I have a grow room in the attic. I need a space heater to keep night temp around 70 to 75. Growing hydroponics. Heater tripped over night when light was off. Temp could have gotten down to 50 degrees or lower. I dont know how cold and for how long. Im in the second week of flowering. Resovoir also got very low. When I checked on them the leaves had drooped. Did the cold cause this or the low water level or both. Will this kill the plants.
I am not a hydroponics expert, but from what I understand you should be allright. 50 degrees for a night or two isn't that bad. They are probably drooping from lack of water. Night temperatures should be a little cooler anyway. Good luck!