TC Part 2: Does Temperature Control Make Sense?
So, we’ve already covered that TC is calculated rather than measured. Your mod calculates based on the wire in your build or coil head, and every wire type has its own temperature coefficient. As a physical value, this temperature coefficient changes with temperature. Once the pre-calculated value is reached, modern regulated mods simply reduce the heat. That helps protect your coil heads. In other words, temperature control can only help here, as it prevents your 
coil head or build from overheating.
With mechanical mods, you don’t have this electronic safety net, which is one of the reasons mech mods are always labelled: Only suitable for very experienced vapers who know exactly what they’re doing.
At least in theory, temperature control should help your coils last longer, because overheating is prevented. Many coils now have the recommended temperature range in degrees Celsius printed on them.
Temperature control and rebuildables?
So what if you build your own coils? Then you need to measure the resistance of your build and remember: the resistance has to be below one ohm, otherwise your mod will simply switch to wattage mode on its own. The cotton in your build must be completely dry for the TC test. Set it to 100°C and fire it – if nothing happens, everything is fine. Nothing should happen at 100°C. Now go up to 150°C and pull the cotton through a little further. If the cotton is still white, set it to 180°C – if the cotton suddenly starts showing brown spots, the temperature is set too high and you just need to dial it back. For actual vaping, though, you should rewick your build with fresh cotton.
You can find Part 1 on temperature control here.
