just be a waste and I can't imagine it would be good to be cutting the power to any tstat repeatedly.
The Herstat is a good choice. I just ordered the 4, I'm excited!
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