Running exhaust fan 27/7 vs intermittently

Hey fellas just wondering how you guys run your air intake/exhaust in your tent. I am in a basement that is about 68f in the day and 62f at night, so keeping my tent around 70 isn’t an issue with lights on, but it gets difficult to do as the heat from the light is gone and I’m pulling cold air in through the vent holes.

I am using passive airflow so no intake fan and was wondering if I could just crank the inline fan every now and then and give my tent environment time to stabilize to the plants liking, instead of constantly matching my basement. Would this screw the fresh air up?

Your theory will work fine as long as you are in veg. It will lead to increased humidity levels, which again, in veg, is fine. You do need to periodically exhaust/exchange the air though.

During flowering, you are going to want to keep it running 24/7, otherwise your humidity will explode. Especially when your lights go out. You can’t retain the heat without retaining all the moisture, and that would be problematic.

I grow in similar conditions as you. I typically need to run a heater during lights off at a minimum. In winter, I often have to run the heater during lights on too. Good luck.

I've done it a long time ago, using a segmented timer like you would for the lighting rig.....each switch on the dial represents 15mins so you can alternate each little swich 50/50 or whatever to correspond to light/dark periods.

I just run an extractor 24/7 now though, as it helps my humidity, but also its always passivley pulling in 'fresh' air, so it keeps CO2 levels up/consistent.

Just to clarify, I was runing my extractor all the time with lights on, but in periods of lights off, I had each little switch on the fan timer alternating for that 12hr period... so when it was 'night time' for the plant, the extractor would run for 15mins, and then cut off for 15mins, and then run again for 15 mins, etc..

But you have to be carefull doing that as your humidity might spike up high... you may vary, as always it just depends so you have to keep a close eye on humidity