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I also use the TC-3, I’ve noticed they aren’t exactly perfectly calibrated, or maybe the block itself heats up from the amount of power draw for my 1.5kW electric heater, so mine turns on around 36°F or 35°F, and turns off quickly (sometimes at 37 or 38°F). This is actually preferable for me since I just want to keep my greenhouse above freezing while minimizing heating costs. So far it’s been very reliable, even if not wonderfully calibrated.
Here’s a chart showing a couple nights where the heat was triggered by the TC-3 (it’s been very rare this fall/winter, mostly it’s been warmer than 40°F in there):
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Make and Model. I don’t know. It is in the greenhouse and inaccessible now.
