How cold is too cold?

Moflow said:

Yea, 12v fan is great for extraction in the cool tent, min air exchange. I use it all yr round, no problems.
The outside temperature has risen by 10 degrees C now the cold snap is over so the plants will love it!

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Well I made through the "squall" lol. I've been playing with my intake and exit temps. Currently my intake (just outside air) is coming in at 72 degrees. My exit temp is right at 70. Moved my heat emitter back above the ladies with the clip fan pushing the warmer air throughout the tent. My ambient temp at the lowest so far was 70, highest at 80 which is where my thermostat is set.